help in error ClassCastException

[Zhonghui Ning]

Hello everyone,
I want to implement a portlet in jetspeed 2 + tomcat 5.0.28 + linux. My code can compile but I got a runtime error. The error is java.lang.ClassCastException: org.apache.jetspeed.container.JetspeedPortletConfig.The error part of my code is in the following. 

Any help? Thanks.
Zhonghui
// PortletConfigImpl.java
package com.star.portlet;
import javax.portlet.PortletConfig;
public class PortletConfigImpl implements PortletConfig {
......
}
// StrutsPortlet.java 

package com.star.portlet;
import javax.portlet.PortletConfig; 
public class StrutsPortlet extends GenericPortlet {

       private PortletConfigImpl _portletConfig;
	public void init(PortletConfig config) throws PortletException {
		super.init(config); 
			
		_portletConfig = (PortletConfigImpl)config;  // Error: java.lang.ClassCastException

                _editAction = getInitParameter("edit-action");
                _helpAction = getInitParameter("help-action");
                _viewAction = getInitParameter("view-action");
                _copyRequestParameters = GetterUtil.get(
                        getInitParameter("copy-request-parameters"), true);
        }
......
}

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