Question

我在Tomcat 7.0.22中使用JSF 2.1，Spring 3.0.5，Spring Web Flow 2.3.0开始了一个项目。当我在类路径中放置SWF JAR文件（binding，faces，js，js.resources和webflow）时，我无法导航到任何页面而且我得到了这个：

SEVERE: Error Rendering View[/login.xhtml]
java.lang.NullPointerException
    at org.springframework.faces.webflow.FlowViewStateManager.saveView(FlowViewStateManager.java:181)
    at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:225)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:418)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288)
    at org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) ....

当我删除这些JAR文件时，将正确呈现所有页面。这是怎么造成的，我该如何解决？

Answer 1

这是SWF中的一个错误。另见SWF issue 1461。它已在SWF 2.3.1中修复。因此，升级到SWF 2.3.1应该可以解决这个问题。

org.springframework.faces.webflow.FlowViewStateManager.saveView中的java.lang.NullPointerException

1 个答案: