java.lang.IllegalArgumentException:空源 [英] java.lang.IllegalArgumentException: null source

问题描述

我们有一个使用JSF2和Spring的应用程序.部署后，该应用程序可以正常运行.但是，如果执行以下步骤，就会发生这种情况:

We have an application which uses JSF2 and Spring. The application works fine when deployed. But this happens if I went through the following steps:

1. 打开应用程序的登录页面.
2. 在服务器上重新部署应用程序.

3. 试图使用先前打开的登录页面登录，并且显示以下异常:

1. Open the login page of the application.
2. Redeployed the application on the server.

3. Tried to login using the previously opened login page, and it shows the following exception:

javax.servlet.ServletException: null source
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:321)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)

root cause

java.lang.IllegalArgumentException: null source
    at java.util.EventObject.<init>(EventObject.java:38)
    at javax.faces.event.SystemEvent.<init>(SystemEvent.java:67)
    at javax.faces.event.ComponentSystemEvent.<init>(ComponentSystemEvent.java:69)
    at javax.faces.event.PostRestoreStateEvent.<init>(PostRestoreStateEvent.java:69)
    at com.sun.faces.lifecycle.RestoreViewPhase.deliverPostRestoreStateEvent(RestoreViewPhase.java:256)
    at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:245)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:107)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)

如果我单击第一个登录页面，然后输入登录详细信息，则应用程序不会中断.仅当我尝试将先前加载的登录页面与新部署的应用程序一起使用时，才会发生这种情况.

If I click on the first login page and then enter the login details the application does not break. This only occurs if I try to use the previously loaded login page with the newly deployed application.

有人知道答案吗?

推荐答案

这个应该已经作为ViewExpiredException抛出了.这是一个错误，该错误开始在Mojarra 2.0.3中显现，并已在Mojarra 2.1.0中修复.另请参见问题1762 (请注意，Mojarra 2.1.0

This one should have been thrown as a ViewExpiredException. It's a bug which started to manifest in Mojarra 2.0.3 and is been fixed in Mojarra 2.1.0. See also issue 1762 (note that Mojarra 2.1.0 doesn't work on Tomcat/Jetty, use at least Mojarra 2.1.1 then).

基本上，当Mojarra无法构建或还原视图时，通常会抛出足够具体的异常，但是由于此错误，以后在代码中错误地期望出现有效视图，从而导致生成IllegalArgumentException: null source. real 的可能原因是该视图包含一个简单的XML语法错误，例如缺少标签或属性值损坏，为此Mojarra通常会抛出带有非常详细消息的FaceletException带有行号和位置等.

Basically, when Mojarra fails to build or restore the view, then it usually throws a specific enough exception, but due to this bug, a valid view was incorrectly been expected later in the code which in turn results in IllegalArgumentException: null source. The possible real cause would have been that the view contains a simple XML syntax error, such as a missing tag or broken attribute value, for which Mojarra would usually have thrown a FaceletException with a very detailed message with line number and position and such.

为防止出现ViewExpiredException，您必须在执行任何操作之前通过GET请求刷新页面.如果您使用的Mojarra版本没有发现此错误(例如2.0.2或更旧版本，或者2.1.0或更高版本)，则可以在特定异常下使用web.xml中的<error-page>优雅地处理它，并且提供一个自定义错误页面，其中通知最终用户会话已过期，以及指向初始请求URI的链接.

To prevent the ViewExpiredException, you would have to refresh the page by a GET request before doing any actions on it. If you're using a Mojarra version where this bug does not manifest (e.g. 2.0.2 or older, or 2.1.0 or newer), then you could gracefully handle it with an <error-page> in web.xml on the particular exception and provide a custom error page wherein the enduser is informed that the session has been expired, along with a link to the initial request URI.

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