illegally attempted to associate a proxy with two open Sessi

jcash · **Posted:** Fri Dec 02, 2005 8:54 am

Hibernate version:3.0

I have a deployed J2EE session bean that uses hibernate to access the database running on JBoss. This behaves normally when it is accessed by a single user, but when 2 concurrent users try to call it, I get the following HibernateException on an intermittent basis:

Quote:

org.hibernate.HibernateException: illegally attempted to associate a proxy with two open Sessions
at org.hibernate.proxy.AbstractLazyInitializer.setSession(AbstractLazyInitializer.java:68)
at org.hibernate.engine.PersistenceContext.reassociateProxy(PersistenceContext.java:485)
at org.hibernate.engine.PersistenceContext.reassociateIfUninitializedProxy(PersistenceContext.java:455)

The session bean gets an instance of the session factory in its ejbCreate method, as follows:

Code:

/**
* @ejb.create-method
* @ejb.transaction type="Required"
*/
public void ejbCreate() throws CreateException
{
   // Create hibernate session factory
   try
   {
      sessionFactory = new Configuration().configure().buildSessionFactory();
   }
   catch (HibernateException ex)
   {
      logger.error("HibernateException in method ejbCreate(). ", ex);
   }
}

I then use the session factory to create a session, within all methods within the session bean. In my scenario, a single method is being called simultaniously (or thereabouts) by both client applications.

Is this a known issue, or am I doing something silly?

jcash · **Posted:** Fri Dec 02, 2005 9:44 am

Fixed it. My domain facade was a singleton. This has been changed so that a new DomainFacade is created for every session (therefore a new session is created ofr every simultanious thread or application).