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Jboss portal 2.7.2 portlet ClassCast Exception
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created by <a href="http://community.jboss.org/people/dpoddar">Debopam Poddar</a> in <i>JBoss Portal</i> - <a href="http://community.jboss.org/message/538183#538183">View the full discussion</a>
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<div class="jive-rendered-content"><p>I am new to portlet developmet. I was trying to develop and deploy simple portlet in Jboss portal 2.7.2 and Jboss AS 4.2.3/</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Following is the code</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Portlet extending GenericPortlet</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>package com.sampleportlet;<br/><br/>import java.io.IOException;<br/><br/>import javax.portlet.ActionRequest;<br/>import javax.portlet.ActionResponse;<br/>import javax.portlet.GenericPortlet;<br/>import javax.portlet.PortletConfig;<br/>import javax.portlet.PortletException;<br/>import javax.portlet.PortletRequestDispatcher;<br/>import javax.portlet.RenderRequest;<br/>import javax.portlet.RenderResponse;<br/>import javax.portlet.UnavailableException;<br/><br/><br/><br/>public class First extends GenericPortlet {<br/><br/>    <br/>    <br/>    public void init(PortletConfig portletConfig) throws UnavailableException,<br/>            PortletException {<br/>        super.init(portletConfig);<br/>    }<br/><br/>    /**<br/>     * Helper method to serve up the mandatory view mode.<br/>     */<br/>    protected void doHelp(RenderRequest request, RenderResponse response)<br/>            throws PortletException, IOException {<br/>        response.setContentType("text/html");<br/>        PortletRequestDispatcher dispatcher = getPortletContext()<br/>                .getRequestDispatcher("/WEB-INF/jsp/First_help.jsp");<br/>        dispatcher.include(request, response);<br/>    }<br/><br/>    /**<br/>     * Helper method to serve up the mandatory view mode.<br/>     */<br/>    protected void doEdit(RenderRequest request, RenderResponse response)<br/>            throws PortletException, IOException {<br/>        response.setContentType("text/html");<br/>        PortletRequestDispatcher dispatcher = getPortletContext()<br/>                .getRequestDispatcher("/WEB-INF/jsp/First_edit.jsp");<br/>        dispatcher.include(request, response);<br/>    }<br/><br/>    /**<br/>     * Helper method to serve up the mandatory view mode.<br/>     */<br/>    protected void doView(RenderRequest request, RenderResponse response)<br/>            throws PortletException, IOException {<br/>        response.setContentType("text/html");<br/><br/>        String name = (String) request.getParameter("name");<br/><br/>        if (name != null) {<br/>            PortletRequestDispatcher reqDispatcher = getPortletContext()<br/>                    .getRequestDispatcher("/WEB-INF/jsp/First_view.jsp");<br/>            request.setAttribute("name", name);<br/>            reqDispatcher.include(request, response);<br/>        } else {<br/>            PortletRequestDispatcher reqDispatcher = getPortletContext()<br/>                    .getRequestDispatcher("/WEB-INF/jsp/First_edit.jsp");<br/>            reqDispatcher.include(request, response);<br/>        }<br/>    }<br/><br/>    public void processAction(ActionRequest actionRequest,<br/>            ActionResponse actionResponse) throws PortletException,<br/>            IOException, UnavailableException {<br/>        String name = (String) actionRequest.getParameter("name");<br/><br/>        // send name back to view<br/>        actionResponse.setRenderParameter("name", name);<br/>    }<br/><br/>}</p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>WEB-INF/portlet.xml</p><blockquote class="jive-quote"><p><?xml version="1.0" encoding="UTF-8"?><br/><span><portlet-app xmlns="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd" target="_blank">http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd</a><span>"</span><br/><span>    xmlns:xsi="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a><span>"</span><br/><span>    xsi:schemaLocation="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd" target="_blank">http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd</a><span> </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd" target="_blank">http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd</a><span>"</span><br/>    version="2.0"><br/>    <portlet><br/>        <portlet-name>FirstJspPortlet</portlet-name><br/>        <display-name>First Portlet</display-name><br/>        <portlet-class>com.sampleportlet.First</portlet-class><br/>        <supports><br/>            <mime-type>text/html</mime-type><br/>            <portlet-mode>VIEW</portlet-mode><br/>            <portlet-mode>EDIT</portlet-mode><br/>            <portlet-mode>HELP</portlet-mode><br/>        </supports><br/>        <portlet-info><br/>            <title>First Portlet</title><br/>        </portlet-info><br/>    </portlet><br/>    <br/></portlet-app></p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>WEB-INF/portlet-instances.xml</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p><?xml version="1.0" standalone="yes"?><br/><deployments><br/>   <deployment><br/>         <instance><br/>            <instance-id>FirstPortletInstance</instance-id><br/>            <portlet-ref>FirstJspPortlet</portlet-ref><br/>         </instance><br/>   </deployment><br/></deployments></p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>WEB-INF/firstjspportlet-object.xml</p><blockquote class="jive-quote"><p><?xml version="1.0" encoding="UTF-8"?><br/><deployments><br/>    <deployment><br/>        <if-exists>overwrite</if-exists><br/>        <parent-ref>default.default</parent-ref><br/>        <window><br/>            <window-name>FirstPortletWindow</window-name><br/>            <content><br/>                <content-type>portlet</content-type><br/>                <content-uri>FirstPortletInstance</content-uri><br/>            </content><br/>            <region>center</region><br/>            <height>1</height><br/>        </window><br/>    </deployment><br/></deployments></p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>WEB-INF/Jboss-portlet.xml</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p><?xml version="1.0" encoding="UTF-8"?><br/><!DOCTYPE portlet-app PUBLIC "-//JBoss Portal//DTD JBoss Portlet 2.6//EN"<br/><span>        "</span><a class="jive-link-external-small" href="http://www.jboss.org/portal/dtd/jboss-portlet_2_6.dtd" target="_blank">http://www.jboss.org/portal/dtd/jboss-portlet_2_6.dtd</a><span>"></span><br/><br/><portlet-app><br/>   <remotable>true</remotable><br/>   <portlet><br/>      <portlet-name>FirstJspPortlet</portlet-name><br/>   </portlet><br/></portlet-app></p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Error I am getting is</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>2010-04-18 22:09:22,953 DEBUG [org.jboss.portal.portlet.container.com_sampleportlet_First] Loading portlet class com.sampleportlet.First<br/>2010-04-18 22:09:22,958 DEBUG [org.jboss.portal.portlet.container.com_sampleportlet_First] Creating portlet object com.sampleportlet.First<br/>2010-04-18 22:09:22,962 ERROR [org.jboss.portal.portlet.impl.container.LifeCycle] Cannot start object<br/>org.jboss.portal.portlet.container.PortletInitializationException: The portlet FirstJspPortlet threw a runtime exception during init<br/>    at org.jboss.portal.portlet.impl.jsr168.PortletContainerImpl.start(PortletContainerImpl.java:288)<br/>    at org.jboss.portal.portlet.impl.container.PortletContainerLifeCycle.invokeStart(PortletContainerLifeCycle.java:76)<br/>    at org.jboss.portal.portlet.impl.container.LifeCycle.managedStart(LifeCycle.java:92)<br/>    at org.jboss.portal.portlet.impl.container.PortletApplicationLifeCycle.startDependents(PortletApplicationLifeCycle.java:351)<br/>    at org.jboss.portal.portlet.impl.container.LifeCycle.managedStart(LifeCycle.java:128)<br/>    at org.jboss.portal.portlet.deployment.jboss.PortletAppDeployment.start(PortletAppDeployment.java:226)<br/>    at org.jboss.portal.core.deployment.jboss.PortletAppDeployment.start(PortletAppDeployment.java:94)<br/>    at org.jboss.portal.server.deployment.jboss.DeploymentContext.start(DeploymentContext.java:99)<br/>    at org.jboss.portal.server.deployment.jboss.PortalDeploymentInfoContext.start(PortalDeploymentInfoContext.java:220)<br/>    at org.jboss.portal.server.deployment.jboss.ServerDeployer.start(ServerDeployer.java:217)<br/>    at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1025)<br/>    at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:819)<br/>    at sun.reflect.GeneratedMethodAccessor212.invoke(Unknown Source)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br/>    at java.lang.reflect.Method.invoke(Method.java:585)<br/>    at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)<br/>    at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)<br/>    at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)<br/>    at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)<br/>    at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)<br/>    at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)<br/>    at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)<br/>    at $Proxy222.deploy(Unknown Source)<br/>    at org.jboss.portal.server.deployment.jboss.ServerDeployer.deploy(ServerDeployer.java:259)<br/>    at org.jboss.portal.server.deployment.WebAppAdapter.deploy(WebAppAdapter.java:53)<br/>    at org.jboss.portal.server.deployment.WebAppIntercepter.handleNotification(WebAppIntercepter.java:159)<br/>    at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br/>    at java.lang.reflect.Method.invoke(Method.java:585)<br/>    at org.jboss.mx.notification.NotificationListenerProxy.invoke(NotificationListenerProxy.java:153)<br/>    at $Proxy224.handleNotification(Unknown Source)<br/>    at org.jboss.mx.util.JBossNotificationBroadcasterSupport.handleNotification(JBossNotificationBroadcasterSupport.java:127)<br/>    at org.jboss.mx.util.JBossNotificationBroadcasterSupport.sendNotification(JBossNotificationBroadcasterSupport.java:108)<br/>    at org.jboss.deployment.SubDeployerSupport.emitNotification(SubDeployerSupport.java:340)<br/>    at org.jboss.deployment.SubDeployerSupport.start(SubDeployerSupport.java:308)<br/>    at org.jboss.web.AbstractWebContainer.start(AbstractWebContainer.java:482)<br/>    at