当页面中的 view 过期时，我出现以下错误。消息说Error page '/home.xhtml' will be shown.但实际上没有显示任何内容，页面保持不变，而且它只是被冻结了。我正在使用来自 Omnifaces 的 FullAjaxExceptionHandler ，由balusC描述。
我使用的是Primefaces 3.5和Mojarra 2.1.17。
Mär 11, 2013 1:40:30 PM org.apache.catalina.core.ApplicationContext log
SEVERE: FullAjaxExceptionHandlerx: An exception occurred during processing JSF ajax request. Error page '/home.xhtml' will be shown.
javax.faces.application.ViewExpiredException: viewId:/wishes_book.xhtml - View /wishes_book.xhtml could not be restored.
at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:205)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1812)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Mär 11, 2013 1:40:30 PM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
SEVERE: Error Rendering View[/home.xhtml]
java.lang.NullPointerException
at org.primefaces.renderkit.CoreRenderer.getWidgetBuilder(CoreRenderer.java:481)
at org.primefaces.component.menubar.MenubarRenderer.encodeScript(MenubarRenderer.java:36)
at org.primefaces.component.menu.BaseMenuRenderer.encodeEnd(BaseMenuRenderer.java:40)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeRow(PanelGridRenderer.java:143)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeStaticBody(PanelGridRenderer.java:107)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeBody(PanelGridRenderer.java:63)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeEnd(PanelGridRenderer.java:49)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeRow(PanelGridRenderer.java:143)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeStaticBody(PanelGridRenderer.java:107)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeBody(PanelGridRenderer.java:63)
at org.primefaces.component.panelgrid.PanelGridRenderer.encodeEnd(PanelGridRenderer.java:49)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
at com.sun.faces.context.PartialViewContextImpl.renderAll(PartialViewContextImpl.java:404)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:289)
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:183)
at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:183)
at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:982)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:411)
at com.meinanliegen.handlers.exceptions.FullAjaxExceptionHandler.renderErrorPageView(FullAjaxExceptionHandler.java:231)
at com.meinanliegen.handlers.exceptions.FullAjaxExceptionHandler.handleAjaxException(FullAjaxExceptionHandler.java:200)
at com.meinanliegen.handlers.exceptions.FullAjaxExceptionHandler.handle(FullAjaxExceptionHandler.java:145)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119)
at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:116)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1812)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Mär 11, 2013 1:40:30 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/MeinAnliegen] threw exception
你能帮我一个建议我怎样才能解决他的问题？
答案 0 :(得分：2)
这是由PrimeFaces 3.5引起的。他们添加了PhaseListener，在渲染响应阶段创建并放置WidgetBuilder作为上下文属性。然而，FullAjaxExceptionHandler在不处于渲染响应阶段时强制直接在当前阶段进行渲染。这导致WidgetBuilder在编码PrimeFaces组件期间null，因此导致此NPE。此外，当当前阶段是渲染响应时，它仍然不起作用，因为FullAjaxExceptionHandler在渲染之前有点过于激烈地清除整个上下文属性映射（唯一的原因是强制重新注入JSF资源依赖关系，如CSS / JS文件），包括PrimeFaces WidgetBuilder。
报告为OmniFaces issue 120。 FullAjaxExceptionHandler已得到改进，可在当前未处于渲染响应阶段时将渲染委托给JSF，并仅从上下文属性映射中删除特定属性。您需要将OmniFaces更新至至少1.4（当前为1.4.1）才能使其正常工作。