javax.persistence.PersistenceException: No persistence providers available for "transactions-optional" after trying the following discovered implementations: org.datanucleus.api.jpa.PersistenceProviderImpl

[Aadil Farooqui]

Hi,

I am new using Google App Engine, I am following the tutorial http://www.vogella.com/tutorials/GoogleAppEngineJava/article.html to learn it.

I am continuously getting this error when I run the application. 

NOTE: I have read almost all the posts for this, but couldn't find any solution for this problem:

http://stackoverflow.com/questions/16551302/cant-get-application-made-with-google-app-engine-to-run

http://stackoverflow.com/questions/16482385/google-app-engine-jpa-java-server-faces-uncaught-exception-from-servlet-java-l

Can someone provide a suitable solution for this problem? The error is on the line:

private static final EntityManagerFactory emfInstance = Persistence.createEntityManagerFactory("transactions-optional");

and

EntityManager em = EMFService.get().createEntityManager();

Thanks..

[Vinny P]

On Wed, Apr 9, 2014 at 6:11 AM, Aadil Farooqui <aadil.m...@gmail.com> wrote:

I am new using Google App Engine, I am following the tutorial http://www.vogella.com/tutorials/GoogleAppEngineJava/article.html to learn 

That tutorial is quite old, and I don't believe the author supports it anymore.

I suggest using the official Java tutorial, available at https://developers.google.com/appengine/docs/java/gettingstarted/introduction . From there you can investigate further sample applications at https://github.com/GoogleCloudPlatform/ 

 

 

-----------------

-Vinny P

Technology & Media Advisor

Chicago, IL

App Engine Code Samples: http://www.learntogoogleit.com