JSF Ajax请求中的异常处理

Question

处理JSF ajax请求时引发异常时，如何处理异常并访问堆栈跟踪？现在，当JSF项目阶段设置为Development时，我仅在JavaScript警报中获得异常类名称和消息。更糟糕的是，当JSF项目阶段设置为Production时，没有任何视觉反馈，并且服务器日志不显示有关异常的任何信息。

如果相关，那么我在Netbeans中使用GlassFish。

Answer 1

OmniFaces FullAjaxExceptionHandler展示柜中充实了这个问题。基本上，您需要创建一个定制，ExceptionHandler因为标准JSF不会提供一个定制的定制（至少不是明智的选择）。在其中，您将可以接触Exception引起所有麻烦的实例。这是一个启动示例：public class YourExceptionHandler extends ExceptionHandlerWrapper {&nbsp; &nbsp; private ExceptionHandler wrapped;&nbsp; &nbsp; public YourExceptionHandler(ExceptionHandler wrapped) {&nbsp; &nbsp; &nbsp; &nbsp; this.wrapped = wrapped;&nbsp; &nbsp; }&nbsp; &nbsp; @Override&nbsp; &nbsp; public void handle() throws FacesException {&nbsp; &nbsp; &nbsp; &nbsp; FacesContext facesContext = FacesContext.getCurrentInstance();&nbsp; &nbsp; &nbsp; &nbsp; for (Iterator<ExceptionQueuedEvent> iter = getUnhandledExceptionQueuedEvents().iterator(); iter.hasNext();) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Throwable exception = iter.next().getContext().getException(); // There it is!&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Now do your thing with it. This example implementation merely prints the stack trace.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; exception.printStackTrace();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // You could redirect to an error page (bad practice).&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Or you could render a full error page (as OmniFaces does).&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Or you could show a FATAL faces message.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // Or you could trigger an oncomplete script.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // etc..&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; getWrapped().handle();&nbsp; &nbsp; }&nbsp; &nbsp; @Override&nbsp; &nbsp; public ExceptionHandler getWrapped() {&nbsp; &nbsp; &nbsp; &nbsp; return wrapped;&nbsp; &nbsp; }}为了使其运行，请ExceptionHandlerFactory如下创建一个自定义：public class YourExceptionHandlerFactory extends ExceptionHandlerFactory {&nbsp; &nbsp; private ExceptionHandlerFactory parent;&nbsp; &nbsp; public YourExceptionHandlerFactory(ExceptionHandlerFactory parent) {&nbsp; &nbsp; &nbsp; &nbsp; this.parent = parent;&nbsp; &nbsp; }&nbsp; &nbsp; @Override&nbsp; &nbsp; public ExceptionHandler getExceptionHandler() {&nbsp; &nbsp; &nbsp; &nbsp; return new YourExceptionHandler(parent.getExceptionHandler());&nbsp; &nbsp; }}需要进行以下注册faces-config.xml：<factory>&nbsp; &nbsp; <exception-handler-factory>com.example.YourExceptionHandlerFactory</exception-handler-factory></factory>