diff --git a/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/AppLifecycleState.java b/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/AppLifecycleState.java
index 3d44c6b54b0..8c0c1cbc872 100644
--- a/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/AppLifecycleState.java
+++ b/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/AppLifecycleState.java
@@ -1,5 +1,5 @@
 /*
- *   Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+ *   Copyright (c) 2018, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
  *
  *   WSO2 Inc. licenses this file to you under the Apache License,
  *   Version 2.0 (the "License"); you may not use this file except
diff --git a/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/SortingOrder.java b/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/SortingOrder.java
index 88738dd9535..3dd314de962 100644
--- a/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/SortingOrder.java
+++ b/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/SortingOrder.java
@@ -1,5 +1,5 @@
 /*
- *   Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+ *   Copyright (c) 2018, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
  *
  *   WSO2 Inc. licenses this file to you under the Apache License,
  *   Version 2.0 (the "License"); you may not use this file except
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 f79c1d1d05a..b2bcac32017 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
@@ -175,7 +175,10 @@ public class ApplicationManagerImpl implements ApplicationManager {
         } catch (UserStoreException e) {
             throw new ApplicationManagementException(
                     "User-store exception while checking whether the user " + userName + " of tenant " + tenantId
-                            + " has the publisher permission");
+                            + " has the publisher permission", e);
+        } catch (ApplicationManagementDAOException e) {
+            throw new ApplicationManagementException(
+                    "DAO exception while getting applications for the user " + userName + " of tenant " + tenantId, e);
         } finally {
             ConnectionManagerUtil.closeDBConnection();
         }
@@ -526,14 +529,15 @@ public class ApplicationManagerImpl implements ApplicationManager {
         ApplicationRelease applicationRelease = DataHolder.getInstance().getApplicationReleaseManager()
                 .getReleaseByUuid(applicationUuid);
         if (applicationRelease == null) {
-            throw new NotFoundException(
+            throw new ApplicationManagementException(
                     "Application with UUID " + applicationUuid + " does not exist.");
         }
         return applicationRelease;
     }
 
     @Override
-    public ApplicationRelease updateRelease(int appId, ApplicationRelease applicationRelease) throws ApplicationManagementException {
+    public ApplicationRelease updateRelease(int appId, ApplicationRelease applicationRelease) throws
+            ApplicationManagementException {
         return null;
     }
 
@@ -787,17 +791,15 @@ public class ApplicationManagerImpl implements ApplicationManager {
                     !SortingOrder.DESC.toString().equals(filter.getSortBy())) {
                 return null;
             }
-
-
             if (filter.getAppType() != null) {
                 Boolean isValidRequest = false;
-                for (ApplicationType applicationType: ApplicationType.values()){
-                    if(applicationType.toString().equals(filter.getAppType())){
+                for (ApplicationType applicationType : ApplicationType.values()) {
+                    if (applicationType.toString().equals(filter.getAppType())) {
                         isValidRequest = true;
                         break;
                     }
                 }
-                if (!isValidRequest){
+                if (!isValidRequest) {
                     return null;
                 }
             }
diff --git a/components/application-mgt/org.wso2.carbon.device.application.mgt.publisher.api/src/main/java/org/wso2/carbon/device/application/mgt/publisher/api/services/impl/ApplicationManagementAPIImpl.java b/components/application-mgt/org.wso2.carbon.device.application.mgt.publisher.api/src/main/java/org/wso2/carbon/device/application/mgt/publisher/api/services/impl/ApplicationManagementAPIImpl.java
index 3786381cfca..5f8f2bbc312 100644
--- a/components/application-mgt/org.wso2.carbon.device.application.mgt.publisher.api/src/main/java/org/wso2/carbon/device/application/mgt/publisher/api/services/impl/ApplicationManagementAPIImpl.java
+++ b/components/application-mgt/org.wso2.carbon.device.application.mgt.publisher.api/src/main/java/org/wso2/carbon/device/application/mgt/publisher/api/services/impl/ApplicationManagementAPIImpl.java
@@ -24,6 +24,7 @@ import org.apache.cxf.jaxrs.ext.multipart.Attachment;
 import org.apache.cxf.jaxrs.ext.multipart.Multipart;
 import org.wso2.carbon.device.application.mgt.common.*;
 import org.wso2.carbon.device.application.mgt.common.exception.ApplicationStorageManagementException;
+import org.wso2.carbon.device.application.mgt.core.exception.ValidationException;
 import org.wso2.carbon.device.application.mgt.publisher.api.APIUtil;
 import org.wso2.carbon.device.application.mgt.publisher.api.services.ApplicationManagementAPI;
 import org.wso2.carbon.device.application.mgt.common.exception.ApplicationManagementException;
@@ -58,12 +59,10 @@ public class ApplicationManagementAPIImpl implements ApplicationManagementAPI {
 
     private static Log log = LogFactory.getLog(ApplicationManagementAPIImpl.class);
 
-
     @GET
     @Override
     @Consumes("application/json")
-    public Response getApplications(
-            @Valid Filter filter) {
+    public Response getApplications(@Valid Filter filter) {
         ApplicationManager applicationManager = APIUtil.getApplicationManager();
 
         try {
@@ -73,9 +72,7 @@ public class ApplicationManagementAPIImpl implements ApplicationManagementAPI {
                         ("Couldn't find any application for requested query.").build();
             }
             return Response.status(Response.Status.OK).entity(applications).build();
-        } catch (NotFoundException e) {
-            return Response.status(Response.Status.NOT_FOUND).build();
-        } catch (ApplicationManagementException e) {
+        }  catch (ApplicationManagementException e) {
             String msg = "Error occurred while getting the application list for publisher ";
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();