Fix on API response messages in device-mgt

Co-authored-by: Ravindu Madhubhashana <ravindu.kp@gmail.com>
Co-committed-by: Ravindu Madhubhashana <ravindu.kp@gmail.com>

components/application-mgt/io.entgra.application.mgt.core/src/main/java/io/entgra/application/mgt/core/impl/ApplicationManagerImpl.java

@@ -497,7 +497,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                     .getReleaseByPackages(Collections.singletonList(packageName), tenantId);
             if (!exitingPubAppReleases.isEmpty()){
                 String msg = "Public app release exists for package name " + packageName
-                        + ". Hence you can't add new public app for package name "
+                        + ". Hence you cannot add new public app for package name "
                         + packageName;
                 log.error(msg);
                 throw new BadRequestException(msg);
@@ -669,7 +669,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                     String extension = windowsInstallerName.substring(windowsInstallerName.lastIndexOf(".") + 1);
                     if (!extension.equalsIgnoreCase(Constants.MSI) &&
                             !extension.equalsIgnoreCase(Constants.APPX)) {
-                        String msg = "Application Type doesn't match with supporting application types of " +
+                        String msg = "Application Type does not match with supporting application types of " +
                                 deviceType + "platform which are APPX and MSI";
                         log.error(msg);
                         throw new BadRequestException(msg);
@@ -771,7 +771,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                         try {
                             ConnectionManagerUtil.getDBConnection();
                             if (this.applicationReleaseDAO.verifyReleaseExistenceByHash(md5OfApp, tenantId)) {
-                                String msg = "Same binary file is in the server. Hence you can't add same file into the "
+                                String msg = "Same binary file is in the server. Hence you cannot add same file into the "
                                         + "server. Device Type: " + deviceType + " and package name: " + packageName;
                                 log.error(msg);
                                 throw new BadRequestException(msg);
@@ -1175,7 +1175,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
         if (!hasUserRole(filteringUnrestrictedRoles, userName)) {
             String msg =
                     "At least one filtering role is not assigned for the user: " + userName + ". Hence user " + userName
-                            + " Can't filter applications by giving these unrestricted role list";
+                            + " Cannot filter applications by giving these unrestricted role list";
             log.error(msg);
             throw new BadRequestException(msg);
         }
@@ -1382,7 +1382,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             ConnectionManagerUtil.openDBConnection();
             ApplicationDTO applicationDTO = this.applicationDAO.getApplication(applicationId, tenantId);
             if (applicationDTO == null) {
-                String msg = "Couldn't find application for the application Id: " + applicationId;
+                String msg = "Could not find application for the application Id: " + applicationId;
                 log.error(msg);
                 throw new NotFoundException(msg);
             }
@@ -1494,7 +1494,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (ApplicationManagementDAOException e) {
-            String msg = "Error occured when getting, either application tags or application categories";
+            String msg = "Error occurred when getting, either application tags or application categories";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } finally {
@@ -1768,7 +1768,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             throw new ApplicationManagementException(msg, e);
         } catch (LifeCycleManagementDAOException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
-            String msg = "Error occured while deleting life-cycle state data of application releases of the application"
+            String msg = "Error occurred while deleting life-cycle state data of application releases of the application"
                     + " which has application ID: " + applicationDTO.getId();
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
@@ -1885,7 +1885,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                     throw new ApplicationManagementException(msg, e);
                 } catch (ApplicationManagementDAOException e) {
                     ConnectionManagerUtil.rollbackDBTransaction();
-                    String msg = "Error occurred while verifying whether application relase has an subscription or "
+                    String msg = "Error occurred while verifying whether application release has an subscription or "
                             + "not. Application release UUID: " + releaseUuid;
                     log.error(msg, e);
                     throw new ApplicationManagementException(msg, e);
@@ -1934,7 +1934,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             ConnectionManagerUtil.commitDBTransaction();
         } catch (DBConnectionException e) {
             String msg =
-                    "Error occured when getting DB connection to update image artifacts of the application release "
+                    "Error occurred when getting DB connection to update image artifacts of the application release "
                             + "which has  uuid " + uuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
@@ -1946,13 +1946,13 @@ public class ApplicationManagerImpl implements ApplicationManager {
         } catch (ApplicationManagementDAOException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
             String msg =
-                    "Error occured while getting application release data for updating image artifacts of the application release uuid "
+                    "Error occurred while getting application release data for updating image artifacts of the application release uuid "
                             + uuid + ".";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (ResourceManagementException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
-            String msg = "Error occured while updating image artifacts of the application release uuid " + uuid + ".";
+            String msg = "Error occurred while updating image artifacts of the application release uuid " + uuid + ".";
             log.error(msg, e);
             throw new ApplicationManagementException(msg , e);
         } finally {
@@ -1981,7 +1981,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                 throw new BadRequestException(msg);
             }
         } catch (DeviceManagementException e) {
-            String msg = "Error occured while getting supported device types in IoTS";
+            String msg = "Error occurred while getting supported device types in IoTS";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         }
@@ -2023,16 +2023,16 @@ public class ApplicationManagerImpl implements ApplicationManager {
             ConnectionManagerUtil.commitDBTransaction();
         } catch (ApplicationManagementDAOException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
-            String msg = "Error occured while getting/updating APPM DB for updating application Installer.";
+            String msg = "Error occurred while getting/updating APPM DB for updating application Installer.";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (TransactionManagementException e) {
-            String msg = "Error occured while starting the transaction to update application release artifact which has "
+            String msg = "Error occurred while starting the transaction to update application release artifact which has "
                     + "application uuid " + releaseUuid + ".";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (DBConnectionException e) {
-            String msg = "Error occured when getting DB connection to update application release artifact of the "
+            String msg = "Error occurred when getting DB connection to update application release artifact of the "
                     + "application release uuid " + releaseUuid + ".";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
@@ -2043,7 +2043,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             throw new ApplicationManagementException(msg, e);
         } catch (ResourceManagementException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
-            String msg = "Error occured when updating application installer.";
+            String msg = "Error occurred when updating application installer.";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } finally {
@@ -2241,7 +2241,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             throw new ApplicationManagementException(msg, e);
         } catch (ApplicationManagementDAOException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
-            String msg = "Error occured when getting existing categories or when inserting new application categories.";
+            String msg = "Error occurred when getting existing categories or when inserting new application categories.";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } finally {
@@ -2259,7 +2259,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             if (!deviceTypeName.equals(Constants.ALL)) {
                 DeviceType deviceType = deviceManagementProviderService.getDeviceType(deviceTypeName);
                 if (deviceType == null) {
-                    String msg = "Device type doesn't exist. Hence check the application name existence with valid "
+                    String msg = "Device type does not exist. Hence check the application name existence with valid "
                             + "device type name.";
                     log.error(msg);
                     throw new BadRequestException(msg);
@@ -2310,7 +2310,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                         .isExistingAppName(applicationUpdateWrapper.getName().trim(), applicationDTO.getDeviceTypeId(),
                                 tenantId)) {
                     String msg = "Already an application registered with same name " + applicationUpdateWrapper.getName()
-                            + ". Hence you can't update the application name from " + applicationDTO.getName() + " to "
+                            + ". Hence you cannot update the application name from " + applicationDTO.getName() + " to "
                             + applicationUpdateWrapper.getName();
                     log.error(msg);
                     throw new BadRequestException(msg);
@@ -2563,7 +2563,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                 applicationDAO.deleteApplicationTag(tag.getId(), applicationDTO.getId(), tenantId);
                 ConnectionManagerUtil.commitDBTransaction();
             } else {
-                String msg = "Tag " + tagName + " is not an application tag. Application ID: " + appId;
+                String msg = "Tag " + tagName + " is not an application tag. Application name: " + applicationDTO.getName();
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
@@ -2667,7 +2667,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             ConnectionManagerUtil.beginDBTransaction();
             if (applicationDAO.getTagForTagName(newTagName, tenantId) != null){
                 String msg =
-                        "You are trying to modify tag name into existing tag. Therefore you can't modify tag name from "
+                        "You are trying to modify tag name into existing tag. Therefore you cannot modify tag name from "
                                 + oldTagName + " to new tag name " + newTagName;
                 log.error(msg);
                 throw new BadRequestException(msg);
@@ -2771,7 +2771,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                         .collect(Collectors.toList());
             } else {
                 String msg = "Tag list is either null or empty. In order to add new tags for application which has "
-                        + "application ID: " + appId +", tag list should be a list of Stings. Therefore please "
+                        + "application name: " + applicationDTO.getName() +", tag list should be a list of Stings. Therefore please "
                         + "verify the payload.";
                 log.error(msg);
                 throw new BadRequestException(msg);
@@ -2877,11 +2877,17 @@ public class ApplicationManagerImpl implements ApplicationManager {
     @Override
     public void updateCategory(String oldCategoryName, String newCategoryName) throws ApplicationManagementException {
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
+        if (StringUtils.isEmpty(oldCategoryName) || StringUtils.isEmpty(newCategoryName)) {
+            String msg = "Either old category name or new category name contains empty/null value. Hence please verify the "
+                    + "request.";
+            log.error(msg);
+            throw new BadRequestException(msg);
+        }
         try {
             ConnectionManagerUtil.beginDBTransaction();
             CategoryDTO category = applicationDAO.getCategoryForCategoryName(oldCategoryName, tenantId);
             if (category == null){
-                String msg = "Couldn't found a category for tag name " + oldCategoryName + ".";
+                String msg = "Couldn't found a category for category name " + oldCategoryName + ".";
                 log.error(msg);
                 throw new NotFoundException(msg);
             }
@@ -2893,7 +2899,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (TransactionManagementException e) {
-            String msg = "Database access error is occurred when updating categiry.";
+            String msg = "Database access error is occurred when updating category.";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (ApplicationManagementDAOException e) {
