6 Replies Latest reply on Feb 10, 2011 5:56 AM by veerendra

Re: RichFaces Tree example is not working

veerendra Feb 10, 2011 12:21 AM

Hi, I am working on richfaces tree example. I am getting this Exception. Please help me to fix this issue.

This is the code:

<?xml version='1.0' encoding='UTF-8' ?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"

xmlns:h="http://java.sun.com/jsf/html"

xmlns:f="http://java.sun.com/jsf/core"

xmlns:a4j="http://richfaces.org/a4j"

xmlns:rich="http://richfaces.org/rich">

<head>

<title>RichFaces Tree</title>

.col, .col2 {

width:50%;

vertical-align:top;

}

</style>

</head>

<body>

<f:view>

<h:form>

<h:outputText value="Config Tree:" />

<h:panelGrid columns="2" width="100" columnClasses="col1,col2">

<rich:tree style="width:300px" nodeSelectListener="#{simpleTreeBean1.processSelection}"

reRender="selectedNode"

ajaxSubmitSelection="true"

switchType="client"

value="#{simpleTreeBean1.treeNode}"

var="item">

</rich:tree>

<h:outputText escape="false" value="Selected Node: #{simpleTreeBean1.nodeTitle}" id="selectedNode" />

</h:panelGrid>

</h:form>

</f:view>

</body>

</html>

Managed Bean:

package com.cassidian.tree;

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Properties;

import javax.faces.FacesException;

import javax.faces.bean.ManagedBean;

import javax.faces.component.UIComponent;

import javax.faces.context.ExternalContext;

import javax.faces.context.FacesContext;

import org.richfaces.component.UITree;

import org.richfaces.component.html.HtmlTree;

import org.richfaces.event.NodeSelectedEvent;

import org.richfaces.model.TreeNode;

import org.richfaces.model.TreeNodeImpl;

@ManagedBean

public class SimpleTreeBean1 {

private TreeNode rootNode = null;

private List<String> selectedNodeChildren = new ArrayList<String>();

private String nodeTitle = null;

private static final String DATA_PATH = "simple-tree-data.properties";

private void addNodes(String path, TreeNode node, Properties properties) {

boolean end = false;

int counter = 1;

while (!end) {

String key = path != null ? path + '.' + counter : String.valueOf(counter);

String value = properties.getProperty(key);

if (value != null) {

TreeNodeImpl nodeImpl = new TreeNodeImpl();

nodeImpl.setData(value);

node.addChild(new Integer(counter), nodeImpl);

addNodes(key, nodeImpl, properties);

counter++;

} else {

end = true;

}

private void loadTree() {

FacesContext facesContext = FacesContext.getCurrentInstance();

ExternalContext externalContext = facesContext.getExternalContext();

System.out.println("DATA_PATH: "+ DATA_PATH);

InputStream dataStream = externalContext.getResourceAsStream(DATA_PATH);

try {

Properties properties = new Properties();

properties.load(dataStream);

rootNode = new TreeNodeImpl();

addNodes(null, rootNode, properties);

} catch (IOException e) {

throw new FacesException(e.getMessage(), e);

} finally {

if (dataStream != null) {

try {

dataStream.close();

} catch (IOException e) {

externalContext.log(e.getMessage(), e);

}

public void processSelection(NodeSelectedEvent event) {

HtmlTree tree = (HtmlTree) event.getComponent();

nodeTitle = (String) tree.getRowData();

selectedNodeChildren.clear();

TreeNode currentNode = tree.getModelTreeNode(tree.getRowKey());

if (currentNode.isLeaf()) {

System.out.println("current tree node is a leaf");

selectedNodeChildren.add((String) currentNode.getData());

} else {

System.out.println("current tree node is not a leaf");

Iterator<Map.Entry<Object, TreeNode>> it = currentNode.getChildren();

while (it != null && it.hasNext()) {

Map.Entry<Object, TreeNode> entry = it.next();

selectedNodeChildren.add(entry.getValue().getData().toString());

}

public TreeNode getTreeNode() {

if (rootNode == null) {

loadTree();

}

return rootNode;

}

public String getNodeTitle() {

return nodeTitle;

}

public void setNodeTitle(String nodeTitle) {

this.nodeTitle = nodeTitle;

}

I am getting the Exception:

SEVERE: Error Rendering View[/index.xhtml]

javax.el.ELException: /index.xhtml @29,43 value="#{simpleTreeBean1.treeNode}": java.lang.NullPointerException

at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:76)

at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190)

at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:178)

at javax.faces.component.UIData.getValue(UIData.java:554)

at org.ajax4jsf.component.UIDataAdaptorBase.getValue(UIDataAdaptorBase.java:1647)

at org.richfaces.component.UITree.createDataModel(UITree.java:679)

at org.ajax4jsf.component.UIDataAdaptorBase.getExtendedDataModel(UIDataAdaptorBase.java:621)

at org.ajax4jsf.component.UIDataAdaptorBase.setRowKey(UIDataAdaptorBase.java:339)

at org.richfaces.renderkit.TreeRendererBase.writeContent(TreeRendererBase.java:688)

at org.richfaces.renderkit.TreeRendererBase.encodeChildren(TreeRendererBase.java:629)

at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)

at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:287)

at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185)

at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129)

at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)

at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1613)

at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)

at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:848)

at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1613)

at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1616)

at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:594)

at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)

at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)

at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:127)

at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)

at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)

at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)

at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)

at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)

at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)

at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)

at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)

at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)

at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)

at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)

at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:239)

at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)

at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)

at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)

at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)

at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)

at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)

at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)

at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)

at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)

at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)

at com.sun.grizzly.ContextTask.run(ContextTask.java:69)

at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)

at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)

at java.lang.Thread.run(Thread.java:662)

Caused by: java.lang.NullPointerException

at java.util.Properties$LineReader.readLine(Properties.java:418)

at java.util.Properties.load0(Properties.java:337)

at java.util.Properties.load(Properties.java:325)

at com.cassidian.tree.SimpleTreeBean1.loadTree(SimpleTreeBean1.java:66)

at com.cassidian.tree.SimpleTreeBean1.getTreeNode(SimpleTreeBean1.java:108)

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)

at javax.el.BeanELResolver.getValue(BeanELResolver.java:302)

at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:175)

at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)

at com.sun.el.parser.AstValue.getValue(AstValue.java:116)

at com.sun.el.parser.AstValue.getValue(AstValue.java:163)

at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:219)

at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)

... 58 more

WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception

java.lang.NullPointerException