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POJSF ViewExpiredExceptionHandler NullPointerException
 

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    <p>I use Apache MyFaces 2 on WebSphere Application Server 8. I want to implement a custom ExceptionHandler that handles ViewExpiredException.</p> <p>I use the code which <a href="https://stackoverflow.com/questions/8144195/check-if-session-exists-jsf/8144420#8144420">BalusC posted</a> . The Factory is called at the right time but I get a NullPointerException when handleNavigation is called here:</p> <pre><code>public class ViewExpiredExceptionHandler extends ExceptionHandlerWrapper { private ExceptionHandler wrapped; public ViewExpiredExceptionHandler(ExceptionHandler wrapped) { this.wrapped = wrapped; } @Override public void handle() throws FacesException { FacesContext facesContext = FacesContext.getCurrentInstance(); for (Iterator&lt;ExceptionQueuedEvent&gt; iter = getUnhandledExceptionQueuedEvents() .iterator(); iter.hasNext();) { Throwable exception = iter.next().getContext().getException(); if (exception instanceof ViewExpiredException) { facesContext .getApplication() .getNavigationHandler() .handleNavigation(facesContext, null, "/content/home?faces-redirect=true&amp;expired=true"); facesContext.renderResponse(); iter.remove(); } } getWrapped().handle(); } @Override public ExceptionHandler getWrapped() { return wrapped; } } </code></pre> <p>The Exception is:</p> <pre><code>com.ibm.ws.webcontainer.servlet.ServletWrapper service SRVE0068E: An exception was thrown by one of the service methods of the servlet [Faces Servlet] in application [My_App]. Exception created : [java.lang.NullPointerException at org.apache.myfaces.application.NavigationHandlerImpl.getNavigationCase(NavigationHandlerImpl.java:203) at org.apache.myfaces.application.NavigationHandlerImpl.handleNavigation(NavigationHandlerImpl.java:77) at myapp.ViewExpiredExceptionHandler.handle(ViewExpiredExceptionHandler.java:33) at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:191) at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189) at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1147) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:722) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:449) at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.invokeTarget(WebAppFilterChain.java:125) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:92) at myapp.auth.RequestFilter.doFilter(RequestFilter.java:35) at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:192) at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:89) at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:919) at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1016) at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87) at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:886) at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1655) at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:195) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276) at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214) at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113) at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165) at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217) at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161) at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138) at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204) at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775) at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1650) ] </code></pre> <p><strong>EDIT:</strong> First of all /content is a directory in my WebContent. It is not the context path. I changed my code and used external redirect like this:</p> <pre><code>if (exception instanceof ViewExpiredException) { String loc = facesContext.getExternalContext() .getRequestServletPath(); try { facesContext.getExternalContext().redirect(loc); //facesContext.getExternalContext().redirect("/content/home.xhtml"); //facesContext.getExternalContext().redirect("/"); } catch (IOException e) { e.printStackTrace(); } } </code></pre> <p>But still get the same NullPointerException on facesContext.getExternalContext().redirect. But the ExternalContext is not null. I got the RequestServletPath.</p> <p>So whats wrong with my code here?</p> <p>Best regards - veote</p>
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