seam & facelets & tree component & strange java.lang.ClassCa

[kot.filemon]

Anyone knows what am I doing wrong?

I have one simple stateful bean which passes root node to tree component. When i try to display the page i'm redirected to seam debug page and get following exception

20:01:59,011 ERROR [STDERR] Mar 19, 2007 8:01:59 PM com.sun.facelets.FaceletViewHandler handleRenderException
SEVERE: Error Rendering View[/tree.xhtml]
java.lang.ClassCastException: richtest.tree.TreeNodeExample
 at org.richfaces.component.AbstractTreeDataModel.setWrappedData(AbstractTreeDataModel.java:63)
 at org.richfaces.component.UITree.createDataModel(UITree.java:477)
 at org.ajax4jsf.ajax.repeat.UIDataAdaptor.getExtendedDataModel(UIDataAdaptor.java:464)
 at org.ajax4jsf.ajax.repeat.UIDataAdaptor.setRowKey(UIDataAdaptor.java:280)
 at org.ajax4jsf.ajax.repeat.UIDataAdaptor.setRowKey(UIDataAdaptor.java:265)
 at org.richfaces.renderkit.TreeRendererBase.writeContent(TreeRendererBase.java:395)
 at org.richfaces.renderkit.TreeRendererBase.encodeChildren(TreeRendererBase.java:299)
 at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:524)
 at com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:244)
 at com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:249)
 at com.sun.facelets.tag.jsf.ComponentSupport.encodeRecursive(ComponentSupport.java:249)
 at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:573)
 at org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
 at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandler.java:229)
 at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:384)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:138)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:234)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63)
 at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
 at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
 at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57)
 at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
 at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79)
 at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
 at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:96)
 at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:220)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
 at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
 at java.lang.Thread.run(Thread.java:595)

I checked what is AbstractTreeDataModel.setWrappedData responsilble for:

 public final void setWrappedData(Object data) {
 wrappedData = (TreeNode) data;
 }

so, I have put a breakpoint there and checked what Object data appear to be. As expected it was my implementation of TreeNode.

package richtest.tree;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.richfaces.component.TreeNode;

public class TreeNodeExample implements TreeNode {

 /**
 *
 */
 private static final long serialVersionUID = 1L;

 private Map<Object, TreeNode> childs;

 private TreeNode parent;

 private String name;

 public TreeNodeExample() {
 childs = new HashMap<Object, TreeNode>();

 }

 public TreeNodeExample(String name) {
 this();
 this.name = name;

 }

 public TreeNodeExample(String name, TreeNode parent) {
 this(name);
 setParent(parent);

 }

 public void addChild(Object id, TreeNode child) {
 getChilds().put(id, child);

 }

 public int getChildsSize() {
 return getChilds().size();
 }

 private Map<Object, TreeNode> getChilds() {
 return this.childs;
 }

 public TreeNode getChild(Object id) {
 return (TreeNode) getChilds().get(id);
 }

 public Iterator getChildren() {
 return getChilds().entrySet().iterator();
 }

 public Object getData() {

 return this;
 }

 public TreeNode getParent() {
 return parent;
 }

 public boolean isLeaf() {
 return getChilds().isEmpty();
 }

 public void removeChild(Object id) {
 TreeNode tmp = getChild(id);
 tmp.setParent(null);
 getChilds().remove(id);

 }

 public void setData(Object arg0) {
 // not used

 }

 public void setParent(TreeNode parent) {
 if (parent != null) {
 TreeNodeExample ex = (TreeNodeExample) parent;
 parent.addChild(ex.getChildsSize(), this);
 }
 this.parent = parent;

 }

 public String getName() {
 return name;
 }

 public void setName(String name) {
 this.name = name;
 }

 public String toString() {
 return name;
 }

}

my page:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<div xmlns="http://www.w3.org/1999/xhtml"
 xmlns:s="http://jboss.com/products/seam/taglib"
 xmlns:ui="http://java.sun.com/jsf/facelets"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:rich="http://richfaces.ajax4jsf.org/rich"
 xmlns:a4j="https://ajax4jsf.dev.java.net/ajax">


 <ui:composition template="/template.xhtml">

 <ui:define name="body">
 <f:view>
 <h:form>
 <div>

 <rich:tree width="300" height="150"
 value="#{treeExample.data}" var="item" nodeFace="test">
 <rich:treeNode type="test">
 <h:outputText value="#{item.name}" />
 </rich:treeNode>
 </rich:tree>

 </div>

 </h:form>
 </f:view>
 </ui:define>
 </ui:composition>

</div>

the template

<?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:ui="http://java.sun.com/jsf/facelets"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:rich="http://richfaces.ajax4jsf.org/rich">
 <head>
 <meta http-equiv="Content-Type"
 content="text/html; charset=iso-8859-1" />
 <meta http-equiv="expires" content="0" />
 <title>Test</title>

 <style type="text/css">
/* a lot of classes */
</style>

 </head>

 <body>

 <h:form>
 <rich:toolBar itemSeparator="line">
 <rich:toolBarGroup itemSeparator="grid">

 <h:commandLink value="simple" action="/slider.seam" />
 <h:commandLink value="tree" action="/tree.seam" />
 <h:commandLink value="table" action="/table.seam" />
 </rich:toolBarGroup>

 </rich:toolBar>
 </h:form>
 <ui:insert name="body">
 TOPNAV
 </ui:insert>
 </body>
</html>

and the stateful bean

package richtest.tree;

import javax.ejb.Remove;
import javax.ejb.Stateful;

import org.jboss.seam.annotations.Destroy;
import org.jboss.seam.annotations.Name;

@Stateful
@Name("treeExample")
public class TreeManager implements ITreeManager {

 private TreeNodeExample root;

 @Remove
 @Destroy
 public void destroy() {

 }

 public Object getData() {
 if (root == null)
 init();

 return root;
 }

 private void init() {

 this.root = new TreeNodeExample("root");
 for (int i = 0; i < 6; i++) {
 TreeNodeExample item = new TreeNodeExample("item" + i, root);
 }


 }
}

with it's inteface

package richtest.tree;

import javax.ejb.Local;


@Local
public interface ITreeManager {

 public void destroy();



 public Object getData();
}

please, help ;)

[nbelaevski]

Hello!

That can happen if classes were loaded by different class loaders. Can you please check that?

What application server are you using?

[kot.filemon]

"nbelaevski" wrote:
Hello!

That can happen if classes were loaded by different class loaders. Can you please check that?

What application server are you using?

JBoss AS 4.0.5 GA.

I have looked at my configuration files and .ear file structure and I don't see any potential problems with class loaders. Could you, please, check it?

faces-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- JSF 1.1 -->
<!DOCTYPE faces-config
 PUBLIC "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.0//EN"
 "http://java.sun.com/dtd/web-facesconfig_1_0.dtd">
<faces-config>
 <lifecycle>
 <phase-listener>
 org.jboss.seam.jsf.TransactionalSeamPhaseListener
 </phase-listener>
 </lifecycle>
</faces-config>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

 <!-- Ajax4jsf (must come first!) -->

 <filter>
 <display-name>Ajax4jsf Filter</display-name>
 <filter-name>ajax4jsf</filter-name>
 <filter-class>org.ajax4jsf.Filter</filter-class>
 </filter>

 <filter-mapping>
 <filter-name>ajax4jsf</filter-name>
 <url-pattern>*.seam</url-pattern>
 </filter-mapping>

 <context-param>
 <param-name>org.ajax4jsf.VIEW_HANDLERS</param-name>
 <param-value>
 org.jboss.seam.ui.facelet.SeamFaceletViewHandler
 </param-value>
 </context-param>
 <filter-mapping>

 <filter-name>ajax4jsf</filter-name>

 <servlet-name>Faces Servlet</servlet-name>

 <dispatcher>REQUEST</dispatcher>

 <dispatcher>FORWARD</dispatcher>

 <dispatcher>INCLUDE</dispatcher>

 </filter-mapping>

 <context-param>

 <param-name>org.ajax4jsf.SKIN</param-name>

 <param-value>blueSky</param-value>

 </context-param>
 <!-- Seam -->

 <listener>
 <listener-class>
 org.jboss.seam.servlet.SeamListener
 </listener-class>
 </listener>

 <servlet>
 <servlet-name>Seam Resource Servlet</servlet-name>
 <servlet-class>
 org.jboss.seam.servlet.ResourceServlet
 </servlet-class>
 </servlet>

 <servlet-mapping>
 <servlet-name>Seam Resource Servlet</servlet-name>
 <url-pattern>/seam/resource/*</url-pattern>
 </servlet-mapping>

 <filter>
 <filter-name>Seam Filter</filter-name>
 <filter-class>org.jboss.seam.web.SeamFilter</filter-class>
 </filter>

 <filter-mapping>
 <filter-name>Seam Filter</filter-name>
 <url-pattern>/*</url-pattern>
 </filter-mapping>

 <!-- JSF -->

 <context-param>
 <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
 <param-value>client</param-value>
 </context-param>

 <context-param>
 <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
 <param-value>.xhtml</param-value>
 </context-param>

 <context-param>
 <param-name>facelets.DEVELOPMENT</param-name>
 <param-value>true</param-value>
 </context-param>

 <servlet>
 <servlet-name>Faces Servlet</servlet-name>
 <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
 <load-on-startup>1</load-on-startup>
 </servlet>

 <servlet-mapping>
 <servlet-name>Faces Servlet</servlet-name>
 <url-pattern>*.seam</url-pattern>
 </servlet-mapping>

 <!-- MyFaces -->
 <listener>
 <listener-class>
 org.apache.myfaces.webapp.StartupServletContextListener
 </listener-class>
 </listener>
</web-app>

the structed of ear [as I see it in Eclipse]

RichFaces.ear
|+ richfaces-3.0.0.jar
|+ jboss-seam.jar
|+ lib
 |+ ajax4jsf-1.1.0.jar
 |+ el-api.jar
 |+ el-ri.jar
 |+ jbpm-3.1.4.jar
 |+ oscache.jar
|+RichFacesEJB.jar
 |+ ajax4jsf-1.1.0.jar
 |+ el-api.jar
 |+ el-ri.jar
 |+ jbpm-3.1.4.jar
 |+ oscache.jar
 |+ richfaces-3.0.0.jar
 |+ jboss-seam.jar
 |+hibernate-all.jar
 |+ jboss-ejb3-all.jar
|+ RichFacesWeb.war
 |+ WEB-INF
 |+ lib
 |+ ajax4jsf-1.1.0.jar
 |+ el-api.jar
 |+ el-ri.jar
 |+ oscache.jar
 |+ richfaces-3.0.0.jar
 |+ jboss-seam-ui.jar
 |+ jboss-seam-debug.jar
 |+ jsf-facelets.jar
 |+ standart.jar
 |+ jboss-seam.jar
 |+ jstl.jar

[kot.filemon]

I have edited the server/default/deploy/jbossweb-tomcat55.sar/META-INF/jboss-service.xml

and changed Java2ClassLoadingCompliance and UseJBossWebLoader from false to true, and suddenly, the error disappeared.