EJB + ClassCastException

Question

what does this error mean
java.lang.ClassCastException: org.apache.tomcat.core.HttpServletRequestFacade?
I get it when I run my custom EJB.
the class files are as follows
Remote Interface:
     package ejbdotone;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.ejb.EJBObject;
import java.rmi.RemoteException;
import java.io.PrintWriter;
import java.util.Iterator;
public interface PrintForm extends EJBObject {
     public PrintFormWrapper createForm( HttpServletRequest req )
                                           throws RemoteException;
}Home Interface:
package ejbdotone;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBHome;
public interface PrintFormHome extends EJBHome {
                  PrintForm create() throws CreateException, RemoteException;
}Bean Implementation:
package ejbdotone;
import javax.servlet.*;
import javax.servlet.http.*;
import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import java.util.Iterator;
import java.io.PrintWriter;
public class PrintFormBean implements SessionBean {
          public PrintFormWrapper createForm( HttpServletRequest req ) {
               String nameStr = req.getParameter("$1");
               String phoneStr = req.getParameter("$2");
               String addStr = req.getParameter("$3");
               PrintFormWrapper wrapper =
                    new PrintFormWrapper(nameStr, phoneStr, addStr);
               return wrapper;
                  public void ejbCreate() { }
                  public void setSessionContext(SessionContext ctx) { }
                  public void ejbRemove() { }
                  public void ejbActivate() { }
                  public void ejbPassivate() { }
                  public void ejbLoad() { }
                  public void ejbStore() { }
}Serialized Wrapper:
package ejbdotone;
import java.io.Serializable;
public class PrintFormWrapper implements Serializable {
     public String name, phone, address;
     public PrintFormWrapper( String name, String phone, String address ) {
          this.name=name;
          this.phone=phone;
          this.address=address;
}Servlet Class:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
import ejbdotone.*;
public class PrintFormServlet extends HttpServlet {
     PrintFormHome printHome;
     public void init(ServletConfig config)
               throws ServletException{
          try{
               InitialContext ctx = new InitialContext();
               Object objref = ctx.lookup("formprinter");
               System.out.println("REF: "+objref.getClass());
               printHome =
                    (PrintFormHome)PortableRemoteObject.narrow(
                                        objref, PrintFormHome.class);
               System.out.println("HOME: "+printHome.getClass());
          } catch (Exception NamingException) {
               System.out.println("INIT: "+ NamingException );
        public void doGet ( HttpServletRequest request,
                                      HttpServletResponse response)
                                      throws ServletException, IOException {
          PrintWriter out;
          response.setContentType("text/html");
          out = response.getWriter();
          try{
               PrintForm printer;
               printer = (PrintForm)printHome.create();
               System.out.println("REMOTE: "+printer.getClass());
               PrintFormWrapper wrapper =
                    (PrintFormWrapper)printer.createForm( request );
               System.out.println("WRAPPER: "+wrapper.getClass());
               out.println(wrapper.name);
               out.println(wrapper.phone);
               out.println(wrapper.address);
          } catch(Exception CreateException){
               System.out.println("doGet: "+CreateException);
          } finally {
               if(out != null) {
                    out.close();
          if(out != null) {
               out.close();
     public void destroy() {                 
          System.out.println("Destroy");
}When I run it it prints out the following to stderr:
REF: class ejbdotone._PrintFormHome_Stub
HOME: class ejbdotone._PrintFormHome_Stub
REMOTE: class ejbdotone._PrintForm_Stub
and then the class-cast error message from above.
This is my first EJB away from the tutorial. It is a stateless session bean. It verifies and deploys with no errors through the deploytool.
Any help will be much appreciated.
Thank you,
Ian

Answer 1

Here it is:
java.lang.ClassCastException: org.apache.tomcat.core.HttpServletRequestFacade
     at ejbdotone._PrintForm_Stub.createForm(Unknown Source)
     at PrintFormServlet.doGet(PrintFormServlet.java:40)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.tomcat.core.ServiceInvocationHandler.method(ServletWrapper.java:626)
     at org.apache.tomcat.core.ServletWrapper.handleInvocation(ServletWrapper.java:534)
     at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:378)
     at org.apache.tomcat.core.Context.handleRequest(Context.java:644)
     at org.apache.tomcat.core.ContextManager.service(ContextManager.java:440)
     at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:144)
     at org.apache.tomcat.service.TcpConnectionThread.run(TcpEndpoint.java:310)
     at java.lang.Thread.run(Thread.java:484)