Failed to deploy endpoint base point module

Question

I am working on an Android project that uses data from a Google data store. For this, I have a JSP and Servlet administration module that will be used to load data. To read data from an Android client application, I have cloud entry points.

Thus, I created a module containing JSPs, servlets, and cloud entry points. This works fine with a local dev server. The ability to access data through the Android application.

Now, trying to deploy the module to Google App Engine. But getting the following error:

SEVERE: Endpoint configuration not updated. The application returned an error while trying to Google Cloud Endpoints server with it.

What could be missing here?

Let me know if more information is needed for this problem.

Please help me in this regard.

Full trace:

/usr/lib/jvm/java-8-oracle/bin/java -Dfile.encoding=UTF-8 -classpath /root/.gradle/appengine-sdk/appengine-java-sdk-1.9.18/lib/appengine-tools-api.jar com.google.appengine.tools.admin.AppCfg --application=rotary-bidar-01 --version=1 --oauth2 --oauth2_client_secret=***** --oauth2_client_id=***** --oauth2_refresh_token=***** update /mnt/4CF2AADEF2AACC10/Projects/Rotary_Bidar/AndroidApplication/RotaryBidar/server/build/exploded-app
Reading application configuration data...
Jan 16, 2016 11:28:59 PM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
INFO: Successfully processed /mnt/4CF2AADEF2AACC10/Projects/Rotary_Bidar/AndroidApplication/RotaryBidar/server/build/exploded-app/WEB-INF/appengine-web.xml
Jan 16, 2016 11:28:59 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFO: Successfully processed /mnt/4CF2AADEF2AACC10/Projects/Rotary_Bidar/AndroidApplication/RotaryBidar/server/build/exploded-app/WEB-INF/web.xml


Beginning interaction for module default...
0% Created staging directory at: '/tmp/appcfg5838290850638628913.tmp'
5% Scanning for jsp files.
8% Compiling jsp files.
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: /tmp/1452967141068-0/org/apache/jsp/admin_jsp.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Jan 16, 2016 11:29:10 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFO: Successfully processed /tmp/appcfg5838290850638628913.tmp/WEB-INF/web.xml
20% Scanning files on local disk.
25% Initiating update.
28% Cloning 13 static files.
31% Cloning 50 application files.
40% Uploading 2 files.
52% Uploaded 1 files.
61% Uploaded 2 files.
68% Initializing precompilation...
73% Sending batch containing 2 file(s) totaling 1KB.
90% Deploying new version.
95% Will check again in 1 seconds.
98% Will check again in 2 seconds.
99% Will check again in 4 seconds.
99% Will check again in 8 seconds.
99% Will check again in 16 seconds.
99% Will check again in 32 seconds.
99% Endpoints configuration not updated.  The app returned an error when the Google Cloud Endpoints server attempted to communicate with it.
Jan 16, 2016 11:30:32 PM com.google.appengine.tools.admin.AppVersionUpload checkEndpointsServingStatusResult
99% See the deployment troubleshooting documentation for more information: https://developers.google.com/appengine/docs/java/endpoints/test_deploy#troubleshooting_a_deployment_failure
SEVERE: Endpoints configuration not updated.  The app returned an error when the Google Cloud Endpoints server attempted to communicate with it.
99% Ignoring Endpoints failure and proceeding with update.
99% Closing update: new version is ready to start serving.
99% Uploading index definitions.

Update for module default completed successfully.
Success.
Cleaning up temporary files for module default...