@@ -2923,7 +2929,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
      */
     private void validateFilter(Filter filter) throws BadRequestException {
         if (filter == null) {
-            String msg = "Filter validation is failed, Filter shouldn't be null, hence please verify the request payload";
+            String msg = "Filter validation is failed, Filter should not be null, hence please verify the request payload";
             log.error(msg);
             throw new BadRequestException(msg);
         }
@@ -3068,11 +3074,11 @@ public class ApplicationManagerImpl implements ApplicationManager {
             throw new ApplicationManagementException(msg, e);
         } catch (ApplicationManagementDAOException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
-            String msg = "Error occured when updating Ent Application release of UUID: " + releaseUuid;
+            String msg = "Error occurred when updating Ent Application release of UUID: " + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (ResourceManagementException e) {
-            String msg = "Error occured when updating application release artifact in the file system. Ent App release "
+            String msg = "Error occurred when updating application release artifact in the file system. Ent App release "
                     + "UUID:" + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
@@ -3137,11 +3143,11 @@ public class ApplicationManagerImpl implements ApplicationManager {
             throw new ApplicationManagementException(msg, e);
         } catch (ApplicationManagementDAOException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
-            String msg = "Error occured when updating public app release of UUID: " + releaseUuid;
+            String msg = "Error occurred when updating public app release of UUID: " + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (ResourceManagementException e) {
-            String msg = "Error occured when updating public app release artifact in the file system. Public app "
+            String msg = "Error occurred when updating public app release artifact in the file system. Public app "
                     + "release UUID:" + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
@@ -3202,11 +3208,11 @@ public class ApplicationManagerImpl implements ApplicationManager {
             throw new ApplicationManagementException(msg, e);
         } catch (ApplicationManagementDAOException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
-            String msg = "Error occured when updating web app release for web app Release UUID: " + releaseUuid;
+            String msg = "Error occurred when updating web app release for web app Release UUID: " + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (ResourceManagementException e) {
-            String msg = "Error occured when updating web app release artifact in the file system. Web app "
+            String msg = "Error occurred when updating web app release artifact in the file system. Web app "
                     + "release UUID:" + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
@@ -3266,7 +3272,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
                                 ConnectionManagerUtil.getDBConnection();
                                 if (this.applicationReleaseDAO.verifyReleaseExistenceByHash(md5OfApp, tenantId)) {
                                     String msg =
-                                            "Same binary file is in the server. Hence you can't add same file into the "
+                                            "Same binary file is in the server. Hence you cannot add same file into the "
                                                     + "server. Device Type: " + deviceTypeObj.getName()
                                                     + " and package name: " + applicationDTO.getApplicationReleaseDTOs()
                                                     .get(0).getPackageName();
@@ -3327,11 +3333,11 @@ public class ApplicationManagerImpl implements ApplicationManager {
             throw new ApplicationManagementException(msg, e);
         } catch (ApplicationManagementDAOException e) {
             ConnectionManagerUtil.rollbackDBTransaction();
-            String msg = "Error occured when updating Ent Application release of UUID: " + releaseUuid;
+            String msg = "Error occurred when updating Ent Application release of UUID: " + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (ResourceManagementException e) {
-            String msg = "Error occured when updating application release artifact in the file system. Ent App release "
+            String msg = "Error occurred when updating application release artifact in the file system. Ent App release "
                     + "UUID:" + releaseUuid;
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
@@ -3447,17 +3453,17 @@ public class ApplicationManagerImpl implements ApplicationManager {
             }
             appCategories = applicationWrapper.getCategories();
             if (appCategories == null) {
-                String msg = "Application category can't be null.";
+                String msg = "Application category cannot be null.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (appCategories.isEmpty()) {
-                String msg = "Application category can't be empty.";
+                String msg = "Application category cannot be empty.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (StringUtils.isEmpty(applicationWrapper.getDeviceType())) {
-                String msg = "Device type can't be empty for the application.";
+                String msg = "Device type cannot be empty for the application.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
@@ -3479,12 +3485,12 @@ public class ApplicationManagerImpl implements ApplicationManager {
             }
             appCategories = webAppWrapper.getCategories();
             if (appCategories == null) {
-                String msg = "Web Clip category can't be null.";
+                String msg = "Web Clip category cannot be null.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (appCategories.isEmpty()) {
-                String msg = "Web clip category can't be empty.";
+                String msg = "Web clip category cannot be empty.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
@@ -3512,17 +3518,17 @@ public class ApplicationManagerImpl implements ApplicationManager {
             }
             appCategories = publicAppWrapper.getCategories();
             if (appCategories == null) {
-                String msg = "Application category can't be null.";
+                String msg = "Application category cannot be null.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (appCategories.isEmpty()) {
-                String msg = "Application category can't be empty.";
+                String msg = "Application category cannot be empty.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (StringUtils.isEmpty(publicAppWrapper.getDeviceType())) {
-                String msg = "Device type can't be empty for the public application.";
+                String msg = "Device type cannot be empty for the public application.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
@@ -3544,17 +3550,17 @@ public class ApplicationManagerImpl implements ApplicationManager {
             }
             appCategories = customAppWrapper.getCategories();
             if (appCategories == null) {
-                String msg = "Application category can't be null.";
+                String msg = "Application category cannot be null.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (appCategories.isEmpty()) {
-                String msg = "Application category can't be empty.";
+                String msg = "Application category cannot be empty.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (StringUtils.isEmpty(customAppWrapper.getDeviceType())) {
-                String msg = "Device type can't be empty for the application.";
+                String msg = "Device type cannot be empty for the application.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
@@ -3646,7 +3652,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
     @Override
     public <T> void validateReleaseCreatingRequest(T param, String deviceType) throws ApplicationManagementException {
         if (param == null) {
-            String msg = "In order to validate release creating request param shouldn't be null.";
+            String msg = "In order to validate release creating request param should not be null.";
             log.error(msg);
             throw new BadRequestException(msg);
         }
@@ -3655,7 +3661,7 @@ public class ApplicationManagerImpl implements ApplicationManager {
             AtomicReference<EntAppReleaseWrapper> entAppReleaseWrapper = new AtomicReference<>(
                     (EntAppReleaseWrapper) param);
             if (StringUtils.isEmpty(entAppReleaseWrapper.get().getSupportedOsVersions())) {
-                String msg = "Supported OS Version shouldn't be null or empty.";
+                String msg = "Supported OS Version should not be null or empty.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
@@ -3679,12 +3685,12 @@ public class ApplicationManagerImpl implements ApplicationManager {
             WebAppReleaseWrapper webAppReleaseWrapper = (WebAppReleaseWrapper) param;
             UrlValidator urlValidator = new UrlValidator();
             if (StringUtils.isEmpty(webAppReleaseWrapper.getVersion())) {
-                String msg = "Version shouldn't be empty or null for the WEB CLIP release creating request.";
+                String msg = "Version should not be empty or null for the WEB CLIP release creating request.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (StringUtils.isEmpty(webAppReleaseWrapper.getUrl())) {
-                String msg = "URL should't be null for the application release creating request for application type "
+                String msg = "URL should not be null for the application release creating request for application type "
                         + "WEB_CLIP";
                 log.error(msg);
                 throw new BadRequestException(msg);
@@ -3697,17 +3703,17 @@ public class ApplicationManagerImpl implements ApplicationManager {
         } else if (param instanceof PublicAppReleaseWrapper) {
             PublicAppReleaseWrapper publicAppReleaseWrapper = (PublicAppReleaseWrapper) param;
             if (StringUtils.isEmpty(publicAppReleaseWrapper.getSupportedOsVersions())) {
-                String msg = "Supported OS Version shouldn't be null or empty for public app release creating request.";
+                String msg = "Supported OS Version should not be null or empty for public app release creating request.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (StringUtils.isEmpty(publicAppReleaseWrapper.getVersion())) {
-                String msg = "Version shouldn't be empty or null for the Public App release creating request.";
+                String msg = "Version should not be empty or null for the Public App release creating request.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (StringUtils.isEmpty(publicAppReleaseWrapper.getPackageName())) {
-                String msg = "Package name shouldn't be empty or null for the Public App release creating request.";
+                String msg = "Package name should not be empty or null for the Public App release creating request.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
@@ -3721,12 +3727,12 @@ public class ApplicationManagerImpl implements ApplicationManager {
         } else if (param instanceof CustomAppReleaseWrapper) {
             CustomAppReleaseWrapper customAppReleaseWrapper = (CustomAppReleaseWrapper) param;
             if (StringUtils.isEmpty(customAppReleaseWrapper.getVersion())) {
-                String msg = "Version shouldn't be empty or null for the custom App release creating request.";
+                String msg = "Version should not be empty or null for the custom App release creating request.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
             if (StringUtils.isEmpty(customAppReleaseWrapper.getPackageName())) {
-                String msg = "Package name shouldn't be empty or null for the custom App release creating request.";
+                String msg = "Package name should not be empty or null for the custom App release creating request.";
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
@@ -3864,11 +3870,11 @@ public class ApplicationManagerImpl implements ApplicationManager {
             }
             ConnectionManagerUtil.commitDBTransaction();
         } catch (ApplicationManagementDAOException e) {
-            String msg = "Error occured while updating app subscription status of the device.";
+            String msg = "Error occurred while updating app subscription status of the device.";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (DBConnectionException e) {
-            String msg = "Error occurred while obersving the database connection to update aoo subscription status of "
+            String msg = "Error occurred while observing the database connection to update aoo subscription status of "
                     + "device.";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
@@ -3895,11 +3901,11 @@ public class ApplicationManagerImpl implements ApplicationManager {
             }
             ConnectionManagerUtil.commitDBTransaction();
         } catch (ApplicationManagementDAOException e) {
-            String msg = "Error occured while updating app subscription status of the device.";
+            String msg = "Error occurred while updating app subscription status of the device.";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);
         } catch (DBConnectionException e) {
-            String msg = "Error occurred while obersving the database connection to update aoo subscription status of "
+            String msg = "Error occurred while observing the database connection to update aoo subscription status of "
                     + "device.";
             log.error(msg, e);
             throw new ApplicationManagementException(msg, e);

