Question

I’m writing a rather simple application that uses GWT, Hibernate and Google Guice (with GIN). What I wanted to do is to have transactions managed using external manager (like using @Transactional in Spring), instead of using EntityManager#getTransaction. I tried using @Transactional, but it doesn’t seem to work for me.

I have EntityManager already injected using Providers, like this:

/* import stuff */

public class DbProvider implements Provider<EntityManager> {

    public EntityManager get() {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("persdb");
        return emf.createEntityManager();
    }

}

It seems to work properly when managing the transactions manually. I wanted to have transactions managed automatically, also for making the automated test with DBUnit.

Does anyone know how to solve that?

Answer 1

Having @Transactional work in Guice requires three things:

• You need guice-persist.jar in your classpath
• The object on which the @Transactional methods are called must be created by Guice
• The methods must not be private