Erro grave com Hibernate e Glassfish 3.1

Galera alguém já teve esse erro ao inicializar o classfish 3.1

AVISO: Exception while dispatching an event org.hibernate.HibernateException: could not destruct listeners ... Caused by: java.lang.IllegalStateException: WEB9031: WebappClassLoader unable to load resource [org.hibernate.event.EventListeners$2], because it has not yet been started, or was already stopped at org.glassfish.web.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1410)

Até aí eu ainda consultar realizar consulta no banco.
Mas quando vou realizar um DML. Dá mais outros erros
como estes:

AVISO: A system exception occurred during an invocation on EJB ProjectRepository method public void sessionbeans.ProjectRepository.add(entities.Project) javax.ejb.EJBException at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5194) ... Caused by: java.lang.NullPointerException at com.sun.gjc.spi.base.PreparedStatementWrapper.close(PreparedStatementWrapper.java:783)

AVISO: #{projectMB.save}: javax.ejb.EJBException javax.faces.FacesException: #{projectMB.save}: javax.ejb.EJBException ... Caused by: javax.faces.el.EvaluationException: javax.ejb.EJBException at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102) at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) ... 32 more Caused by: javax.ejb.EJBException at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5194) at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5092)

E assim por diante…
o que poderia ser isto???

Obrigado!!!