Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package br.com.gerenciapessoal.util.jsf; import br.com.gerenciapessoal.util.service.NegocioException; import java.io.IOException; import java.util.Iterator; import javax.faces.FacesException; import javax.faces.application.ViewExpiredException; import javax.faces.context.ExceptionHandler; import javax.faces.context.ExceptionHandlerWrapper; import javax.faces.context.ExternalContext; import javax.faces.context.FacesContext; import javax.faces.event.ExceptionQueuedEvent; import javax.faces.event.ExceptionQueuedEventContext; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * * @author jalima */ public class JsfExceptionHandler extends ExceptionHandlerWrapper { private static final Log log = LogFactory.getLog(JsfExceptionHandler.class); private final ExceptionHandler wrapped; public JsfExceptionHandler(ExceptionHandler wrapped) { this.wrapped = wrapped; } @Override public ExceptionHandler getWrapped() { return this.wrapped; } @Override public void handle() throws FacesException { Iterator<ExceptionQueuedEvent> events = getUnhandledExceptionQueuedEvents().iterator(); while (events.hasNext()) { ExceptionQueuedEvent event = events.next(); ExceptionQueuedEventContext context = (ExceptionQueuedEventContext) event.getSource(); Throwable exception = context.getException(); @SuppressWarnings("ThrowableResultIgnored") NegocioException negocioException = getNegocioException(exception); boolean handled = false; try { if (exception instanceof ViewExpiredException) { handled = true; redirect("/"); } else if (negocioException != null) { handled = true; FacesUtil.addErrorMessage(negocioException.getMessage()); } else { handled = true; log.error("Erro de sistemea: " + exception.getMessage(), exception); redirect("/Erro.xhtml"); } } finally { if (handled) { events.remove(); } } } getWrapped().handle(); } @SuppressWarnings("ThrowableResultIgnored") private NegocioException getNegocioException(Throwable exception) { if (exception instanceof NegocioException) { return (NegocioException) exception; } else if (exception.getCause() != null) { return getNegocioException(exception.getCause()); } return null; } private void redirect(String page) { try { FacesContext facesContext = FacesContext.getCurrentInstance(); ExternalContext externalContext = facesContext.getExternalContext(); String contextPath = externalContext.getRequestContextPath(); externalContext.redirect(contextPath + page); facesContext.responseComplete(); } catch (IOException e) { throw new FacesException(e); } } }