我对嵌套的数据表和事件rowDblselect有问题。如果我在嵌套表中使用相同类型的事件，然后双击嵌套数据表或父数据表中的行，则会导致异常com.sun.faces.context.AjaxExceptionHandlerImpl handlePartialResponseError java.lang.ArrayIndexOutOfBoundsException：0。
这段代码演示了问题或bug。
<p:dataTable id="dataTable1" value="list1">
<p:ajax event="rowDblselect"
listener="listener1"/>
<p:column>
test1
<p:rowToggler />
</p:column>
<p:rowExpansion>
<p:dataTable id="dataTable2" value="list2">
<p:ajax event="rowDblselect"
listener="listener2"/>
<p:column>
test2
</p:column>
</p:dataTable>
</p:rowExpansion>
有人能帮我解决这个问题吗？非常感谢。JSF 2.2.3 Mojarra、Primefaces 4.0、Extensions 1.0Tomcat 7.0.41
堆栈跟踪：这是在双击父表之后发生的。
XI 19, 2013 12:29:00 ODP. com.sun.faces.context.PartialViewContextImpl processPartial
INFO: java.lang.NullPointerException
java.lang.NullPointerException
at javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:2458)
at javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:2327)
at com.sun.faces.el.CompositeComponentAttributesELResolver$ExpressionEvalMap.put(CompositeComponentAttributesELResolver.java:415)
at com.sun.faces.el.CompositeComponentAttributesELResolver$ExpressionEvalMap.put(CompositeComponentAttributesELResolver.java:331)
at javax.el.MapELResolver.setValue(MapELResolver.java:94)
at com.sun.faces.el.DemuxCompositeELResolver._setValue(DemuxCompositeELResolver.java:255)
at com.sun.faces.el.DemuxCompositeELResolver.setValue(DemuxCompositeELResolver.java:281)
at org.apache.el.parser.AstValue.setValue(AstValue.java:218)
at org.apache.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:253)
at com.sun.faces.facelets.el.ContextualCompositeValueExpression.setValue(ContextualCompositeValueExpression.java:172)
at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:131)
at org.primefaces.component.datatable.DataTable.processUpdates(DataTable.java:561)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at org.primefaces.component.api.UIData.process(UIData.java:328)
at org.primefaces.component.api.UIData.processChildren(UIData.java:309)
at org.primefaces.component.api.UIData.processPhase(UIData.java:267)
at org.primefaces.component.api.UIData.processUpdates(UIData.java:257)
at org.primefaces.component.datatable.DataTable.processUpdates(DataTable.java:556)
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:554)
at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
at org.primefaces.component.api.UIData.visitTree(UIData.java:675)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1740)
at javax.faces.component.UIForm.visitTree(UIForm.java:371)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1740)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1740)
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:399)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:263)
at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:57)
at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:1252)
at com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:78)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:197)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
XI 19, 2013 12:29:00 ODP. com.sun.faces.lifecycle.UpdateModelValuesPhase execute
WARNING: java.lang.NullPointerException
XI 19, 2013 12:29:00 ODP. com.sun.faces.lifecycle.InvokeApplicationPhase execute
WARNING: 0
java.lang.ArrayIndexOutOfBoundsException: 0
at org.apache.el.parser.AstValue.convertArgs(AstValue.java:320)
at org.apache.el.parser.AstValue.invoke(AstValue.java:274)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
at com.sun.faces.facelets.el.ContextualCompositeMethodExpression.invoke(ContextualCompositeMethodExpression.java:188)
at com.sun.faces.facelets.tag.TagAttributeImpl$AttributeLookupMethodExpression.invoke(TagAttributeImpl.java:477)
at org.primefaces.component.behavior.ajax.AjaxBehaviorListenerImpl.processAjaxBehavior(AjaxBehaviorListenerImpl.java:53)
at javax.faces.event.AjaxBehaviorEvent.processListener(AjaxBehaviorEvent.java:113)
at javax.faces.component.behavior.BehaviorBase.broadcast(BehaviorBase.java:106)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:804)
at javax.faces.component.UIData.broadcast(UIData.java:1086)
at javax.faces.component.UIData.broadcast(UIData.java:1108)
at javax.faces.component.UIData.broadcast(UIData.java:1108)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
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:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:197)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
XI 19, 2013 12:29:00 ODP. com.sun.faces.context.AjaxExceptionHandlerImpl handlePartialResponseError
SEVERE: java.lang.ArrayIndexOutOfBoundsException: 0
at org.apache.el.parser.AstValue.convertArgs(AstValue.java:320)
at org.apache.el.parser.AstValue.invoke(AstValue.java:274)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
at com.sun.faces.facelets.el.ContextualCompositeMethodExpression.invoke(ContextualCompositeMethodExpression.java:188)
