Improve metadata API

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

@@ -189,10 +189,6 @@ public interface MetadataService {
                                             description = "Date and time the resource was last modified.\n" +
                                                     "Used by caches, or in conditional requests."),
                             }),
-                    @ApiResponse(
-                            code = 404,
-                            message = "Not Found. \n The requested metadata entry is not found.",
-                            response = ErrorResponse.class),
                     @ApiResponse(
                             code = 500,
                             message = "Internal Server Error. " +

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

@@ -89,10 +89,6 @@ public class MetadataServiceImpl implements MetadataService {
         try {
             metadata = DeviceMgtAPIUtils.getMetadataManagementService().retrieveMetadata(metaKey);
             return Response.status(Response.Status.OK).entity(metadata).build();
-        } catch (MetadataKeyNotFoundException e) {
-            String msg = "Metadata entry metaKey:" + metaKey + " is not found.";
-            log.error(msg, e);
-            return Response.status(Response.Status.NOT_FOUND).entity(msg).build();
         } catch (MetadataManagementException e) {
             String msg = "Error occurred while getting the metadata entry for metaKey:" + metaKey;
             log.error(msg, e);

components/device-mgt/org.wso2.carbon.device.mgt.common/src/main/java/org/wso2/carbon/device/mgt/common/metadata/mgt/MetadataManagementService.java

@@ -47,9 +47,8 @@ public interface MetadataManagementService {
      * @param metaKey   a string to be search against the Metadata.metaKey
      * @return          the Metadata entry for specified Metadata.metaKey
      * @throws MetadataManagementException     If a data source related exception occurred
-     * @throws MetadataKeyNotFoundException    If the provided Metadata.metaKey not found
      */
-    Metadata retrieveMetadata(String metaKey) throws MetadataManagementException, MetadataKeyNotFoundException;
+    Metadata retrieveMetadata(String metaKey) throws MetadataManagementException;
 
     /**
      * Get all Metadata entries.

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/metadata/mgt/MetadataManagementServiceImpl.java

@@ -85,20 +85,14 @@ public class MetadataManagementServiceImpl implements MetadataManagementService
     }
 
     @Override
-    public Metadata retrieveMetadata(String metaKey) throws MetadataManagementException, MetadataKeyNotFoundException {
+    public Metadata retrieveMetadata(String metaKey) throws MetadataManagementException {
         if (log.isDebugEnabled()) {
             log.debug("Retrieving Metadata for metaKey:" + metaKey);
         }
         try {
             MetadataManagementDAOFactory.openConnection();
-            Metadata metadata = metadataDAO.getMetadata(
+            return metadataDAO.getMetadata(
                     PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true), metaKey);
-            if (metadata == null) {
-                String msg = "Specified Metadata entry has not found. {metaKey:" + metaKey + "}";
-                log.error(msg);
-                throw new MetadataKeyNotFoundException(msg);
-            }
-            return metadata;
         } catch (MetadataManagementDAOException e) {
             String msg = "Error occurred while retrieving the metadata entry for metaKey:" + metaKey;
             log.error(msg, e);

components/policy-mgt/org.wso2.carbon.policy.mgt.core/src/main/java/org/wso2/carbon/policy/mgt/core/mgt/impl/PolicyManagerImpl.java

@@ -872,6 +872,7 @@ public class PolicyManagerImpl implements PolicyManager {
 
     @Override
     public List<Policy> getPolicies() throws PolicyManagementException {
+
         List<Policy> policyList;
         List<Profile> profileList;
         try {