Erro ao acessar pagina JSF ...javax.servlet.ServletException: javax.servlet.ServletException: n

Front-end
#1

Erro ao acessar pagina JSF …javax.servlet.ServletException: javax.servlet.ServletException: null source
financeiro.web.filter.ConexaoHibernateFilter.doFilter(ConexaoHibernateFilter.java:44)

Ao digitar no browser :

http://localhost:8080/FinanceiroWeb/restrito/conta.jsf

me da o erro abaixo


TTP Status 500 -

type Exception report

message

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

exception

javax.servlet.ServletException: javax.servlet.ServletException: null source
	financeiro.web.filter.ConexaoHibernateFilter.doFilter(ConexaoHibernateFilter.java:44)

root cause

javax.servlet.ServletException: null source
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:321)
	financeiro.web.filter.ConexaoHibernateFilter.doFilter(ConexaoHibernateFilter.java:32)

root cause

java.lang.IllegalArgumentException: null source
	java.util.EventObject.<init>(Unknown Source)
	javax.faces.event.SystemEvent.<init>(SystemEvent.java:67)
	javax.faces.event.ComponentSystemEvent.<init>(ComponentSystemEvent.java:69)
	javax.faces.event.PostRestoreStateEvent.<init>(PostRestoreStateEvent.java:69)
	com.sun.faces.lifecycle.RestoreViewPhase.deliverPostRestoreStateEvent(RestoreViewPhase.java:256)
	com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:245)
	com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
	com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:107)
	com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
	financeiro.web.filter.ConexaoHibernateFilter.doFilter(ConexaoHibernateFilter.java:32)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.4 logs.
Apache Tomcat/7.0.4

pagina.xhtml

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
	xmlns:ui="http://java.sun.com/jsf/facelets"
	xmlns:c="http://java.sun.com/jsp/jstl/core"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:f="http://java.sun.com/jsf/core"
	xmlns:sec="http://www.springframework.org/security/facelets/tags"
	>

<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Cadastro de contas</title>
<h:/head>


<h:body>

  <h1>Cadastro de contas</h1>
<h:/body>
</html>

ConexaoHibernateFilter.java


import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.hibernate.SessionFactory;

import financeiro.util.HibernateUtil;

public class ConexaoHibernateFilter implements Filter{
    private SessionFactory sf;
	
	public void init(FilterConfig arg0) throws ServletException {
       this.sf = HibernateUtil.getSessionfactory();	
 	}

	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
			FilterChain chain) throws IOException, ServletException {
		try {
			 this.sf.getCurrentSession().beginTransaction();
		        chain.doFilter(servletRequest, servletResponse);
		        this.sf.getCurrentSession().getTransaction().commit();
		        this.sf.getCurrentSession().close();
				
		} catch (Throwable ex) {
			try {
				if(this.sf.getCurrentSession().getTransaction().isActive()){
		        	   this.sf.getCurrentSession().getTransaction().rollback();
		           }
			} catch (Throwable t) {
                t.printStackTrace();
			}
           throw new ServletException(ex);
		}
       
	}


}
#2

Tu tá tentando fechar uma sessao nula

conexaoHibernateFilter.java:32

this.sf.getCurrentSession().close();

feche a sessão em caso de erro!!


          HibernateUtil.currentSession().getTransaction().commit();
	//TRANSACAO COMMITADA
		}catch(Exception e){
			if(HibernateUtil.currentSession().getTransaction().isActive()){  
				//RollBack Transaction  
			    HibernateUtil.currentSession().getTransaction().rollback();  
			}  
			throw new ServletException(e);
		} finally {
			HibernateUtil.closeCurrentSession();
		//	 SESSAO FECHADA		

}
#3