diff --git a/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/common/Util.java b/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/common/Util.java
index fdfd431925..ed27d1a24d 100644
--- a/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/common/Util.java
+++ b/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/dao/common/Util.java
@@ -63,12 +63,13 @@ public class Util {
 
         while (rs.next()) {
             if (applicationId != rs.getInt("APP_ID")) {
-
                 if (application != null) {
                     applications.add(application);
                 }
                 applicationId = rs.getInt("APP_ID");
                 application = new Application();
+                application.setTags(new ArrayList<>());
+                application.setUnrestrictedRoles(new ArrayList<>());
                 application.setId(applicationId);
                 application.setName(rs.getString("APP_NAME"));
                 application.setType(rs.getString("APP_TYPE"));
@@ -76,23 +77,25 @@ public class Util {
                 application.setSubType(rs.getString("SUB_TYPE"));
                 application.setPaymentCurrency(rs.getString("CURRENCY"));
                 application.setIsRestricted(rs.getBoolean("RESTRICTED"));
-
-                List<String> tags = new ArrayList<>();
-                tags.add(rs.getString("APP_TAG").toLowerCase());
-                application.setTags(tags);
-
-                List<String> unrestrictedRoles = new ArrayList<>();
-                unrestrictedRoles.add(rs.getString("ROLE").toLowerCase());
-                application.setUnrestrictedRoles(unrestrictedRoles);
-            } else {
-                String tag = rs.getString("APP_TAG").toLowerCase();
-                String unrestrictedRole = rs.getString("ROLE").toLowerCase();
-                if (application != null && !application.getTags().contains(tag)) {
+                String tag = rs.getString("APP_TAG");
+                String unrestrictedRole = rs.getString("ROLE");
+                if (tag != null) {
                     application.getTags().add(tag);
                 }
-                if (application != null && !application.getUnrestrictedRoles().contains(unrestrictedRole)) {
+                if (unrestrictedRole != null) {
                     application.getUnrestrictedRoles().add(unrestrictedRole);
                 }
+            } else {
+                String tag = rs.getString("APP_TAG");
+                String unrestrictedRole = rs.getString("ROLE");
+                if (application != null) {
+                    if (tag != null && !application.getTags().contains(tag)) {
+                        application.getTags().add(tag);
+                    }
+                    if (unrestrictedRole != null && !application.getUnrestrictedRoles().contains(unrestrictedRole)) {
+                        application.getUnrestrictedRoles().add(unrestrictedRole);
+                    }
+                }
             }
             if (rs.last()) {
                 applications.add(application);
@@ -119,6 +122,8 @@ public class Util {
             while (rs.next()) {
                 if (iteration == 0) {
                     application = new Application();
+                    application.setTags(new ArrayList<>());
+                    application.setUnrestrictedRoles(new ArrayList<>());
                     applicatioId = rs.getInt("APP_ID");
                     application.setId(applicatioId);
                     application.setName(rs.getString("APP_NAME"));
@@ -130,13 +135,12 @@ public class Util {
                     application.setDeviceTypeId(rs.getInt("DEVICE_TYPE_ID"));
                 }
 
