JSF 1.2 Action 和 ActionListener 中的异常之间的区别
我注意到 JSF 1.2。当actionListener方法中抛出异常时不返回错误页面，但当action方法中抛出异常时返回错误页面。这是为什么？在这两种情况下它都能返回错误页面吗？
I've noticed that JSF 1.2. does not return error page when an exception was thrown in actionListener method but does return error page when an exception was thrown in action method. Why is that? Can it return error page in both cases?
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FacesEvent侦听器方法被静默捕获并包装在AbortProcessingException并记录到控制台。这正是按照规范。ActionEvent侦听器方法（与任何其他FacesEvent侦听器方法一样）不负责导航任务。真正的行动方法有。一般来说，只有当您想要观察操作调用时才应使用操作侦听器方法，而不是执行某些业务任务（这会影响响应）。Any exception which is thrown in a
FacesEventlistener method is silently caught and wrapped in aAbortProcessingExceptionand logged to the console. That's just as per the specification.The
ActionEventlistener method (as any otherFacesEventlistener method) has no responsibility for navigational tasks. The real action method has. Generally, the action listener method should only be used whenever you want to observe an action invoke, not to execute some business task (which affects the response).