Caused by: java.lang.IllegalStateException: Inactive logical session handle called
    at net.sf.hibernate.jca.ManagedConnectionImpl.getSession(ManagedConnectionImpl.java:357)
...

   Session getSession(JCASessionImpl handle) {
      // JCA 1.0, 5.5.4
      // Ensure that there is at most one connection handle associated
      // actively with a ManagedConnection instance. [skiped] Any operations
      // on the ManagedConnection from any previously created connection
      // handles should result in an application level exception.

      // this might be pretty bad for performance, profile and find a
      // better way if it is really bad
      synchronized (handles) {
         if ( handles.size() > 0 && handles.get(0) == handle) {
            return session;
         }
         else {
            final String message = "Inactive logical session handle called";
            // cannot throw HibernateException because not all Session
            // methods throws it. This is incompatible with the spec!
            throw new IllegalStateException(message);
         }
      }
   }