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我正在爲Web應用程序使用帶有Richfaces 4.0.0.Final的JSF2.0。我有一個即時通訊使用導航。當我點擊樹中的一個節點時，我的selectionListener應該導航到與該節點相關的頁面。但是當我點擊一個節點時，我得到一個NullPointerException：<rich:tree> Node上的NullPointerException異常點擊
SEVERE: java.lang.NullPointerException
javax.faces.FacesException: java.lang.NullPointerException
at org.richfaces.component.UIDataAdaptor.invokeOnComponent(UIDataAdaptor.java:1124)
at org.richfaces.renderkit.TreeRendererBase.decode(TreeRendererBase.java:208)
at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:787)
at org.richfaces.component.UIDataAdaptor.processDecodes(UIDataAdaptor.java:824)
at org.richfaces.context.PartialViewExecuteVisitCallback.visit(PartialViewExecuteVisitCallback .java:55)
at org.richfaces.context.BaseExtendedVisitContext.invokeVisitCallback(BaseExtendedVisitContext.java:337)
at org.richfaces.component.UIDataAdaptor.visitTree(UIDataAdaptor.java:1235)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)
at javax.faces.component.UIForm.visitTree(UIForm.java:344)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)
at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)
at org.richfaces.context.ExtendedPartialViewContextImpl.executeComponents(ExtendedPartialViewContextImpl.java:249)
at org.richfaces.context.ExtendedPartialViewContextImpl.processPartialExecutePhase(ExtendedPartialViewContextImpl.java:229)
at org.richfaces.context.ExtendedPartialViewContextImpl.processPartial(ExtendedPartialViewContextImpl.java:208)
at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:931)
at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78)
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:409)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)
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 com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
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:326)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)
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:662)
Caused by: java.lang.NullPointerException
at org.richfaces.model.ClassicTreeNodeDataModelImpl.setupChildContext(ClassicTreeNodeDataModelImpl.java:49)
at org.richfaces.model.ClassicTreeNodeDataModelImpl.setupChildContext(ClassicTreeNodeDataModelImpl.java:35)
at org.richfaces.model.NodesTreeSequenceKeyModel.setupKey(NodesTreeSequenceKeyModel.java:47)
at org.richfaces.model.TreeSequenceKeyModel.setRowKey(TreeSequenceKeyModel.java:49)
at org.richfaces.component.UIDataAdaptor.setRowKey(UIDataAdaptor.java:277)
at org.richfaces.component.UIDataAdaptor.invokeOnComponent(UIDataAdaptor.java:1111)
... 43 more
我不知道是什麼原因導致了這個錯誤。
這裏是我的代碼：
XHTML：
<h:form id="richSideBarForm" >
<rich:tree id="richTreeBar" value="#{richTree.rootNode}" var="node" toggleType="client" selectionType="ajax" nodeType="#{node.type}"
iconExpanded="/resources/images/FolderOpen_web.png" iconCollapsed="/resources/images/FolderClosed_web.png"
iconLeaf="/resources/images/Worksheet_web_mini.png" selectionChangeListener="#{richTree.processTreeSelectionChange}">
<rich:treeNode id="rootNode" type="folder" iconExpanded="/resources/images/FolderOpen_web.png" iconCollapsed="/resources/images/FolderClosed_web.png">
<h:outputText id="rootNodeOutput" value="#{node}" />
</rich:treeNode>
<rich:treeNode id="leafNode" type="leaf" iconLeaf="/resources/images/Worksheet_web_mini.png" >
<h:outputText id="leafNodeOutput" value="#{node}" />
</rich:treeNode>
<rich:treeNode id="leafNode" type="location" iconExpanded="/resources/images/HOME_webHI.png" iconCollapsed="/resources/images/HOME_webHI.png" >
<h:outputText id="leafNodeOutput" value="#{node}" />
</rich:treeNode>
</rich:tree>
</h:form>
我不知道這是否是重要的，但在導航樹是正在使用標籤
包含在我的模板一個XHTML文件的一部分BackingBean：
public class RichTree implements Serializable, TreeSelectionChangeListener{
private TreeNode rootNode;
private UITree treeBinding;
public RichTree() {
rootNode = new TreeNodeImpl();
loadTree();
}
/**
* @return the rootNode
*/
public TreeNode getRootNode() {
return rootNode;
}
public void setRootNode(TreeNode rootNode) {
this.rootNode = rootNode;
}
private void loadTree() {
AGOTreeNode summaryNode = new AGOTreeNode();
summaryNode.setLabel("0000000001");
getRootNode().addChild(0, summaryNode);
AGOTreeNode childNode = new AGOTreeNode();
childNode.setLabel("Node1");
childNode.setNavigation("page1");
summaryNode.addChild(0, childNode);
childNode = new AGOTreeNode();
childNode.setLabel("Node2");
childNode.setNavigation("page2";
summaryNode.addChild(1, childNode);
}
@Override
public void processTreeSelectionChange(TreeSelectionChangeEvent tsce) throws AbortProcessingException {
List<Object> selection = new ArrayList<Object>(tsce.getNewSelection());
Object currentSelectionKey = selection.get(0);
UITree tree = (UITree) tsce.getSource();
tree.setRowKey(currentSelectionKey);
AGOTreeNode node = (AGOTreeNode) tree.getRowData();
String nav= node.getNavigation();
FacesContext fc = FacesContext.getCurrentInstance();
fc.getApplication().getNavigationHandler().handleNavigation(fc, "", nav);
}
AGOTreeNode延伸TreeNodeImpl和一個dds幾個實例，並覆蓋了toString方法。
任何幫助，非常感謝！
-Doug Costa