sun.reflect.GeneratedMethodAccessor105.invoke(Unknown Source)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br/>    at java.lang.reflect.Method.invoke(Method.java:585)<br/>    at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)<br/>    at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)<br/>    at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)<br/>    at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)<br/>    at org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:97)<br/>    at org.jboss.system.InterceptorServiceMBeanSupport.invokeNext(InterceptorServiceMBeanSupport.java:238)<br/>    at org.jboss.wsf.container.jboss42.DeployerInterceptor.start(DeployerInterceptor.java:87)<br/>    at org.jboss.deployment.SubDeployerInterceptorSupport$XMBeanInterceptor.start(SubDeployerInterceptorSupport.java:188)<br/>    at org.jboss.deployment.SubDeployerInterceptor.invoke(SubDeployerInterceptor.java:95)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)<br/>    at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)<br/>    at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)<br/>    at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)<br/>    at $Proxy202.start(Unknown Source)<br/>    at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1025)<br/>    at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:819)<br/>    at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782)<br/>    at sun.reflect.GeneratedMethodAccessor26.invoke(Unknown Source)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br/>    at java.lang.reflect.Method.invoke(Method.java:585)<br/>    at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)<br/>    at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)<br/>    at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)<br/>    at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)<br/>    at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)<br/>    at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)<br/>    at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)<br/>    at $Proxy9.deploy(Unknown Source)<br/>    at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:421)<br/>    at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:634)<br/>    at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:263)<br/>    at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:336)<br/>    at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)<br/>    at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)<br/>    at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br/>    at java.lang.reflect.Method.invoke(Method.java:585)<br/>    at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)<br/>    at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)<br/>    at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)<br/>    at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)<br/>    at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)<br/>    at $Proxy0.start(Unknown Source)<br/>    at org.jboss.system.ServiceController.start(ServiceController.java:417)<br/>    at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br/>    at java.lang.reflect.Method.invoke(Method.java:585)<br/>    at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)<br/>    at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)<br/>    at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)<br/>    at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)<br/>    at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)<br/>    at $Proxy4.start(Unknown Source)<br/>    at org.jboss.deployment.SARDeployer.start(SARDeployer.java:304)<br/>    at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1025)<br/>    at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:819)<br/>    at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782)<br/>    at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:766)<br/>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br/>    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)<br/>    at java.lang.reflect.Method.invoke(Method.java:585)<br/>    at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)<br/>    at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)<br/>    at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)<br/>    at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)<br/>    at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)<br/>    at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)<br/>    at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)<br/>    at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)<br/>    at $Proxy5.deploy(Unknown Source)<br/>    at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:482)<br/>    at org.jboss.system.server.ServerImpl.start(ServerImpl.java:362)<br/>    at org.jboss.Main.boot(Main.java:200)<br/>    at org.jboss.Main$1.run(Main.java:508)<br/>    at java.lang.Thread.run(Thread.java:613)<br/>Caused by: java.lang.ClassCastException: com.sampleportlet.First<br/>    at org.jboss.portal.portlet.impl.jsr168.PortletContainerImpl.start(PortletContainerImpl.java:254)</p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Please let me know what needs to be changed.</p></div>
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