Exception Description: Cannot use an EntityTransaction while using JTA.
at org.eclipse.persistence.internal.jpa.transaction.JTATransactionWrapper.getTransaction(JTATransactionWrapper.java:65)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.getTransaction(EntityManagerImpl.java:1192)
at org.eclipse.emf.texo.server.store.EntityManagerObjectStore.begin(EntityManagerObjectStore.java:209)
at org.eclipse.emf.texo.server.service.ModelOperation.execute(ModelOperation.java:46)
at org.eclipse.emf.texo.server.web.WebServiceHandler.doGet(WebServiceHandler.java:89)
at org.eclipse.emf.texo.server.web.WebServiceServlet.doGet(WebServiceServlet.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)

He Jon,
Indeed this needs to be extended/changed, you configure the JTA transactions using jndi?

Maybe you want to help to get this working for Texo. The idea is to implement a subclass of EntityManagerObjectStore and
override the begin, commit and rollback methods. These methods should then work in the correct way for JTA (either start
a new transaction or join a transaction). Then you can tell Texo to use the JTAEntityManagerObjectStore by doing this
when the application starts:
ComponentProvider.getInstance().register(EntityManagerObjectStore.class, JTAEntityManagerObjectStore.class);

Let me know what you think about this.

gr. Martin

Hi Jon,
You were entirely correct in this approach :-). I think if the transaction is managed by the container then the object
store should not touch it. So looks fine to me. You can try to update through the webservice and see if the transaction
commits.

But if the transaction is/should be managed by the objectstore then something like this can maybe work:

public class JTAEntityManagerObjectStore {

private UserTransaction userTransaction;

public void begin() {
InitialContext initCtx = new InitialContext();
userTransaction = (UserTransaction)initCtx.lookup(
"java:comp/UserTransaction");
userTransaction.begin();
getEntityManager().joinTransaction();
}

public void commit() {
userTransaction.commit();
}

public void rollback() {
userTransaction.rollback();
}

public void close() {
userTransaction = null;
super.close();
}
}

He Jon,
No problem, you can ask anything you want!

You maybe have seen this blog post:
i'm not allowed to post links

The JSONTexoResource is not yet implemented, it is a to-do for me to get this done.... Will be a few weeks before I have
more time for it...

So maybe you can make use of the TexoResource as it is described in the blog post.

The example1.rcp makes use of the EPersistenceService for retrieving EObjects through jpa.