Are EJB3 session bean calls always in the same thread?

[bsonrisa]

Suppose you have a class like this:

public class MyEJB {

     @EJB
     public OtherEJBLocal other;

     public void callSomething() {
          other.callAnotherMethod();
     }
}

Will the method call on the second EJB necessarily run in the same thread as the initial call to MyEJB.callSomething() ? What if the second EJB is a singleton?

I'm asking because I want to use thread-local Hibernate sessions (using sessionFactory.getCurrentSession() ). For various legacy-code reasons, we cannot use JTA transations or CMT.