components/application-mgt/io.entgra.application.mgt.core/src/main/java/io/entgra/application/mgt/core/impl/ReviewManagerImpl.java

@@ -393,11 +393,11 @@ public class ReviewManagerImpl implements ReviewManager {
             }
             return getReviewTree(this.reviewDAO.getAllReleaseReviews(releaseDTO.getId(), request, tenantId));
         } catch (ReviewManagementDAOException e) {
-            String msg = "Error occured while getting all reviews for application uuid: " + uuid;
+            String msg = "Error occurred while getting all reviews for application uuid: " + uuid;
             log.error(msg, e);
             throw new ReviewManagementException(msg, e);
         } catch (DBConnectionException e) {
-            String msg ="Error occured while getting the DB connection to get all reviews for application release which"
+            String msg ="Error occurred while getting the DB connection to get all reviews for application release which"
                     + " has UUID " + uuid;
             log.error(msg, e);
             throw new ReviewManagementException(msg, e);

components/application-mgt/io.entgra.application.mgt.publisher.api/src/main/java/io/entgra/application/mgt/publisher/api/services/impl/ApplicationManagementPublisherAPIImpl.java

@@ -89,11 +89,11 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             ApplicationList applications = applicationManager.getApplications(filter);
             return Response.status(Response.Status.OK).entity(applications).build();
         } catch (BadRequestException e) {
-            String msg = "Incompatible request payload is found. Please try with valid request payload.";
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (UnexpectedServerErrorException e) {
-            String msg = "Error Occured when getting supported device types by Entgra IoTS";
+            String msg = "Error occurred when getting supported device types by Entgra IoTS";
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (ApplicationManagementException e) {
@@ -173,7 +173,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
         try {
             return createApplication(applicationWrapper, isPublished);
         } catch (BadRequestException e) {
-            String msg = "Found incompatible payload with ent. app creating request.";
+            String msg = "Found incompatible payload with ent. app creating request. Please try with valid request payload.";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
@@ -181,7 +181,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (RequestValidatingException e) {
-            String msg = "Couldn't find the required artifacts to create new ent. application with the request";
+            String msg = "Could not find the required artifacts to create new enterprise application with the request";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
@@ -195,7 +195,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
         try {
             return createApplication(webAppWrapper, isPublished);
         } catch (BadRequestException e) {
-            String msg = "Found incompatible payload with web app creating request.";
+            String msg = "Found incompatible payload with web app creating request. Please try with valid request payload.";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
@@ -203,7 +203,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (RequestValidatingException e) {
-            String msg = "Couldn't find the required artifacts to create new web application with the request";
+            String msg = "Could not find the required artifacts to create new web application with the request";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
@@ -217,7 +217,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
         try {
             return createApplication(publicAppWrapper, isPublished);
         } catch (BadRequestException e) {
-            String msg = "Found incompatible payload with pub app creating request.";
+            String msg = "Found incompatible payload with pub app creating request. Please try with valid request payload.";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
@@ -225,7 +225,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (RequestValidatingException e) {
-            String msg = "Couldn't find the required artifacts to create new public application with the request";
+            String msg = "Could not find the required artifacts to create new public application with the request";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
@@ -239,7 +239,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
         try {
             return createApplication(customAppWrapper, isPublished);
         } catch (BadRequestException e) {
-            String msg = "Found incompatible payload with custom app creating request.";
+            String msg = "Found incompatible payload with custom app creating request. Please try with valid request payload.";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
@@ -247,7 +247,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (RequestValidatingException e) {
-            String msg = "Couldn't find the required artifacts to create new custom application with the request";
+            String msg = "Could not find the required artifacts to create new custom application with the request";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
@@ -267,7 +267,11 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             ApplicationRelease release = applicationManager.createEntAppRelease(appId, entAppReleaseWrapper, isPublished);
             return Response.status(Response.Status.CREATED).entity(release).build();
         } catch (RequestValidatingException e) {
-            String msg = "Error occurred while validating binaryArtifact";
+            String msg = e.getMessage();
+            log.error(msg, e);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
+        } catch (BadRequestException e){
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
@@ -291,6 +295,10 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             applicationManager.validatePublicAppReleaseCreatingRequest(publicAppReleaseWrapper, deviceTypeName);
             ApplicationRelease applicationRelease = applicationManager.createPubAppRelease(appId, publicAppReleaseWrapper, isPublished);
             return Response.status(Response.Status.CREATED).entity(applicationRelease).build();
+        } catch (BadRequestException e) {
+            String msg = e.getMessage();
+            log.error(msg, e);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
             String msg = "Error occurred while creating application release for the application with the id " + appId;
             log.error(msg, e);
@@ -300,7 +308,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (RequestValidatingException e) {
-            String msg = "Invalid payload found in public app release create request";
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
@@ -318,6 +326,10 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             applicationManager.validateWebAppReleaseCreatingRequest(webAppReleaseWrapper);
             ApplicationRelease applicationRelease= applicationManager.createWebAppRelease(appId, webAppReleaseWrapper, isPublished);
             return Response.status(Response.Status.CREATED).entity(applicationRelease).build();
+        } catch (BadRequestException e) {
+            String msg = e.getMessage();
+            log.error(msg, e);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ResourceManagementException e) {
             String msg = "Error occurred while uploading application release artifacts";
             log.error(msg, e);
@@ -327,7 +339,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (RequestValidatingException e) {
-            String msg = "Invalid payload found in web app release create request";
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
@@ -346,8 +358,12 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             applicationManager.validateCustomAppReleaseCreatingRequest(customAppReleaseWrapper, deviceTypeName);
             ApplicationRelease release = applicationManager.createCustomAppRelease(appId, customAppReleaseWrapper, isPublished);
             return Response.status(Response.Status.CREATED).entity(release).build();
+        } catch (BadRequestException e) {
+            String msg = e.getMessage();
+            log.error(msg, e);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (RequestValidatingException e) {
-            String msg = "Error occurred while validating binaryArtifact";
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ResourceManagementException e) {
@@ -369,21 +385,24 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             @QueryParam("appName") String appName){
         try {
             if (appName == null) {
-                String msg = "Invalid app name, appName query param cannot be empty/null.";
+                String msg = "Invalid app name, application name cannot be empty/null.";
                 log.error(msg);
                 return Response.status(Response.Status.BAD_REQUEST).build();
             }
             ApplicationManager applicationManager = APIUtil.getApplicationManager();
             if (applicationManager.isExistingAppName(appName, deviceType)) {
-                return Response.status(Response.Status.CONFLICT).build();
+                String msg = "Application name already exists";
+                return Response.status(Response.Status.CONFLICT).entity(msg).build();
             }
             return Response.status(Response.Status.OK).build();
         } catch (BadRequestException e) {
-            log.error("Found invalid device type to check application existence.", e);
-            return Response.status(Response.Status.BAD_REQUEST).build();
+            String msg = e.getMessage();
+            log.error(msg, e);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
-            log.error("Internal Error occurred while checking the application existence.", e);
-            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
+            String msg = "Internal Error occurred while checking the application existence.";
+            log.error(msg, e);
+            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         }
     }
 
@@ -439,7 +458,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
                             + applicationReleaseUuid).build();
         } catch (RequestValidatingException e) {
             String msg =
-                    "Couldn't find the binary file with the request. Hence invoke the API with updating application"
+                    "Could not find the binary file with the request. Hence invoke the API with updating application"
                             + " artifact";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
@@ -451,6 +470,10 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             String msg = "Found an invalid device type: " + deviceType + " with the request";
             log.error(msg);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
+        } catch (ForbiddenException e) {
+            String msg = e.getMessage();
+            log.error(msg, e);
+            return Response.status(Response.Status.FORBIDDEN).entity(msg).build();
         } catch (ApplicationManagementException e) {
             String msg = "Error occurred while updating the image artifacts of the application with the uuid "
                     + applicationReleaseUuid;
@@ -474,8 +497,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             log.error(msg, e);
             return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         } catch (BadRequestException e) {
-            String msg = "Error occurred while modifying the application. Found bad request payload for updating the "
-                    + "application";
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
@@ -505,8 +527,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             }
             return Response.status(Response.Status.OK).entity(applicationRelease).build();
         } catch (BadRequestException e) {
-            String msg =
-                    "Invalid request to update ent app release for application release UUID " + applicationUUID;
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (NotFoundException e) {
@@ -546,7 +567,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             }
             return Response.status(Response.Status.OK).entity(applicationRelease).build();
         } catch (BadRequestException e) {
-            String msg = "Invalid request to update public app release for application release UUID " + applicationUUID;
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (NotFoundException e) {
@@ -586,7 +607,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             }
             return Response.status(Response.Status.OK).entity(applicationRelease).build();
         } catch (BadRequestException e) {
-            String msg = "Invalid request to update web app release for web app release UUID " + applicationUUID;
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (NotFoundException e) {
@@ -625,8 +646,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             }
             return Response.status(Response.Status.OK).entity(applicationRelease).build();
         } catch (BadRequestException e) {
-            String msg =
-                    "Invalid request to update ent app release for application release UUID " + applicationUUID;
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (NotFoundException e) {
@@ -676,7 +696,7 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
                     .changeLifecycleState(applicationUuid, lifecycleChanger);
             return Response.status(Response.Status.CREATED).entity(applicationRelease).build();
         } catch (BadRequestException e) {
-            String msg = "Request payload contains invalid data, hence verify the request payload.";
+            String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).build();
         } catch (ForbiddenException e) {
@@ -838,6 +858,10 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
         try {
             List<String> applicationTags = applicationManager.addApplicationTags(appId, tagNames);
             return Response.status(Response.Status.OK).entity(applicationTags).build();
+        } catch (BadRequestException e) {
+            String msg = e.getMessage();
+            log.error(msg, e);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (NotFoundException e) {
             String msg = e.getMessage();
             log.error(msg, e);

components/application-mgt/io.entgra.application.mgt.publisher.api/src/main/java/io/entgra/application/mgt/publisher/api/services/impl/SPApplicationServiceImpl.java

@@ -96,6 +96,7 @@ public class SPApplicationServiceImpl implements SPApplicationService {
         } catch (NotFoundException e) {
             String msg = "Identity server with the id " + id + " does not exist.";
             log.error(msg, e);
+            // TODO : the correct way is to use the NOT_FOUND response here. In order to do it changes are needed for the UI code as well
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
             String errMsg = "Error occurred while trying to merge identity server apps with existing apps";
@@ -115,6 +116,7 @@ public class SPApplicationServiceImpl implements SPApplicationService {
         } catch (NotFoundException e) {
             String msg = "Identity server with the id " + id + " does not exist.";
             log.error(msg, e);
+            // TODO : the correct way is to use the NOT_FOUND response here. In order to do it changes are needed for the UI code as well
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (ApplicationManagementException e) {
             String errMsg = "Error occurred while trying to merge identity server apps with existing apps";
@@ -134,9 +136,10 @@ public class SPApplicationServiceImpl implements SPApplicationService {
         } catch (NotFoundException e) {
             String msg = "Identity server with the id " + id + " does not exist.";
             log.error(msg, e);
+            // TODO : the correct way is to use the NOT_FOUND response here. In order to do it changes are needed for the UI code as well
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (BadRequestException e) {
-            String errMsg = "Identity server request payload is invalid";
+            String errMsg = e.getMessage();
             log.error(errMsg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(errMsg).build();
         } catch (ApplicationManagementException e) {
@@ -156,8 +159,8 @@ public class SPApplicationServiceImpl implements SPApplicationService {
             IdentityServerResponse identityServer = spAppManager.createIdentityServer(identityServerDTO);
             return Response.status(Response.Status.CREATED).entity(identityServer).build();
         } catch (BadRequestException e) {
-            String errMsg = "Identity server request payload is invalid";
-            log.error(errMsg, e);
+            String errMsg = e.getMessage();
+                    log.error(errMsg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(errMsg).build();
         } catch (ApplicationManagementException e) {
             String errMsg = "Error occurred while trying to merge identity server apps with existing apps";
@@ -179,7 +182,8 @@ public class SPApplicationServiceImpl implements SPApplicationService {
             }
             SPApplicationManager spAppManager = APIUtil.getSPApplicationManager();
             if (spAppManager.isIdentityServerNameExist(identityServerName)) {
-                return Response.status(Response.Status.CONFLICT).build();
+                String msg = "Identity server name already exists";
+                return Response.status(Response.Status.CONFLICT).entity(msg).build();
             }
             return Response.status(Response.Status.OK).build();
         } catch (BadRequestException e) {
@@ -206,7 +210,8 @@ public class SPApplicationServiceImpl implements SPApplicationService {
             }
             SPApplicationManager spAppManager = APIUtil.getSPApplicationManager();
             if (spAppManager.isIdentityServerUrlExist(identityServerUrl)) {
-                return Response.status(Response.Status.CONFLICT).build();
+                String msg = "Identity server Url already exists";
+                return Response.status(Response.Status.CONFLICT).entity(msg).build();
             }
             return Response.status(Response.Status.OK).build();
         } catch (BadRequestException e) {
@@ -232,6 +237,7 @@ public class SPApplicationServiceImpl implements SPApplicationService {
         } catch (NotFoundException e) {
             String errMsg = "No Identity server exist with the id: " + identityServerId;
             log.error(errMsg, e);
+            // TODO : the correct way is to use the NOT_FOUND response here. In order to do it changes are needed for the UI code as well
             return Response.status(Response.Status.BAD_REQUEST).entity(errMsg).build();
         } catch (ApplicationManagementException e) {
             String errMsg = "Error occurred while trying to merge identity server apps with existing apps";
@@ -252,6 +258,7 @@ public class SPApplicationServiceImpl implements SPApplicationService {
         } catch (NotFoundException e) {
             String msg = "No identity server exist with the id " + identityServerId;
             log.error(msg, e);
+            // TODO : the correct way is to use the NOT_FOUND response here. In order to do it changes are needed for the UI code as well
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (BadRequestException e) {
             String msg = "Invalid appIds provided";
@@ -277,6 +284,7 @@ public class SPApplicationServiceImpl implements SPApplicationService {
         } catch (NotFoundException e) {
             String msg = "No identity server exist with the id " + identityServerId;
             log.error(msg, e);
+            // TODO : the correct way is to use the NOT_FOUND response here. In order to do it changes are needed for the UI code as well
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (BadRequestException e) {
             String msg = "Invalid appIds provided";
@@ -343,6 +351,7 @@ public class SPApplicationServiceImpl implements SPApplicationService {
         } catch (NotFoundException e) {
             String msg = "No identity server exist with the id " + identityServerId;
             log.error(msg, e);
+            // TODO : the correct way is to use the NOT_FOUND response here. In order to do it changes are needed for the UI code as well
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (BadRequestException e) {
             String msg = "Found incompatible payload with create service provider app request.";

components/application-mgt/io.entgra.application.mgt.publisher.api/src/main/java/io/entgra/application/mgt/publisher/api/services/impl/admin/ApplicationManagementPublisherAdminAPIImpl.java

