Add app name length validation condition to the applicationManagmentimpl file

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

@@ -3445,6 +3445,11 @@ public class ApplicationManagerImpl implements ApplicationManager {
                 log.error(msg);
                 throw new BadRequestException(msg);
             }
+            if (appName.length() > 20) {
+                String msg = "Application name must be less than or equal to 20 characters in length.";
+                log.error(msg);
+                throw new BadRequestException(msg);
+            }
             appCategories = applicationWrapper.getCategories();
             if (appCategories == null) {
                 String msg = "Application category can't be null.";

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

@@ -371,24 +371,28 @@ public class ApplicationManagementPublisherAPIImpl implements ApplicationManagem
             if (appName == null) {
                 String msg = "Invalid app name, appName query param cannot be empty/null.";
                 log.error(msg);
-                return Response.status(Response.Status.BAD_REQUEST).build();
+                return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
             }
             if (appName.length() > 20) {
                 String msg = "Invalid app name, maximum length of the application name should be 20 characters.";
                 log.error(msg);
-                return Response.status(Response.Status.BAD_REQUEST).build();
+                return Response.status(Response.Status.BAD_REQUEST).entity(msg).build();
             }
             ApplicationManager applicationManager = APIUtil.getApplicationManager();
             if (applicationManager.isExistingAppName(appName, deviceType)) {
-                return Response.status(Response.Status.CONFLICT).build();
+                String msg = "Invalid app name, app name already exists.";
+                log.error(msg);
+                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 = "Found invalid device type to check application existence.";
+            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();
         }
     }