No EntityManager transaction with Spring/EclipseLink

Question

In my Spring Data JPA application, I switched from Hibernate to EclipseLink only to find out that now the EntityManager instances are not part of the transactions anymore, and therefore no data gets inserted when calling persist() .

If I manually call entityManager.joinTransaction() it works, but that's surely not meant to be the solution.

I created a sample project that allows reproducing the problem: https://github.com/micheljung/eclipselink-no-transaction Pay attention to how it does not print an INSERT statement in the console, and how the ID of the saved entity stays null :

ID of saved entity: null

If you include Hibernate and exclude EclipseLink, it works:

Hibernate: insert into greeting (id, greeting) values (null, ?)
ID of saved entity: 1

I already spent the last 3h reading all related Blogs and SO posts, but none of the results revealed any problem.

Any help is very much appreciated.

Answer 1

Add

eclipselink.ddl-generation: drop-and-create-tables

to your JPA properties (otherwise the GREETING table doesn'† exist),

and add

@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory emf) {
    return new JpaTransactionManager(emf);
}

to your EclipseLinkNoTransactionApplication class.