WebSphere Application Server 8 で Apache MyFaces 2 を使用しています。ViewExpiredException を処理するカスタム ExceptionHandler を実装したいと考えています。
BalusC が投稿したコードを使用します。Factory は適切なタイミングで呼び出されますが、ここで handleNavigation が呼び出されると NullPointerException が発生します。
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<ExceptionQueuedEvent> 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&expired=true");
facesContext.renderResponse();
iter.remove();
}
}
getWrapped().handle();
}
@Override
public ExceptionHandler getWrapped() {
return wrapped;
}
}
例外は次のとおりです。
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)
]
編集: まず、/content は WebContent のディレクトリです。これはコンテキスト パスではありません。コードを変更し、次のように外部リダイレクトを使用しました。
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();
}
}
ただし、facesContext.getExternalContext().redirect で同じ NullPointerException を取得します。しかし、ExternalContext は null ではありません。RequestServletPath を取得しました。
ここで私のコードに何が問題なのですか？
よろしくお願いします - 投票