[resolvido] Erro filter [ eu acho ]

<blockquote>javax.servlet.ServletException: erro

at javax.faces.webapp.FacesServlet.service(FacesServlet.java:256)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at br.com.ternet.cartao.filter.CartaoFilter.doFilter(CartaoFilter.java:36)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)</blockquote>

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		try { 
			HttpSession session = ((HttpServletRequest) request).getSession();
			UsuarioBean usuario = (UsuarioBean) session.getAttribute("usuario");
			LoginBiz biz = new LoginBiz();
			System.out.println("Passando pelo CartaoFilter");
			if ( biz.isUsuarioValidoInSession(usuario) ) {
				chain.doFilter(request, response);
			} else {
				((HttpServletResponse) response).sendRedirect("/cartao/faces/login.jsf");  
			}
		} catch (Exception e) { 
			e.printStackTrace();
		}
	}