Error Cast javax.portlet.Portlet

[12年前 に Roberto Rodriguez によって更新されました。]

Hi get this error:

com.sample.jsp.portlet.JSPPortlet cannot be cast to javax.portlet.Portlet


JSPPortlet.java

package com.sample.jsp.portlet;

import java.io.IOException;

import javax.portlet.GenericPortlet;
import javax.portlet.PortletException;
import javax.portlet.PortletRequestDispatcher;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.portlet.ResourceRequest;
import javax.portlet.ResourceResponse;

public class JSPPortlet extends GenericPortlet {

    public void serveResource(ResourceRequest req, ResourceResponse res)
        throws PortletException, IOException {

        boolean logo = true;

        if (logo) {
            
        	System.out.println("hello");
        	
        }
    }

	public void doView(
			RenderRequest renderRequest, RenderResponse renderResponse)
		throws IOException, PortletException {

		PortletRequestDispatcher portletRequestDispatcher =
			getPortletContext().getRequestDispatcher("/view.jsp");

		portletRequestDispatcher.include(renderRequest, renderResponse);

	}
}

liferay-portlet.xml

<!--?xml version="1.0"?-->


<liferay-portlet-app>
	<portlet>
		<portlet-name>ServeResourcePortlet</portlet-name>
		<icon>/icon.png</icon>
		<instanceable>true</instanceable>
		<header-portlet-css>/css/test.css</header-portlet-css>
		<footer-portlet-javascript>/js/test.js</footer-portlet-javascript>
	</portlet>
	<role-mapper>
		<role-name>administrator</role-name>
		<role-link>Administrator</role-link>
	</role-mapper>
	<role-mapper>
		<role-name>guest</role-name>
		<role-link>Guest</role-link>
	</role-mapper>
	<role-mapper>
		<role-name>power-user</role-name>
		<role-link>Power User</role-link>
	</role-mapper>
	<role-mapper>
		<role-name>user</role-name>
		<role-link>User</role-link>
	</role-mapper>
</liferay-portlet-app>

[12年前 に Mani kandan によって更新されました。]

Hi Roberto,

This kind of exception usually happens when some classes are twice on the classpath - e.g. javax.portlet.Portlet in this case. You're inheriting from one but the typecast tries to cast to the other. The message is puzzling, but once you grasp that there are two distinct instances with the same name, it makes a lot more sense.

I guess you deployed too many jars with your own portlet - especially "portlet.jar" should be on the server's classpath, not on the webapp's/portlet's. That's why the default bundle has it in TOMCAT_HOME/lib/ext. It must not go to TOMCAT_HOME/webapps/YOUR_WEBAPP/WEB-INF/lib

[9年前 に Jeet Chatterjee によって更新されました。]

Thanks it worked for me