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我正在開發一個使用PrimeFaces dataTable顯示用戶列表的jsf頁面。用戶存儲在類Model.User的對象中。java.lang.IllegalArgumentException：無法將Model.User [usrId = 1]類型Model.User轉換爲類Model.User
<p:dataTable id="usersDataTable" value="#{userController.users}" var="u">
<!-- Other columns -->
<p:column>
<p:commandLink oncomplete="dlg.show()" value="Show Dialog">
<f:setPropertyActionListener value="#{u}" target="#{userController.currentUser}" />
</p:commandLink>
</p:column>
</p:dataTable>
該對話框將顯示一條確認消息，但這並不重要。問題的關鍵是，當我點擊了commandLink的currentUser未設置並在GlassFish中日誌，我可以看到這個錯誤有以下堆棧跟蹤：
WARNING: java.lang.IllegalArgumentException: Cannot convert Model.User[ usrId=1 ]
type class Model.User to class Model.User
javax.el.ELException: java.lang.IllegalArgumentException: Cannot convert Model.User[usrId=1 ] of type class Model.User to class Model.User
at com.sun.el.ExpressionFactoryImpl.coerceToType(ExpressionFactoryImpl.java:73)
at com.sun.faces.facelets.tag.jsf.core.SetPropertyActionListenerHandler$SetPropertyListener.processAction(SetPropertyActionListenerHandler.java:210)
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:769)
at javax.faces.component.UICommand.broadcast(UICommand.java:300)
at javax.faces.component.UIData.broadcast(UIData.java:1093)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
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:722)
Caused by: java.lang.IllegalArgumentException: Cannot convert Model.User[ usrId=1 ] of type class Model.User to class Model.User
at com.sun.el.lang.ELSupport.coerceToType(ELSupport.java:412)
at com.sun.el.ExpressionFactoryImpl.coerceToType(ExpressionFactoryImpl.java:71)
... 35 more
奇怪的是，它不能轉換Model.User到Model.User，它讓我目瞪口呆。