at com.sun.faces.facelets.tag.TagAttributeImpl$AttributeLookupMethodExpression.invoke(TagAttributeImpl.java:477)
at org.primefaces.component.behavior.ajax.AjaxBehaviorListenerImpl.processAjaxBehavior(AjaxBehaviorListenerImpl.java:53)
at javax.faces.event.AjaxBehaviorEvent.processListener(AjaxBehaviorEvent.java:113)
at javax.faces.component.behavior.BehaviorBase.broadcast(BehaviorBase.java:106)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:804)
at javax.faces.component.UIData.broadcast(UIData.java:1086)
at javax.faces.component.UIData.broadcast(UIData.java:1108)
at javax.faces.component.UIData.broadcast(UIData.java:1108)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
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:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:197)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
XI 19, 2013 12:29:00 ODP. com.sun.faces.context.PartialViewContextImpl processPartial
INFO: java.lang.NullPointerException
java.lang.NullPointerException
at javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:2458)
at javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:2327)
at com.sun.faces.el.CompositeComponentAttributesELResolver$ExpressionEvalMap.put(CompositeComponentAttributesELResolver.java:415)
at com.sun.faces.el.CompositeComponentAttributesELResolver$ExpressionEvalMap.put(CompositeComponentAttributesELResolver.java:331)
at javax.el.MapELResolver.setValue(MapELResolver.java:94)
at com.sun.faces.el.DemuxCompositeELResolver._setValue(DemuxCompositeELResolver.java:255)
at com.sun.faces.el.DemuxCompositeELResolver.setValue(DemuxCompositeELResolver.java:281)
at org.apache.el.parser.AstValue.setValue(AstValue.java:218)
at org.apache.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:253)
at com.sun.faces.facelets.el.ContextualCompositeValueExpression.setValue(ContextualCompositeValueExpression.java:172)
at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:131)
at org.primefaces.component.datatable.DataTable.processUpdates(DataTable.java:561)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1286)
at org.primefaces.component.api.UIData.process(UIData.java:328)
at org.primefaces.component.api.UIData.processChildren(UIData.java:309)
at org.primefaces.component.api.UIData.processPhase(UIData.java:267)
at org.primefaces.component.api.UIData.processUpdates(UIData.java:257)
at org.primefaces.component.datatable.DataTable.processUpdates(DataTable.java:556)
at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:554)
at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
at org.primefaces.component.api.UIData.visitTree(UIData.java:675)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1740)
at javax.faces.component.UIForm.visitTree(UIForm.java:371)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1740)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1740)
at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:399)
at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:263)
at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:57)
at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:1252)
at com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:78)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:197)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
堆栈跟踪告诉您需要<p:dataTable>中的（有效）selection属性。
以下是相关部分：
java.lang.NullPointerException
at javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:2458)
at javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:2327)
at com.sun.faces.el.CompositeComponentAttributesELResolver$ExpressionEvalMap.put(CompositeComponentAttributesELResolver.java:415)
at com.sun.faces.el.CompositeComponentAttributesELResolver$ExpressionEvalMap.put(CompositeComponentAttributesELResolver.java:331)
at javax.el.MapELResolver.setValue(MapELResolver.java:94)
at com.sun.faces.el.DemuxCompositeELResolver._setValue(DemuxCompositeELResolver.java:255)
at com.sun.faces.el.DemuxCompositeELResolver.setValue(DemuxCompositeELResolver.java:281)
at org.apache.el.parser.AstValue.setValue(AstValue.java:218)
at org.apache.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:253)
at com.sun.faces.facelets.el.ContextualCompositeValueExpression.setValue(ContextualCompositeValueExpression.java:172)
at com.sun.faces.facelets.el.TagValueExpression.setValue(TagValueExpression.java:131)
at org.primefaces.component.datatable.DataTable.processUpdates(DataTable.java:561)
UIComponentBase类的第2458行（所示轨迹的第一行）为：
if (value == null) {
throw new NullPointerException();
}
因此，ValueExpression的值为null。
DataTable类的第561行（所示轨迹的最后一行）是：
selectionVE.setValue(context.getELContext(), this.getLocalSelection());
因此，this.getLocalSelection()返回null。
getLocalSelection()方法看起来是这样的：
public Object getLocalSelection() {
return getStateHelper().get(PropertyKeys.selection);
}
因此，<p:dataTable selection>属性返回null（或未定义）。
解决方案应该很简单：确保它不是null（或已定义）。
<p:dataTable ... selection="#{bean.selection}">