Need Help

Tue, 08 Nov 2005 06:46:18 -0800

I am a beginner of portlets. I tried a very very simple HelloWorld portlet ( the source from onjava.com) like this:
 
package com.test;
 
import javax.portlet.*;
 
import java.io.IOException;
 
public class HelloWorld extends GenericPortlet{
 
 protected void doView(RenderRequest request, RenderResponse response)
  throws PortletException, IOException{
   response.setContentType("text/html");
   response.getWriter().println("Hello Portlet");
  }
 
}
 
portlet.xml file :
 
<?xml version="1.0" encoding="UTF-8"?>
<portlet-app
    xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"
    version="1.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd
                        http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd">
  
   <portlet-app-name>HelloWold</portlet-app-name>
                    
 <portlet>
        <description>HelloWorldDescription</description>
  
        <portlet-name>HelloWorld</portlet-name>
  
        <display-name>Hello World</display-name>
  
        <portlet-class>com.test.HelloWorld</portlet-class>
        
        <expiration-cache>-1</expiration-cache>
         
        <supports>
   <mime-type>text/html</mime-type>
            <portlet-mode>VIEW</portlet-mode>
   </supports>
 
        <supported-locale>en</supported-locale>       
 
  <portlet-info>
   <title>Hello World</title>
   <short-title>Hello World</short-title>
   <keywords>Hello</keywords>
        </portlet-info>
 </portlet>
</portlet-app>
web.xml is:
 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
                         "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
    <display-name>HelloWorld</display-name>
    <welcome-file-list>
     <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>
I installed the Pluto-1.0.1, the deployment from the admin is successful. But if I'd like to open the HelloWorld portlet, it says always 'error occured in portlet'. I checked the log file, it shows sth like this:
 
08.11.2005 10:09:26 org.apache.pluto.portalImpl.services.log.LoggerImpl error
SCHWERWIEGEND: PortletInvokerImpl.render() - Error while dispatching portlet.
java.lang.ClassCastException: com.test.HelloWorld
 at org.apache.pluto.core.PortletServlet.init(PortletServlet.java:66)
 at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1091)
 at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:750)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:641)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.invoker.impl.PortletInvokerImpl.invoke(PortletInvokerImpl.java:120)
 at org.apache.pluto.invoker.impl.PortletInvokerImpl.load(PortletInvokerImpl.java:80)
 at org.apache.pluto.PortletContainerImpl.portletLoad(PortletContainerImpl.java:218)
 at org.apache.pluto.portalImpl.core.PortletContainerWrapperImpl.portletLoad(PortletContainerWrapperImpl.java:94)
 at org.apache.pluto.portalImpl.aggregation.PortletFragment.service(PortletFragment.java:120)
 at org.apache.jsp.WEB_002dINF.aggregation.ColumnFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.ColumnFragment_jsp:65)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
 at org.apache.jsp.WEB_002dINF.aggregation.RowFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.RowFragment_jsp:65)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
 at org.apache.jsp.WEB_002dINF.aggregation.PageFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.PageFragment_jsp:74)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
 at org.apache.jsp.WEB_002dINF.aggregation.RootFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.RootFragment_jsp:136)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
 at org.apache.pluto.portalImpl.Servlet.doGet(Servlet.java:254)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 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.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
 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:856)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
 at java.lang.Thread.run(Thread.java:595)
08.11.2005 10:09:26 org.apache.pluto.portalImpl.services.log.LoggerImpl error
SCHWERWIEGEND: Error in Portlet
javax.portlet.PortletException
 at org.apache.pluto.invoker.impl.PortletInvokerImpl.invoke(PortletInvokerImpl.java:146)
 at org.apache.pluto.invoker.impl.PortletInvokerImpl.load(PortletInvokerImpl.java:80)
 at org.apache.pluto.PortletContainerImpl.portletLoad(PortletContainerImpl.java:218)
 at org.apache.pluto.portalImpl.core.PortletContainerWrapperImpl.portletLoad(PortletContainerWrapperImpl.java:94)
 at org.apache.pluto.portalImpl.aggregation.PortletFragment.service(PortletFragment.java:120)
 at org.apache.jsp.WEB_002dINF.aggregation.ColumnFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.ColumnFragment_jsp:65)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
 at org.apache.jsp.WEB_002dINF.aggregation.RowFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.RowFragment_jsp:65)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
 at org.apache.jsp.WEB_002dINF.aggregation.PageFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.PageFragment_jsp:74)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
 at org.apache.jsp.WEB_002dINF.aggregation.RootFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.RootFragment_jsp:136)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
 at org.apache.pluto.portalImpl.Servlet.doGet(Servlet.java:254)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 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.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
 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:856)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
 at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.ClassCastException: com.test.HelloWorld
 at org.apache.pluto.core.PortletServlet.init(PortletServlet.java:66)
 at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1091)
 at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:750)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:641)
 at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
 at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
 at org.apache.pluto.invoker.impl.PortletInvokerImpl.invoke(PortletInvokerImpl.java:120)
 ... 74 more
...
 
Could somebody help me?  Please!!! I am going to getting crazy. Thank you!
 
regards, Min

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