Hibernate Mentawai

//MeuEspaco.addUsuario
        this.action( "MeuEspaco" , MeuEspacoAction.class , "addPessoa" )
			.on( MeuEspacoAction.SUCCESS , fwd( "MeuEspaco.pessoaCadastrada.jsp" ) );

public String addPessoa() throws Exception {
		Pessoa pessoa = new Pessoa();
		pessoa.setNome( input.getStringValue( "nome" ) );
		HibernatePessoaDAO pessoaDAO = new HibernatePessoaDAO();
		try{
			pessoaDAO.inserir( pessoa );
		}catch( Exception e ){

		}		
		return SUCCESS;
	}

public void inserir( Pessoa pessoa ) throws Exception {
		Session session = HibernateUtil.currentSession();
		Transaction transaction = session.beginTransaction();
		//Object r = null;
		try{
			//r = session.save( pessoa );
			session.save( pessoa );
			transaction.commit();
			//return (Long) r; 
		}catch( Exception e ){
			transaction.rollback();
			System.out.println( e.toString() );
		}finally {
			HibernateUtil.closeSession();
		}		
		//return null;
	}

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: java.lang.reflect.InvocationTargetException
	org.mentawai.core.Controller.service(Controller.java:313)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause 

org.mentawai.core.ActionException: java.lang.reflect.InvocationTargetException
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	java.lang.reflect.Method.invoke(Unknown Source)
	org.mentawai.core.InvocationChain.invoke(InvocationChain.java:105)
	org.mentawai.core.Controller.invokeAction(Controller.java:340)
	org.mentawai.core.Controller.service(Controller.java:288)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.