No Persistence provider for EntityManager named

Question

I have my persistence.xml with the same name using TopLink under the META-INF directory. Then, I have my code calling it with:

Answer 1

There is another point: If you face this problem within an Eclipse RCP environment, you might have to change the Factory generation from Persistence.createEntityManagerFactory to new PersistenceProvider().createEntityManagerFactory

see ECF for a detailed discussion on this.