@@ -155,6 +155,10 @@ public class ApplicationManagementPublisherAdminAPIImpl implements ApplicationMa
             applicationManager.updateCategory(oldCategoryName, newCategoryName);
             return Response.status(Response.Status.OK)
                     .entity("Category is updated from " + oldCategoryName + " to " + newCategoryName).build();
+        } catch (BadRequestException e) {
+            String msg = e.getMessage();
+            log.error(msg, e);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (NotFoundException e) {
             String msg = e.getMessage();
             log.error(msg, e);
@@ -181,6 +185,10 @@ public class ApplicationManagementPublisherAdminAPIImpl implements ApplicationMa
             String msg = e.getMessage();
             log.error(msg, e);
             return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
+        } catch (ForbiddenException e) {
+            String msg = e.getMessage();
+            log.error(msg, e);
+            return Response.status(Response.Status.FORBIDDEN).entity(msg).build();
         } catch (ApplicationManagementException e) {
             String msg = "Error Occurred while deleting registered category.";
             log.error(msg, e);

components/application-mgt/io.entgra.application.mgt.publisher.api/src/main/java/io/entgra/application/mgt/publisher/api/services/impl/admin/ReviewManagementPublisherAdminAPIImpl.java

@@ -84,7 +84,7 @@ public class ReviewManagementPublisherAdminAPIImpl implements ReviewManagementPu
             log.error(msg, e);
             return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         } catch (ReviewManagementException | ApplicationManagementException e) {
-            String msg = "Error occured while getting review data for application release UUID: " + uuid;
+            String msg = "Error occurred while getting review data for application release UUID: " + uuid;
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
         }
@@ -105,7 +105,7 @@ public class ReviewManagementPublisherAdminAPIImpl implements ReviewManagementPu
             log.error(msg, e);
             return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         } catch (ReviewManagementException | ApplicationManagementException e) {
-            String msg = "Error occured while getting review data for application release UUID: " + uuid;
+            String msg = "Error occurred while getting review data for application release UUID: " + uuid;
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
         }

components/device-mgt/io.entgra.carbon.device.mgt.config.api/src/main/java/io/entgra/carbon/device/mgt/config/jaxrs/service/impl/DeviceManagementConfigServiceImpl.java

@@ -91,9 +91,7 @@ public class DeviceManagementConfigServiceImpl implements DeviceManagementConfig
             if (properties == null || properties.isEmpty()) {
                 String msg = "Devices configuration retrieval criteria cannot be null or empty.";
                 log.error(msg);
-                return Response.status(Response.Status.BAD_REQUEST).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()
-                ).build();
+                return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
             }
 
             ObjectMapper mapper = new ObjectMapper();
@@ -113,18 +111,15 @@ public class DeviceManagementConfigServiceImpl implements DeviceManagementConfig
                     new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
         } catch (DeviceNotFoundException e) {
             log.warn(e.getMessage());
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(e.getMessage()).build()).build();
+            return Response.status(Response.Status.BAD_REQUEST).entity(e.getMessage()).build();
         } catch (AmbiguousConfigurationException e) {
             String msg = "Configurations are ambiguous. " + e.getMessage();
             log.warn(msg);
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (JsonParseException | JsonMappingException e) {
             String msg = "Malformed device property structure";
             log.error(msg.concat(" ").concat(properties), e);
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (IOException e) {
             String msg = "Error occurred while parsing query param JSON data.";
             log.error(msg.concat(" ").concat(properties), e);
@@ -150,8 +145,7 @@ public class DeviceManagementConfigServiceImpl implements DeviceManagementConfig
             if (devicesTransferred.isEmpty()) {
                 String msg = "Devices are not enrolled to super tenant";
                 log.warn(msg);
-                return Response.status(Response.Status.BAD_REQUEST).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+                return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
             } else {
                 return Response.status(Response.Status.OK).entity(devicesTransferred).build();
             }
@@ -163,8 +157,7 @@ public class DeviceManagementConfigServiceImpl implements DeviceManagementConfig
                     new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
         } catch (DeviceNotFoundException e) {
             log.error(e.getMessage(), e);
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(e.getMessage()).build()).build();
+            return Response.status(Response.Status.BAD_REQUEST).entity(e.getMessage()).build();
         }
     }
 

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/ActivityProviderServiceImpl.java

@@ -74,9 +74,9 @@ public class ActivityProviderServiceImpl implements ActivityInfoProviderService
                 dmService = DeviceMgtAPIUtils.getDeviceManagementService();
                 activity = dmService.getOperationByActivityId(id);
                 if (activity == null) {
-                    return Response.status(404).entity(
-                            new ErrorResponse.ErrorResponseBuilder().setMessage("No activity can be " +
-                                    "found upon the provided activity id '" + id + "'").build()).build();
+                    String msg = "No activity can be " +
+                            "found upon the provided activity id '" + id + "'";
+                    return Response.status(404).entity(msg).build();
                 }
                 return Response.status(Response.Status.OK).entity(activity).build();
             } catch (OperationManagementException e) {
@@ -98,10 +98,9 @@ public class ActivityProviderServiceImpl implements ActivityInfoProviderService
         List<String> idList;
         idList = activityIdList.getIdList();
         if (idList == null || idList.isEmpty()) {
-            String msg = "Activity Ids shouldn't be empty";
+            String msg = "Activities should not be empty";
             log.error(msg);
-            return Response.status(400).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+            return Response.status(400).entity(msg).build();
         }
         Response validationFailedResponse = validateAdminPermission();
         if (validationFailedResponse == null) {
@@ -125,8 +124,7 @@ public class ActivityProviderServiceImpl implements ActivityInfoProviderService
                 } else {
                     String msg = "No activity found with the given IDs.";
                     log.error(msg);
-                    return Response.status(404).entity(
-                            new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+                    return Response.status(404).entity(msg).build();
                 }
             } catch (OperationManagementException e) {
                 String msg = "ErrorResponse occurred while fetching the activity list for the supplied ids.";
@@ -162,9 +160,9 @@ public class ActivityProviderServiceImpl implements ActivityInfoProviderService
             dmService = DeviceMgtAPIUtils.getDeviceManagementService();
             activity = dmService.getOperationByActivityIdAndDevice(id, deviceIdentifier);
             if (activity == null) {
-                return Response.status(404).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("No activity can be " +
-                                "found upon the provided activity id '" + id + "'").build()).build();
+                String msg = "No activity can be " +
+                        "found upon the provided activity id '" + id + "'";
+                return Response.status(404).entity(msg).build();
             }
             return Response.status(Response.Status.OK).entity(activity).build();
         } catch (OperationManagementException e) {
@@ -247,9 +245,8 @@ public class ActivityProviderServiceImpl implements ActivityInfoProviderService
             try {
                 ifSinceDate = format.parse(ifModifiedSince);
             } catch (ParseException e) {
-                return Response.status(400).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage(
-                                "Invalid date string is provided in 'If-Modified-Since' header").build()).build();
+                String msg = "Invalid date string is provided in [If-Modified-Since] header.";
+                return Response.status(400).entity(msg).build();
             }
             ifModifiedSinceTimestamp = ifSinceDate.getTime();
             timestamp = ifModifiedSinceTimestamp / 1000;
@@ -259,9 +256,8 @@ public class ActivityProviderServiceImpl implements ActivityInfoProviderService
             try {
                 sinceDate = format.parse(since);
             } catch (ParseException e) {
-                return Response.status(400).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage(
-                                "Invalid date string is provided in 'since' filter").build()).build();
+                String msg = "Invalid date string is provided in [since] filter.";
+                return Response.status(400).entity(msg).build();
             }
             sinceTimestamp = sinceDate.getTime();
             timestamp = sinceTimestamp / 1000;

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/DeviceManagementServiceImpl.java

@@ -199,10 +199,8 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             @QueryParam("limit") int limit) {
         try {
             if (!StringUtils.isEmpty(name) && !StringUtils.isEmpty(role)) {
-                return Response.status(Response.Status.BAD_REQUEST).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("Request contains both name and role " +
-                                "parameters. Only one is allowed " +
-                                "at once.").build()).build();
+                String msg = "Request contains both name and role parameters. Only one is allowed at once.";
+                return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
             }
 //            RequestValidationUtil.validateSelectionCriteria(type, user, roleName, ownership, status);
             RequestValidationUtil.validatePaginationParameters(offset, limit);
@@ -291,9 +289,8 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                 try {
                     sinceDate = format.parse(ifModifiedSince);
                 } catch (ParseException e) {
-                    return Response.status(Response.Status.BAD_REQUEST).entity(
-                            new ErrorResponse.ErrorResponseBuilder().setMessage("Invalid date " +
-                                    "string is provided in 'If-Modified-Since' header").build()).build();
+                    String msg = "Invalid date string is provided in [If-Modified-Since] header";
+                    return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
                 }
                 request.setSince(sinceDate);
                 if (requireDeviceInfo) {
@@ -312,9 +309,8 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                 try {
                     sinceDate = format.parse(since);
                 } catch (ParseException e) {
-                    return Response.status(Response.Status.BAD_REQUEST).entity(
-                            new ErrorResponse.ErrorResponseBuilder().setMessage("Invalid date " +
-                                    "string is provided in 'since' filter").build()).build();
+                    String msg = "Invalid date string is provided in [since] filter";
+                    return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
                 }
                 request.setSince(sinceDate);
                 if (requireDeviceInfo) {
@@ -646,6 +642,10 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                 String msg = "Error occurred while retrieving role list of user '" + authorizedUser + "'";
                 log.error(msg);
                 return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
+            }catch (BadRequestException e){
+                String msg = "Error occurred while validating the device group.";
+                log.error(msg);
+                return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
             }
 
