Comment by alex.che...@gmail.com:

I'm using the following solution for the problem mentioned above (my msg dated Feb 4, 2012).

I've bound an Interceptor for method returning an EntityManager? in my main module:
{{{
        bindInterceptor(Matchers.subclassesOf(PersistService.class),
                Matchers.returns(Matchers.identicalTo(EntityManager.class)),
                new EntityManagerTuner()
        );
}}}

In an interceptor i'm enabling the desired behavior before returning the EntityManager
{{{
public class EntityManagerTuner implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        Object result = invocation.proceed();
        if (result instanceof EntityManagerImpl) {
            EntityManagerImpl castedEm = (EntityManagerImpl) result;
            ((SessionImpl) castedEm.getSession()).setAutoClear(true);
        }
        return result;
    }
}
}}}
Quite rough but works ) Hope this will help.

For more information:
http://code.google.com/p/google-guice/wiki/JPA

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