-                String tag = rs.getString("APP_TAG").toLowerCase();
-                String unrestrictedRole = rs.getString("ROLE").toLowerCase();
-                if (application.getTags() != null && application.getTags().contains(tag)) {
+                String tag = rs.getString("APP_TAG");
+                String unrestrictedRole = rs.getString("ROLE");
+                if (tag != null && !application.getTags().contains(tag)) {
                     application.getTags().add(tag);
                 }
-                if (application.getUnrestrictedRoles() != null && application.getUnrestrictedRoles()
-                        .contains(unrestrictedRole)) {
+                if (unrestrictedRole != null && !application.getUnrestrictedRoles().contains(unrestrictedRole)) {
                     application.getUnrestrictedRoles().add(unrestrictedRole);
                 }
                 iteration++;
diff --git a/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/ApplicationManagerImpl.java b/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/ApplicationManagerImpl.java
index cc95db446f..c3718c1df9 100644
--- a/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/ApplicationManagerImpl.java
+++ b/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/ApplicationManagerImpl.java
@@ -100,17 +100,15 @@ public class ApplicationManagerImpl implements ApplicationManager {
         if (log.isDebugEnabled()) {
             log.debug("Create Application received for the tenant : " + tenantId + " From" + " the user : " + userName);
         }
-
-        ConnectionManagerUtil.openDBConnection();
         validateAppCreatingRequest(application, tenantId);
         validateAppReleasePayload(application.getApplicationReleases().get(0));
         DeviceType deviceType;
         ApplicationRelease applicationRelease;
         List<ApplicationRelease> applicationReleases = new ArrayList<>();
         try {
-            ConnectionManagerUtil.beginDBTransaction();
             // Getting the device type details to get device type ID for internal mappings
             deviceType = Util.getDeviceManagementService().getDeviceType(application.getDeviceType());
+            ConnectionManagerUtil.beginDBTransaction();
 
             if (deviceType == null) {
                 log.error("Device type is not matched with application type");
@@ -165,7 +163,8 @@ public class ApplicationManagerImpl implements ApplicationManager {
                 LifecycleState lifecycleState = new LifecycleState();
                 lifecycleState.setCurrentState(AppLifecycleState.CREATED.toString());
                 lifecycleState.setPreviousState(AppLifecycleState.CREATED.toString());
-                changeLifecycleState(appId, applicationRelease.getUuid(), lifecycleState, false);
+                lifecycleState.setUpdatedBy(userName);
+                this.lifecycleStateDAO.addLifecycleState(lifecycleState, appId, applicationRelease.getUuid(), tenantId);
 
                 applicationRelease.setLifecycleState(lifecycleState);
                 applicationReleases.add(applicationRelease);
@@ -192,8 +191,6 @@ public class ApplicationManagerImpl implements ApplicationManager {
             log.error(msg, e);
             ConnectionManagerUtil.rollbackDBTransaction();
             throw new ApplicationManagementException(msg, e);
-        } finally {
-            ConnectionManagerUtil.closeDBConnection();
         }
     }
 
@@ -693,19 +690,30 @@ public class ApplicationManagerImpl implements ApplicationManager {
      * @param application Application that need to be validated
      * @throws ValidationException Validation Exception
      */
-    private void validateApplicationExistence(Application application, int tenantId) throws ApplicationManagementException {
+    private void validateApplicationExistence(Application application, int tenantId)
+            throws ApplicationManagementException {
         Filter filter = new Filter();
         filter.setFullMatch(true);
         filter.setAppName(application.getName().trim());
         filter.setOffset(0);
         filter.setLimit(1);
+        try {
+            ConnectionManagerUtil.openDBConnection();
+            ApplicationList applicationList = applicationDAO.getApplications(filter, tenantId);
+            if (applicationList != null && applicationList.getApplications() != null && !applicationList
+                    .getApplications().isEmpty()) {
+                throw new ApplicationManagementException(
+                        "Already an application registered with same name - " + applicationList.getApplications().get(0)
+                                .getName());
+            }
+        } catch (DBConnectionException e) {
+            throw new ApplicationManagementException("test 1");
 
-        ApplicationList applicationList = applicationDAO.getApplications(filter, tenantId);
-        if (applicationList != null && applicationList.getApplications() != null && !applicationList.getApplications()
-                .isEmpty()) {
-            throw new ApplicationManagementException(
-                    "Already an application registered with same name - " + applicationList.getApplications().get(0)
-                            .getName());
+        } catch (ApplicationManagementDAOException e) {
+            throw new ApplicationManagementException("test 2");
+
+        } finally {
+            ConnectionManagerUtil.closeDBConnection();
         }
     }