             PaginationResult result = dms.getAllDevices(request, false);
@@ -662,7 +662,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             }
             return Response.status(Response.Status.OK).entity(devices).build();
         } catch (BadRequestException e) {
-            String msg = "Invalid type, use either 'path' or 'full'";
+            String msg = "Invalid type, use either [path] or [full]";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (UnAuthorizedException e) {
@@ -696,12 +696,9 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             boolean response = deviceManagementProviderService.disenrollDevice(deviceIdentifier);
             return Response.status(Response.Status.OK).entity(response).build();
         } catch (DeviceManagementException e) {
-            String msg = "Error encountered while deleting device of type : " + deviceType + " and " +
-                    "ID : " + deviceId;
+            String msg = "Error encountered while deleting requested device of type : " + deviceType ;
             log.error(msg, e);
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()
-            ).build();
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
     }
 
@@ -719,11 +716,9 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             return Response.status(Response.Status.CREATED).entity(response).build();
 
         } catch (DeviceManagementException e) {
-            log.error("Error encountered while updating device of type : " + deviceType + " and " +
-                    "ID : " + deviceId);
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage("Error while updating " +
-                            "device of type " + deviceType + " and ID : " + deviceId).build()).build();
+            String msg = "Error encountered while updating requested device of type : " + deviceType ;
+            log.error(msg, e);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
     }
 
@@ -764,10 +759,9 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                     sinceDate = format.parse(ifModifiedSince);
                     deviceData.setLastModifiedDate(sinceDate);
                 } catch (ParseException e) {
-                    String msg = "Invalid date string is provided in 'If-Modified-Since' header";
+                    String msg = "Invalid date string is provided in [If-Modified-Since] header";
                     log.error(msg, e);
-                    return Response.status(Response.Status.BAD_REQUEST).entity(
-                            new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+                    return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
                 }
             }
 
@@ -794,9 +788,8 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                 return Response.status(Response.Status.NOT_MODIFIED).entity("No device is modified " +
                         "after the timestamp provided in 'If-Modified-Since' header").build();
             }
-            return Response.status(Response.Status.NOT_FOUND).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setCode(HttpStatus.SC_NOT_FOUND).setMessage("Requested device of type '" +
-                            type + "', which carries id '" + id + "' does not exist").build()).build();
+            String msg = "Requested device of type " + type + " does not exist";
+            return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         }
         return Response.status(Response.Status.OK).entity(device).build();
     }
@@ -817,7 +810,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                     dms);
             return Response.status(Response.Status.OK).entity(snapshotWrapper).build();
         } catch (BadRequestException e) {
-            String msg = "Invalid type, use either 'path' or 'full'";
+            String msg = "Invalid type, use either [path] or [full]";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (UnAuthorizedException e) {
@@ -863,12 +856,9 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                 try {
                     sinceDate = format.parse(ifModifiedSince);
                 } catch (ParseException e) {
-                    String message = "Error occurred while parse the since date.Invalid date string is provided in " +
-                            "'If-Modified-Since' header";
+                    String message = "Invalid date string is provided in [If-Modified-Since] header";
                     log.error(message, e);
-                    return Response.status(Response.Status.BAD_REQUEST).entity(
-                            new ErrorResponse.ErrorResponseBuilder().setMessage("Invalid date " +
-                                    "string is provided in 'If-Modified-Since' header").build()).build();
+                    return Response.status(Response.Status.BAD_REQUEST).entity(message).build();
                 }
             }
             if (sinceDate != null) {
@@ -877,16 +867,15 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
                     String message = "No device is modified after the timestamp provided in 'If-Modified-Since' header";
                     log.error(message);
                     return Response.status(Response.Status.NOT_MODIFIED).entity("No device is modified " +
-                            "after the timestamp provided in 'If-Modified-Since' header").build();
+                            "after the timestamp provided in [If-Modified-Since] header").build();
                 }
             } else {
                 device = dms.getDevice(id, requireDeviceInfo);
             }
             if (device == null) {
-                String message = "Device does not exist with id '" + id + "'";
+                String message = "Device does not exist";
                 log.error(message);
-                return Response.status(Response.Status.NOT_FOUND).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setCode(404l).setMessage(message).build()).build();
+                return Response.status(Response.Status.NOT_FOUND).entity(message).build();
             }
             DeviceIdentifier deviceIdentifier = new DeviceIdentifier(id, device.getType());
             // check whether the user is authorized
@@ -918,7 +907,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
         DeviceManagementProviderService deviceManagementProviderService =
                 DeviceMgtAPIUtils.getDeviceManagementService();
         if (deviceIds == null || deviceIds.isEmpty()) {
-            String msg = "Required values of device identifiers are not set..";
+            String msg = "Required values of device identifiers are not set.";
             log.error(msg);
             return Response.status(Response.Status.BAD_REQUEST).build();
         }
@@ -1000,9 +989,8 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             try {
                 fm = dms.getFeatureManager(type);
             } catch (DeviceTypeNotFoundException e) {
-                return Response.status(Response.Status.NOT_FOUND).entity(
-                        new ErrorResponse.ErrorResponseBuilder()
-                                .setMessage("No device type found with name '" + type + "'").build()).build();
+                String msg = "No device type found with name : " + type ;
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
             if (fm != null) {
                 features = fm.getFeatures();
@@ -1224,8 +1212,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             return Response.serverError().entity(
                     new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
         } catch (InputValidationException e) {
-            String msg = "Error occurred while fetching the operations for the '" + type + "' device, which " +
-                    "carries the id '" + id + "'";
+            String msg = "Error occurred while fetching the operations for the type : " + type + " device";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (DeviceManagementException e) {
@@ -1234,7 +1221,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (DeviceTypeNotFoundException e) {
-            String msg = "No device type found with name '" + type + "'";
+            String msg = "No device type found with name : " + type ;
             log.error(msg, e);
             return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         }
@@ -1344,11 +1331,9 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             boolean response = deviceManagementProviderService.changeDeviceStatus(deviceIdentifier, newsStatus);
             return Response.status(Response.Status.OK).entity(response).build();
         } catch (DeviceManagementException e) {
-            String msg = "Error occurred while changing device status of type : " + type + " and " +
-                    "device id : " + id;
+            String msg = "Error occurred while changing device status of device type : " + type ;
             log.error(msg);
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
     }
 
@@ -1376,11 +1361,9 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             List<DeviceStatus> deviceStatusHistory = deviceManagementProviderService.getDeviceStatusHistory(persistedDevice);
             return Response.status(Response.Status.OK).entity(deviceStatusHistory).build();
         } catch (DeviceManagementException e) {
-            String msg = "Error occurred while retreiving device status history for device of type : " + type + " and " +
-                    "device id : " + id;
+            String msg = "Error occurred while retrieving device status history for device of type : " + type ;
             log.error(msg);
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
     }
 
@@ -1408,11 +1391,9 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             List<DeviceStatus> deviceStatusHistory = deviceManagementProviderService.getDeviceCurrentEnrolmentStatusHistory(persistedDevice);
             return Response.status(Response.Status.OK).entity(deviceStatusHistory).build();
         } catch (DeviceManagementException e) {
-            String msg = "Error occurred while retreiving device status history for device of type : " + type + " and " +
-                    "device id : " + id;
+            String msg = "Error occurred while retrieving device status history for device of type : " + type;
             log.error(msg);
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
     }
 
@@ -1489,7 +1470,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(
                     new ErrorResponse.ErrorResponseBuilder().setMessage(errorMessage).build()).build();
         } catch (DeviceManagementException e) {
-            String errorMessage = "Issue in retrieving deivce management service instance";
+            String errorMessage = "Issue in retrieving device management service instance";
             log.error(errorMessage, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(
                     new ErrorResponse.ErrorResponseBuilder().setMessage(errorMessage).build()).build();
@@ -1689,7 +1670,7 @@ public class DeviceManagementServiceImpl implements DeviceManagementService {
             DeviceType deviceTypeObj = DeviceManagerUtil.getDeviceType(
                     deviceType, tenantId);
             if (deviceTypeObj == null) {
-                String msg = "Error, device of type: " + deviceType + " does not exist";
+                String msg = "Device of type: " + deviceType + " does not exist";
                 log.error(msg);
                 return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
             }

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/DeviceTypeManagementServiceImpl.java

@@ -141,16 +141,15 @@ public class DeviceTypeManagementServiceImpl implements DeviceTypeManagementServ
         DeviceManagementProviderService dms;
         try {
             if (StringUtils.isEmpty(type)) {
-                return Response.status(Response.Status.BAD_REQUEST).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("Type cannot be empty.").build()).build();
+                String msg = "Type cannot be empty.";
+                return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
             }
             dms = DeviceMgtAPIUtils.getDeviceManagementService();
             FeatureManager fm = dms.getFeatureManager(type);
 
             if (fm == null) {
-                return Response.status(Response.Status.NOT_FOUND).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("No feature manager is " +
-                                "registered with the given type '" + type + "'").build()).build();
+                String msg = "No feature manager is registered with the given type : " + type ;
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
 
             if (StringUtils.isEmpty(hidden)) {
@@ -165,11 +164,9 @@ public class DeviceTypeManagementServiceImpl implements DeviceTypeManagementServ
             return Response.serverError().entity(
                     new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
         } catch (DeviceTypeNotFoundException e) {
-            String msg = "No device type found with name '" + type + "'";
+            String msg = "No device type found with name : " + type ;
             log.error(msg, e);
-            return Response.status(Response.Status.NOT_FOUND).entity(
-                    new ErrorResponse.ErrorResponseBuilder()
-                            .setMessage(msg).build()).build();
+            return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         }
         return Response.status(Response.Status.OK).entity(features).build();
     }

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/GeoLocationBasedServiceImpl.java

@@ -63,6 +63,7 @@ import org.wso2.carbon.device.mgt.core.util.DeviceManagerUtil;
 import org.wso2.carbon.device.mgt.jaxrs.beans.ErrorResponse;
 import org.wso2.carbon.device.mgt.jaxrs.beans.EventAction;
 import org.wso2.carbon.device.mgt.jaxrs.beans.GeofenceWrapper;
+import org.wso2.carbon.device.mgt.jaxrs.exception.BadRequestException;
 import org.wso2.carbon.device.mgt.jaxrs.service.api.GeoLocationBasedService;
 import org.wso2.carbon.device.mgt.jaxrs.service.impl.util.InputValidationException;
 import org.wso2.carbon.device.mgt.jaxrs.service.impl.util.RequestValidationUtil;
@@ -107,8 +108,9 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
             @QueryParam("from") long from, @QueryParam("to") long to) {
         try {
             if (!DeviceManagerUtil.isPublishLocationResponseEnabled()) {
+                String msg = "Unable to retrieve Geo Device stats. Geo Data publishing does not enabled.";
                 return Response.status(Response.Status.BAD_REQUEST.getStatusCode())
-                        .entity("Unable to retrive Geo Device stats. Geo Data publishing does not enabled.").build();
+                        .entity(msg).build();
             }
         } catch (DeviceManagementException e) {
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR.getStatusCode()).entity(e.getMessage()).build();
@@ -277,7 +279,8 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
                 if (log.isDebugEnabled()) {
                     log.debug("Device not found: " + identifier.toString());
                 }
-                return Response.status(Response.Status.NOT_FOUND.getStatusCode()).build();
+                String msg = "Device not found.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
 
