自定义 JSF ExceptionHandler 不起作用

问题描述

我有一个带有 PrimeFaces 的 JSF 应用程序。我的应用在 WildFly 上运行

如果会话过期，我必须将用户重定向到登录页面。我写了一个 CustomExceptionHandler：

ExceptionHandlerFactory：

public class ExceptionHandlerFactory extends javax.faces.context.ExceptionHandlerFactory {

private javax.faces.context.ExceptionHandlerFactory parent;

public ExceptionHandlerFactory(javax.faces.context.ExceptionHandlerFactory parent) {
    this.parent = parent;
}

@Override
public ExceptionHandler getExceptionHandler() {
    ExceptionHandler result = parent.getExceptionHandler();
    result = new CustomExceptionHandler(result);
    return result;
}

}

ExceptionHandlerWrapper：

class CustomExceptionHandler extends ExceptionHandlerWrapper {

private ExceptionHandler parent;

public CustomExceptionHandler(ExceptionHandler parent) {
    this.parent = parent;
}

@Override
public ExceptionHandler getWrapped() {
    return this.parent;
}

@Override
public void handle() throws FacesException {
    for (Iterator<ExceptionQueuedEvent> i = getUnhandledExceptionQueuedEvents().iterator(); i.hasNext();) {
        ExceptionQueuedEvent event = i.next();
        System.out.println("Iterating over ExceptionQueuedEvents. Current:" + event.toString());
        ExceptionQueuedEventContext context = (ExceptionQueuedEventContext) event.getSource();
        Throwable t = context.getException();
        if (t instanceof ViewExpiredException) {
            ViewExpiredException vee = (ViewExpiredException) t;
            FacesContext fc = FacesContext.getCurrentInstance();

            NavigationHandler nav =
                    fc.getApplication().getNavigationHandler();
            try {
                // Push some useful stuff to the flash scope for
                // use in the page
                fc.getExternalContext().getFlash().put("expiredViewId",vee.getViewId());

                nav.handleNavigation(fc,null,"/index.xhtml");
                fc.renderResponse();

            } finally {
                i.remove();
            }
        }
    }
    // At this point,the queue will not contain any ViewExpiredEvents.
    // Therefore,let the parent handle them.
    getWrapped().handle();
}
}

faces-config.xml：

...
<factory>
    <exception-handler-factory>
        hu.****.**.fe.exception.ExceptionHandlerFactory
    </exception-handler-factory>
</factory>
...

会话过期后，不是登录页面，只有这个页面：

<partial-response>
<changes>
<update id="javax.faces.ViewRoot">
<html***the content of the index.xhtml (login page)</html>
</update>
<update id="j_id1:javax.faces.ViewState:0">-2214895618242088710:6470920362668814776</update>
</changes>
</partial-response>

请帮忙，代码有什么问题。

解决方法

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