forward() across webapps

http://hoare.cs.umsl.edu/servlet/j-siegel/contextTest META-INF and context

contextServlet.java in j-siegel

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class contextServlet extends HttpServlet {

    public void doGet(HttpServletRequest req, HttpServletResponse res)
    throws ServletException, IOException
    {
        res.setContentType("text/html;charset=UTF-8");
        ServletContext src = req.getSession().getServletContext();
        ServletContext target = src.getContext("/siegel");   
        RequestDispatcher rd = target.getRequestDispatcher("/Hij-siegel.jsp");
        rd.forward(req, res);
    }
}

Hij-siegel.jsp in siegel

<html>
<head>
<title>Hi j-siegel</title>
</head>
<body>
<center>
   <font size="+3"><b>Hi: j-siegel<br />from siegel</b></font>
</center>
</body>
</html>

context.xml in both /webapp/META-INF and
the contextServlet reference in j-siegel/WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<Context crossContext="true" crossAuth="true">
</Context>

----------------------------------------
<servlet>
        <servlet-name>contextTest</servlet-name>
        <servlet-class>contextServlet</servlet-class>
</servlet>
<servlet-mapping>
        <servlet-name>contextTest</servlet-name>
        <url-pattern>/contextTest</url-pattern>
</servlet-mapping>