             GeoLocationProviderService geoService = DeviceMgtAPIUtils.getGeoService();
@@ -288,12 +291,11 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
             log.error(error, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(error).build();
         } catch (AlertAlreadyExistException e) {
-            String error = "A geo alert with this name already exists.";
+            String error = "A geo alert with this name already exists. Try with another name.";
             log.error(error, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(error).build();
         } catch (DeviceManagementException e) {
-            String error = "Error occurred while retrieving the device enrollment info of " +
-                    deviceType + " with id: " + deviceId;
+            String error = "Error occurred while retrieving the device enrollment info of requested "+ deviceType + " device.";
             log.error(error, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(error).build();
         }
@@ -314,7 +316,7 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
             log.error(error, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(error).build();
         } catch (AlertAlreadyExistException e) {
-            String error = "A geo alert with this name already exists.";
+            String error = "A geo alert with this name already exists. Try with another name.";
             log.error(error, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(error).build();
         }
@@ -344,23 +346,23 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
                 if (log.isDebugEnabled()) {
                     log.debug("Device not found: " + identifier.toString());
                 }
-                return Response.status(Response.Status.NOT_FOUND.getStatusCode()).build();
+                String msg = "Device not found.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
 
             GeoLocationProviderService geoService = DeviceMgtAPIUtils.getGeoService();
             geoService.updateGeoAlert(alert, identifier, alertType, device.getEnrolmentInfo().getOwner());
             return Response.ok().build();
         } catch (DeviceAccessAuthorizationException | GeoLocationBasedServiceException e) {
-            String error = "Error occurred while creating the geo alert for " + deviceType + " with id: " + deviceId;
+            String error = "Error occurred while updating the geo alert for " + deviceType + " with id: " + deviceId;
             log.error(error, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(error).build();
         } catch (AlertAlreadyExistException e) {
-            String error = "A geo alert with this name already exists.";
+            String error = "A geo alert with this name already exists. Try with another name.";
             log.error(error, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(error).build();
         } catch (DeviceManagementException e) {
-            String error = "Error occurred while retrieving the device enrollment info of " +
-                    deviceType + " with id: " + deviceId;
+            String error = "Error occurred while retrieving the device enrollment info of requested " + deviceType + " device.";
             log.error(error, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(error).build();
         }
@@ -380,7 +382,7 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
             log.error(error, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(error).build();
         } catch (AlertAlreadyExistException e) {
-            String error = "A geo alert with this name already exists.";
+            String error = "A geo alert with this name already exists. Try with another name.";
             log.error(error, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(error).build();
         }
@@ -410,7 +412,8 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
                 if (log.isDebugEnabled()) {
                     log.debug("Device not found: " + identifier.toString());
                 }
-                return Response.status(Response.Status.NOT_FOUND.getStatusCode()).build();
+                String msg = "Device not found.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
 
             GeoLocationProviderService geoService = DeviceMgtAPIUtils.getGeoService();
@@ -421,8 +424,7 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
             log.error(error, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(error).build();
         } catch (DeviceManagementException e) {
-            String error = "Error occurred while retrieving the device enrollment info of " +
-                    deviceType + " with id: " + deviceId;
+            String error = "Error occurred while retrieving the device enrollment info of requested " +deviceType + " device";
             log.error(error, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(error).build();
         }
@@ -467,7 +469,8 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
                 if (log.isDebugEnabled()) {
                     log.debug("Device not found: " + identifier.toString());
                 }
-                return Response.status(Response.Status.NOT_FOUND.getStatusCode()).build();
+                String msg = "Device not found.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
 
             GeoLocationProviderService geoService = DeviceMgtAPIUtils.getGeoService();
@@ -497,8 +500,7 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
             log.error(error, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(error).build();
         } catch (DeviceManagementException e) {
-            String error = "Error occurred while retrieving the device enrollment info of " +
-                    deviceType + " with id: " + deviceId;
+            String error = "Error occurred while retrieving the device enrollment info of requested " + deviceType + " device";
             log.error(error, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(error).build();
         }
@@ -687,9 +689,9 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
     @Consumes("application/json")
     @Produces("application/json")
     public Response createGeofence(GeofenceWrapper geofenceWrapper) {
-        RequestValidationUtil.validateGeofenceData(geofenceWrapper);
-        RequestValidationUtil.validateEventConfigurationData(geofenceWrapper.getEventConfig());
         try {
+            RequestValidationUtil.validateGeofenceData(geofenceWrapper);
+            RequestValidationUtil.validateEventConfigurationData(geofenceWrapper.getEventConfig());
             GeofenceData geofenceData = mapRequestGeofenceData(geofenceWrapper);
             GeoLocationProviderService geoService = DeviceMgtAPIUtils.getGeoService();
             if (!geoService.createGeofence(geofenceData)) {
@@ -699,6 +701,8 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
                         new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
             }
             return Response.status(Response.Status.CREATED).entity("Geo Fence record created successfully").build();
+        } catch (BadRequestException e){
+            return Response.status(Response.Status.BAD_REQUEST).entity(e.getMessage()).build();
         } catch (GeoLocationBasedServiceException e) {
             String msg = "Failed to create geofence";
             log.error(msg, e);
@@ -895,9 +899,9 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
     public Response updateGeofence(GeofenceWrapper geofenceWrapper,
             @PathParam("fenceId") int fenceId,
             @QueryParam("eventIds") int[] eventIds) {
-        RequestValidationUtil.validateGeofenceData(geofenceWrapper);
-        RequestValidationUtil.validateEventConfigurationData(geofenceWrapper.getEventConfig());
         try {
+            RequestValidationUtil.validateGeofenceData(geofenceWrapper);
+            RequestValidationUtil.validateEventConfigurationData(geofenceWrapper.getEventConfig());
             GeofenceData geofenceData = mapRequestGeofenceData(geofenceWrapper);
             GeoLocationProviderService geoService = DeviceMgtAPIUtils.getGeoService();
             if (!geoService.updateGeofence(geofenceData, fenceId)) {
@@ -912,6 +916,8 @@ public class GeoLocationBasedServiceImpl implements GeoLocationBasedService {
             geoService.updateGeoEventConfigurations(geofenceData, eventsToRemove,
                     geofenceData.getGroupIds(), fenceId);
             return Response.status(Response.Status.CREATED).entity("Geo Fence update successfully").build();
+        } catch (BadRequestException e){
+            return Response.status(Response.Status.BAD_REQUEST).entity(e.getMessage()).build();
         } catch (GeoLocationBasedServiceException e) {
             String msg = "Failed to update geofence";
             log.error(msg, e);

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/GroupManagementServiceImpl.java

@@ -165,7 +165,7 @@ public class GroupManagementServiceImpl implements GroupManagementService {
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (GroupAlreadyExistException e) {
-            String msg = "Group already exists with name " + group.getName() + ".";
+            String msg = "Group already exists with name : " + group.getName() + ".";
             log.warn(msg);
             return Response.status(Response.Status.CONFLICT).entity(msg).build();
         }
@@ -179,7 +179,7 @@ public class GroupManagementServiceImpl implements GroupManagementService {
             if (deviceGroup != null) {
                 return Response.status(Response.Status.OK).entity(deviceGroup).build();
             } else {
-                return Response.status(Response.Status.NOT_FOUND).build();
+                return Response.status(Response.Status.NOT_FOUND).entity("Group not found.").build();
             }
         } catch (GroupManagementException e) {
             String error = "Error occurred while getting the group.";
@@ -196,7 +196,7 @@ public class GroupManagementServiceImpl implements GroupManagementService {
             if (deviceGroup != null) {
                 return Response.status(Response.Status.OK).entity(deviceGroup).build();
             } else {
-                return Response.status(Response.Status.NOT_FOUND).build();
+                return Response.status(Response.Status.NOT_FOUND).entity("Group not found.").build();
             }
         } catch (GroupManagementException e) {
             String error = "Error occurred while getting the group.";
@@ -218,11 +218,11 @@ public class GroupManagementServiceImpl implements GroupManagementService {
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (GroupNotExistException e) {
-            String msg = "Group doesn't exist with ID '" + deviceGroup.getGroupId() + "'.";
+            String msg = "Group does not exist.";
             log.warn(msg);
             return Response.status(Response.Status.CONFLICT).entity(msg).build();
         } catch (GroupAlreadyExistException e) {
-            String msg = "Group already exists with name '" + deviceGroup.getName() + "'.";
+            String msg = "Group already exists with name : '" + deviceGroup.getName() + "'.";
             log.warn(msg);
             return Response.status(Response.Status.CONFLICT).entity(msg).build();
         }

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/PolicyManagementServiceImpl.java

@@ -83,8 +83,9 @@ public class PolicyManagementServiceImpl implements PolicyManagementService {
                 .validatePolicyDetails(policyWrapper);
         // validation failure results;
         if (!features.isEmpty()) {
-            log.error("Policy feature/s validation failed.");
-            return Response.status(Response.Status.BAD_REQUEST).entity(features).build();
+            String msg = "Policy feature/s validation failed." ;
+            log.error(msg);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg + " Features : " + features).build();
         }
         PolicyManagerService policyManagementService = DeviceMgtAPIUtils.getPolicyManagementService();
 
@@ -212,9 +213,8 @@ public class PolicyManagementServiceImpl implements PolicyManagementService {
             PolicyAdministratorPoint policyAdministratorPoint = policyManagementService.getPAP();
             policy = policyAdministratorPoint.getPolicy(id);
             if (policy == null) {
-                return Response.status(Response.Status.NOT_FOUND).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage(
-                                "No policy found with the id '" + id + "'").build()).build();
+                String msg = "Policy not found.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
         } catch (PolicyManagementException e) {
             String msg = "Error occurred while retrieving policy corresponding to the id '" + id + "'";
@@ -233,8 +233,9 @@ public class PolicyManagementServiceImpl implements PolicyManagementService {
                 .validatePolicyDetails(policyWrapper);
         // validation failure results;
         if (!features.isEmpty()) {
-            log.error("Policy feature/s validation failed.");
-            return Response.status(Response.Status.BAD_REQUEST).entity(features).build();
+            String msg = "Policy feature/s validation failed." ;
+            log.error(msg);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg + " Features : " + features).build();
         }
         PolicyManagerService policyManagementService = DeviceMgtAPIUtils.getPolicyManagementService();
         try {
@@ -296,10 +297,8 @@ public class PolicyManagementServiceImpl implements PolicyManagementService {
             //TODO:Check of this logic is correct
             String modifiedInvalidPolicyIds =
                     invalidPolicyIds.substring(0, invalidPolicyIds.length() - 1);
-            return Response.status(Response.Status.BAD_REQUEST).
-                    entity(new ErrorResponse.ErrorResponseBuilder().
-                            setMessage("Policies with the policy ID " + modifiedInvalidPolicyIds +
-                                       " doesn't exist").build()).build();
+            String msg = "Policies does not exist.";
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
     }
 
@@ -329,9 +328,8 @@ public class PolicyManagementServiceImpl implements PolicyManagementService {
             return Response.status(Response.Status.OK).entity("Selected policies have been successfully activated")
                     .build();
         } else {
-            return Response.status(Response.Status.NOT_FOUND).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage("Selected policies have " +
-                            "not been activated").build()).build();
+            String msg = "Selected policies have not been activated.";
+            return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         }
     }
 
