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我有一个error-page指令将所有异常重定向到错误显示页面

我的web.xml

<web-app [...]>
    [...]
    <error-page>
        <exception-type>java.lang.Exception</exception-type>
        <location>/view/error.xhtml</location>
    </error-page>
</web-app>

它几乎适用于任何异常,但今天我注意到有时会记录 JSF 错误并且不处理异常(即,没有重定向到错误页面)。

这是我在日志中的内容:

javax.enterprise.resource.webcontainer.jsf.context || JSF1073: javax.faces.event.AbortProcessingException caught during processing of INVOKE_APPLICATION 5 : UIComponent-ClientId=searchForm:j_idt147, Message=/view/listView.xhtml @217,7 actionListener="#{listController.nextPageClicked}": java.lang.NullPointerException
javax.enterprise.resource.webcontainer.jsf.context || /view/listView.xhtml @217,7 actionListener="#{listController.nextPageClicked}": java.lang.NullPointerException
javax.faces.event.AbortProcessingException: /view/listView.xhtml @217,7 actionListener="#{listController.nextPageClicked}": java.lang.NullPointerException
    at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:182)
    at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
    at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:769)
    at javax.faces.component.UICommand.broadcast(UICommand.java:300)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1539)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.doChainInvoke(StandardPipeline.java:600)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:96)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:330)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:174)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:828)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:725)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1019)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.NullPointerException
    at ch.ethz.id.wai.web.controller.ListController.nextPageClicked(ListController.java:410)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)

我该如何处理这些异常?

编辑:通过句柄我并不是说我想纠正导致异常的问题(这是另一个主题),但我的问题是如何使用<error-page>指令在 JSF 中捕获异常。错误页面可见,日志中的条目很容易被遗漏。

4

1 回答 1

7

这是设计使然。当一个actionListener方法抛出异常时,它只会被记录,不会被抛出。它“只是”一个旨在进行琐碎的预处理/记录任务等的侦听器,而不是真正的动作。只有当一个action方法抛出异常时,才会一直委托给容器,最终进入默认的错误页面。

如果要执行对异常敏感的业务操作,请改为在action方法中执行。

也可以看看:

于 2012-04-12T01:45:01.757 回答