@@ -361,9 +359,8 @@ public class PolicyManagementServiceImpl implements PolicyManagementService {
             return Response.status(Response.Status.OK).entity("Selected policies have been successfully " +
                     "deactivated").build();
         } else {
-            return Response.status(Response.Status.NOT_FOUND).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage("Selected policies have " +
-                            "not been deactivated").build()).build();
+            String msg = "Selected policies have not been activated.";
+            return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         }
     }
 
@@ -412,9 +409,8 @@ public class PolicyManagementServiceImpl implements PolicyManagementService {
                     + "updated.").build();
 
         } else {
-            return Response.status(Response.Status.NOT_FOUND).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setCode(400l).setMessage("Policy priorities did "
-                            + "not update. Bad Request.").build()).build();
+            String msg = "Policy priorities did not update. Bad Request.";
+            return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         }
     }
 
@@ -440,9 +436,8 @@ public class PolicyManagementServiceImpl implements PolicyManagementService {
             }
             policy = policyManagementService.getAppliedPolicyToDevice(device);
             if (policy == null) {
-                return Response.status(Response.Status.NOT_FOUND).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage(
-                                "No policy found for device ID '" + deviceId + "'"+ deviceId).build()).build();
+                String msg = "Policy not found for the requested device.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
         } catch (PolicyManagementException e) {
             String msg = "Error occurred while retrieving policy corresponding to the id '" + deviceType + "'"+ deviceId;
@@ -491,8 +486,9 @@ public class PolicyManagementServiceImpl implements PolicyManagementService {
                 = RequestValidationUtil.validateProfileFeatures(profileFeaturesList);
         // validation failure results;
         if (!features.isEmpty()) {
-            log.error("Policy feature/s validation failed.");
-            return Response.status(Response.Status.BAD_REQUEST).entity(features).build();
+            String msg = "Policy feature/s validation failed." ;
+            log.error(msg);
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg + " Features : " +features).build();
         }
         return Response.status(Response.Status.OK).entity("Valid request").build();
 

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/RoleManagementServiceImpl.java

@@ -169,8 +169,9 @@ public class RoleManagementServiceImpl implements RoleManagementService {
         try {
             final UserRealm userRealm = DeviceMgtAPIUtils.getUserRealm();
             if (!userRealm.getUserStoreManager().isExistingRole(roleName)) {
-                return Response.status(404).entity(new ErrorResponse.ErrorResponseBuilder().setMessage(
-                        "No role exists with the name '" + roleName + "'").build()).build();
+
+                String msg = "No role exists with the name : " + roleName ;
+                return Response.status(404).entity(msg).build();
             }
 
             final UIPermissionNode rolePermissions = this.getUIPermissionNode(roleName, userRealm);
@@ -249,9 +250,8 @@ public class RoleManagementServiceImpl implements RoleManagementService {
             final UserStoreManager userStoreManager = DeviceMgtAPIUtils.getUserStoreManager();
             final UserRealm userRealm = DeviceMgtAPIUtils.getUserRealm();
             if (!userStoreManager.isExistingRole(roleName)) {
-                return Response.status(404).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("No role exists with the name '" +
-                                roleName + "'").build()).build();
+                String msg = "No role exists with the name : " + roleName ;
+                return Response.status(404).entity(msg).build();
             }
             roleInfo.setRoleName(roleName);
             roleInfo.setUsers(userStoreManager.getUserListOfRole(roleName));
@@ -325,7 +325,7 @@ public class RoleManagementServiceImpl implements RoleManagementService {
             }
             if (ErrorMessages.ERROR_CODE_ROLE_ALREADY_EXISTS.getCode().equals(errorCode)) {
                 String roleName = roleInfo.getRoleName().split("/")[1];
-                String msg = "Role already exists with name " + roleName + ".";
+                String msg = "Role already exists with name : " + roleName + ". Try with another role name.";
                 log.warn(msg);
                 return Response.status(Response.Status.CONFLICT).entity(msg).build();
             } else {
@@ -354,10 +354,8 @@ public class RoleManagementServiceImpl implements RoleManagementService {
             roleName = userStoreName + "/" + roleName;
         }
         if (roles.size() < 2) {
-            return Response.status(400).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage("Combining Roles requires at least two roles.")
-                            .build()
-            ).build();
+            String msg = "Combining Roles requires at least two roles.";
+            return Response.status(400).entity(msg).build();
         }
         for (String role : roles) {
             RequestValidationUtil.validateRoleName(role);
@@ -374,9 +372,7 @@ public class RoleManagementServiceImpl implements RoleManagementService {
                     mergePermissions(new UIPermissionNode[]{getRolePermissions(role)}, permsSet);
                 }
             } catch (IllegalArgumentException e) {
-                return Response.status(404).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage(e.getMessage()).build()
-                ).build();
+                return Response.status(404).entity(e.getMessage()).build();
             }
 
             Permission[] permissions = permsSet.toArray(new Permission[permsSet.size()]);
@@ -424,9 +420,8 @@ public class RoleManagementServiceImpl implements RoleManagementService {
             final UserRealm userRealm = DeviceMgtAPIUtils.getUserRealm();
             final UserStoreManager userStoreManager = userRealm.getUserStoreManager();
             if (!userStoreManager.isExistingRole(roleName)) {
-                return Response.status(404).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("No role exists with the name '" +
-                                roleName + "'").build()).build();
+                String msg = "No role exists with the name : " + roleName ;
+                return Response.status(404).entity(msg).build();
             }
 
             final AuthorizationManager authorizationManager = userRealm.getAuthorizationManager();
@@ -481,10 +476,23 @@ public class RoleManagementServiceImpl implements RoleManagementService {
             return Response.status(Response.Status.OK).entity("Role '" + roleInfo.getRoleName() + "' has " +
                     "successfully been updated").build();
         } catch (UserStoreException e) {
-            String msg = "Error occurred while updating role '" + roleName + "'";
-            log.error(msg, e);
-            return Response.serverError().entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+            String errorCode = "";
+            String errorMessage = e.getMessage();
+            if (errorMessage != null && !errorMessage.isEmpty() &&
+                    errorMessage.contains(ErrorMessages.ERROR_CODE_ROLE_ALREADY_EXISTS.getCode())) {
+                errorCode = e.getMessage().split("-")[0].trim();
+            }
+            if (ErrorMessages.ERROR_CODE_ROLE_ALREADY_EXISTS.getCode().equals(errorCode)) {
+                String role = roleInfo.getRoleName().split("/")[1];
+                String msg = "Role already exists with name : " + role + ". Try with another role name.";
+                log.warn(msg);
+                return Response.status(Response.Status.CONFLICT).entity(msg).build();
+            }else{
+                String msg = "Error occurred while updating role '" + roleName + "'";
+                log.error(msg, e);
+                return Response.serverError().entity(
+                        new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+            }
         } catch (UserAdminException e) {
             String msg = "Error occurred while updating permissions of the role '" + roleName + "'";
             log.error(msg, e);
@@ -559,9 +567,8 @@ public class RoleManagementServiceImpl implements RoleManagementService {
             final UserRealm userRealm = DeviceMgtAPIUtils.getUserRealm();
             final UserStoreManager userStoreManager = userRealm.getUserStoreManager();
             if (!userStoreManager.isExistingRole(roleName)) {
-                return Response.status(404).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("No role exists with the name '" +
-                                roleName + "'").build()).build();
+                String msg = "No role exists with the name : " + roleName ;
+                return Response.status(404).entity(msg).build();
             }
 
             final AuthorizationManager authorizationManager = userRealm.getAuthorizationManager();

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/UserManagementServiceImpl.java

@@ -157,10 +157,8 @@ public class UserManagementServiceImpl implements UserManagementService {
                             " already exists. Therefore, request made to add user was refused.");
                 }
                 // returning response with bad request state
-                return Response.status(Response.Status.CONFLICT).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("User by username: " +
-                                userInfo.getUsername() + " already exists. Therefore, request made to add user " +
-                                "was refused.").build()).build();
+                String msg = "User by username: " + userInfo.getUsername() + " already exists. Try with another username." ;
+                return Response.status(Response.Status.CONFLICT).entity(msg).build();
             }
 
             String initialUserPassword;
@@ -290,9 +288,8 @@ public class UserManagementServiceImpl implements UserManagementService {
                 if (log.isDebugEnabled()) {
                     log.debug("User by username: " + username + " does not exist.");
                 }
-                return Response.status(Response.Status.NOT_FOUND).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage(
-                                "User doesn't exist.").build()).build();
+                String msg = "User by username: " + username + " does not exist.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
 
             BasicUserInfo user = this.getBasicUserInfo(username);
@@ -318,9 +315,8 @@ public class UserManagementServiceImpl implements UserManagementService {
                     log.debug("User by username: " + username +
                             " doesn't exists. Therefore, request made to update user was refused.");
                 }
-                return Response.status(Response.Status.NOT_FOUND).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("User by username: " +
-                                username + " doesn't  exist.").build()).build();
+                String msg = "User by username: " + username + " does not exist.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
 
             Map<String, String> defaultUserClaims =
@@ -396,9 +392,8 @@ public class UserManagementServiceImpl implements UserManagementService {
                 if (log.isDebugEnabled()) {
                     log.debug("User by username: " + username + " does not exist for removal.");
                 }
-                return Response.status(Response.Status.NOT_FOUND).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("User '" +
-                                username + "' does not exist for removal.").build()).build();
+                String msg = "User by username: " + username + " does not exist for removal.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
             // Un-enroll all devices for the user
             DeviceManagementProviderService deviceManagementService = DeviceMgtAPIUtils.getDeviceManagementService();
@@ -430,9 +425,8 @@ public class UserManagementServiceImpl implements UserManagementService {
                 if (log.isDebugEnabled()) {
                     log.debug("User by username: " + username + " does not exist for role retrieval.");
                 }
-                return Response.status(Response.Status.NOT_FOUND).entity(
-                        new ErrorResponse.ErrorResponseBuilder().setMessage("User by username: " + username +
-                                " does not exist for role retrieval.").build()).build();
+                String msg = "User by username: " + username + " does not exist for role retrieval.";
+                return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
             }
 
             RoleList result = new RoleList();
@@ -867,8 +861,8 @@ public class UserManagementServiceImpl implements UserManagementService {
             try {
                 ifSinceDate = format.parse(ifModifiedSince);
             } catch (ParseException e) {
-                return Response.status(400).entity(new ErrorResponse.ErrorResponseBuilder()
-                        .setMessage("Invalid date string is provided in 'If-Modified-Since' header").build()).build();
+                String msg = "Invalid date string is provided in [If-Modified-Since] header";
+                return Response.status(400).entity(msg).build();
             }
             ifModifiedSinceTimestamp = ifSinceDate.getTime();
             isIfModifiedSinceSet = true;
@@ -879,8 +873,8 @@ public class UserManagementServiceImpl implements UserManagementService {
             try {
                 sinceDate = format.parse(since);
             } catch (ParseException e) {
-                return Response.status(400).entity(new ErrorResponse.ErrorResponseBuilder()
-                        .setMessage("Invalid date string is provided in 'since' filter").build()).build();
+                String msg = "Invalid date string is provided in [since] filter";
+                return Response.status(400).entity(msg).build();
             }
             sinceTimestamp = sinceDate.getTime();
             timestamp = sinceTimestamp / 1000;
@@ -1094,8 +1088,7 @@ public class UserManagementServiceImpl implements UserManagementService {
             if (!userStoreManager.isExistingUser(username)) {
                 String message = "User by username: " + username + " does not exist for permission retrieval.";
                 log.error(message);
-                return Response.status(Response.Status.NOT_FOUND)
-                        .entity(new ErrorResponse.ErrorResponseBuilder().setMessage(message).build()).build();
+                return Response.status(Response.Status.NOT_FOUND).entity(message).build();
             }
             // Get a list of roles which the user assigned to
             List<String> roles = getFilteredRoles(userStoreManager, username);

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/admin/ApplicationManagementAdminServiceImpl.java

@@ -81,9 +81,8 @@ public class ApplicationManagementAdminServiceImpl implements ApplicationManagem
                         applicationWrapper.getDeviceIdentifiers().size() > 0) {
                     activity = appManagerConnector.installApplicationForDevices(operation, applicationWrapper.getDeviceIdentifiers());
                 } else {
-                    return Response.status(Response.Status.BAD_REQUEST).entity(
-                            new ErrorResponse.ErrorResponseBuilder().setMessage(
-                                    "No application installation criteria i.e. user/role/device is given").build()).build();
+                    String msg = "No application installation criteria i.e. user/role/device is given";
+                    return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
                 }
             }
             return Response.status(Response.Status.ACCEPTED).entity(activity).build();
@@ -131,9 +130,8 @@ public class ApplicationManagementAdminServiceImpl implements ApplicationManagem
                         applicationWrapper.getDeviceIdentifiers().size() > 0) {
                     activity = appManagerConnector.installApplicationForDevices(operation, applicationWrapper.getDeviceIdentifiers());
                 } else {
-                    return Response.status(Response.Status.BAD_REQUEST).entity(
-                            new ErrorResponse.ErrorResponseBuilder().setMessage(
-                                    "No application un-installation criteria i.e. user/role/device is given").build()).build();
+                    String msg = "No application un-installation criteria i.e. user/role/device is given";
+                    return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
                 }
             }
             return Response.status(Response.Status.ACCEPTED).entity(activity).build();

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/admin/DeviceManagementAdminServiceImpl.java

@@ -165,7 +165,7 @@ public class DeviceManagementAdminServiceImpl implements DeviceManagementAdminSe
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (UserNotFoundException e) {
-            String msg = "Couldn't found the owner in user store to update the owner of devices.";
+            String msg = "Could not found the owner in user store to update the owner of devices.";
             log.error(msg, e);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
@@ -194,8 +194,7 @@ public class DeviceManagementAdminServiceImpl implements DeviceManagementAdminSe
         catch (InvalidDeviceException e) {
             String msg = "Found Invalid devices";
             log.error(msg, e);
-            return Response.status(Response.Status.BAD_REQUEST).entity(
-                    new ErrorResponse.ErrorResponseBuilder().setMessage(msg).build()).build();
+            return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         }
     }
 
@@ -219,7 +218,7 @@ public class DeviceManagementAdminServiceImpl implements DeviceManagementAdminSe
             log.error(msg);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (BadRequestException e) {
-            String msg = "Bad request, can't proceed. Hence verify the request and re-try";
+            String msg = "Bad request, cannot proceed. Hence verify the request and re-try";
             log.error(msg);
             return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
         } catch (DeviceManagementException e) {
@@ -227,7 +226,7 @@ public class DeviceManagementAdminServiceImpl implements DeviceManagementAdminSe
             log.error(msg);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (DeviceNotFoundException e) {
-            String msg = "Couldn't find an device for device identifier: " + deviceIdentifier;
+            String msg = "Could not find an device";
             log.error(msg);
             return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         }

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/admin/GroupManagementAdminServiceImpl.java

@@ -156,7 +156,7 @@ public class GroupManagementAdminServiceImpl implements GroupManagementAdminServ
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (GroupAlreadyExistException e) {
-            String msg = "Group already exists with name " + group.getName() + ".";
+            String msg = "Group already exists with name : " + group.getName() + ". Try with another group name.";
             log.warn(msg);
             return Response.status(Response.Status.CONFLICT).entity(msg).build();
         }

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/util/RequestValidationUtil.java

@@ -43,6 +43,7 @@ import org.wso2.carbon.device.mgt.jaxrs.beans.PolicyWrapper;
 import org.wso2.carbon.device.mgt.jaxrs.beans.ProfileFeature;
 import org.wso2.carbon.device.mgt.jaxrs.beans.RoleInfo;
 import org.wso2.carbon.device.mgt.jaxrs.beans.Scope;
+import org.wso2.carbon.device.mgt.jaxrs.exception.BadRequestException;
 import org.wso2.carbon.device.mgt.jaxrs.util.Constants;
 import org.wso2.carbon.device.mgt.jaxrs.util.DeviceMgtAPIUtils;
 import org.wso2.carbon.policy.mgt.common.PolicyPayloadValidator;
@@ -711,8 +712,7 @@ public class RequestValidationUtil {
         if (geofenceWrapper.getFenceName() == null || geofenceWrapper.getFenceName().trim().isEmpty()) {
             String msg = "Geofence name should not be null or empty";
             log.error(msg);
-            throw new InputValidationException(
-                    new ErrorResponse.ErrorResponseBuilder().setCode(HttpStatus.SC_BAD_REQUEST).setMessage(msg).build());
+            throw new BadRequestException(msg);
         }
         if (geofenceWrapper.getGeoJson() != null && !geofenceWrapper.getGeoJson().trim().isEmpty()) {
             isGeoJsonExists = true;
@@ -720,26 +720,22 @@ public class RequestValidationUtil {
         if ((geofenceWrapper.getLatitude() < -90 || geofenceWrapper.getLatitude() > 90) && !isGeoJsonExists) {
             String msg = "Latitude should be a value between -90 and 90";
             log.error(msg);
-            throw new InputValidationException(
-                    new ErrorResponse.ErrorResponseBuilder().setCode(HttpStatus.SC_BAD_REQUEST).setMessage(msg).build());
+            throw new BadRequestException(msg);
         }
         if ((geofenceWrapper.getLongitude() < -180 || geofenceWrapper.getLongitude() > 180) && !isGeoJsonExists) {
             String msg = "Longitude should be a value between -180 and 180";
             log.error(msg);
-            throw new InputValidationException(
-                    new ErrorResponse.ErrorResponseBuilder().setCode(HttpStatus.SC_BAD_REQUEST).setMessage(msg).build());
+            throw new BadRequestException(msg);
         }
         if (geofenceWrapper.getRadius() < 1 && !isGeoJsonExists) {
             String msg = "Minimum radius of the fence should be 1m";
             log.error(msg);
-            throw new InputValidationException(
-                    new ErrorResponse.ErrorResponseBuilder().setCode(HttpStatus.SC_BAD_REQUEST).setMessage(msg).build());
+            throw new BadRequestException(msg);
         }
         if (geofenceWrapper.getFenceShape().trim().isEmpty()) {
             String msg = "Fence shape should not be empty";
             log.error(msg);
-            throw new InputValidationException(
-                    new ErrorResponse.ErrorResponseBuilder().setCode(HttpStatus.SC_BAD_REQUEST).setMessage(msg).build());
+            throw new BadRequestException(msg);
         }
     }
 
@@ -751,23 +747,20 @@ public class RequestValidationUtil {
         if (eventConfig == null ||eventConfig.isEmpty()) {
             String msg = "Event configuration is mandatory, since should not be null or empty";
             log.error(msg);
-            throw new InputValidationException(
-                    new ErrorResponse.ErrorResponseBuilder().setCode(HttpStatus.SC_BAD_REQUEST).setMessage(msg).build());
+            throw new BadRequestException(msg);
         }
 
         for (EventConfig config : eventConfig) {
             if (config.getActions() == null || config.getActions().isEmpty()) {
                 String msg = "Event actions are mandatory, since should not be null or empty";
                 log.error(msg);
-                throw new InputValidationException(
-                        new ErrorResponse.ErrorResponseBuilder().setCode(HttpStatus.SC_BAD_REQUEST).setMessage(msg).build());
+                throw new BadRequestException(msg);
             }
 
             if (config.getEventLogic() == null || config.getEventLogic().trim().isEmpty()) {
                 String msg = "Event logic is mandatory, since should not be null or empty";
                 log.error(msg);
-                throw new InputValidationException(
-                        new ErrorResponse.ErrorResponseBuilder().setCode(HttpStatus.SC_BAD_REQUEST).setMessage(msg).build());
+                throw new BadRequestException(msg);
             }
         }
     }

features/application-mgt/io.entgra.application.mgt.server.feature/src/main/resources/dbscripts/cdm/application-mgt/h2.sql

@@ -57,8 +57,8 @@ CREATE TABLE IF NOT EXISTS AP_APP_REVIEW(
   COMMENT TEXT NOT NULL,
   ROOT_PARENT_ID INTEGER NOT NULL,
   IMMEDIATE_PARENT_ID INTEGER NOT NULL,
-  CREATED_AT TIMESTAMP NOT NULL,
-  MODIFIED_AT TIMESTAMP NOT NULL,
+  CREATED_AT BIGINT NOT NULL,
+  MODIFIED_AT BIGINT NOT NULL,
   RATING INTEGER NULL,
   USERNAME VARCHAR(45) NOT NULL,
   ACTIVE_REVIEW BOOLEAN NOT NULL DEFAULT TRUE,

features/application-mgt/io.entgra.application.mgt.server.feature/src/main/resources/dbscripts/cdm/application-mgt/mssql.sql

@@ -58,8 +58,8 @@ CREATE TABLE AP_APP_REVIEW(
     COMMENT VARCHAR(max) NOT NULL,
     ROOT_PARENT_ID INTEGER NOT NULL,
     IMMEDIATE_PARENT_ID INTEGER NOT NULL,
-    CREATED_AT DATETIME2(0) NOT NULL,
-    MODIFIED_AT DATETIME2(0) NOT NULL,
+    CREATED_AT BIGINT NOT NULL,
+    MODIFIED_AT BIGINT NOT NULL,
     RATING INTEGER NULL,
     USERNAME VARCHAR(45) NOT NULL,
     ACTIVE_REVIEW BIT NOT NULL DEFAULT 1,

features/application-mgt/io.entgra.application.mgt.server.feature/src/main/resources/dbscripts/cdm/application-mgt/postgresql.sql

@@ -63,8 +63,8 @@ CREATE TABLE IF NOT EXISTS AP_APP_REVIEW(
     COMMENT TEXT NOT NULL,
     ROOT_PARENT_ID INTEGER NOT NULL,
     IMMEDIATE_PARENT_ID INTEGER NOT NULL,
-    CREATED_AT TIMESTAMP(0) DEFAULT CURRENT_TIMESTAMP NOT NULL,
-    MODIFIED_AT TIMESTAMP(0) DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    CREATED_AT BIGINT NOT NULL,
+    MODIFIED_AT BIGINT NOT NULL,
     RATING INTEGER NULL,
     USERNAME VARCHAR(45) NOT NULL,
     ACTIVE_REVIEW BOOLEAN NOT NULL DEFAULT TRUE,