Puzzling include problem

[Mike Slinn]

The following results in Jasper throwing NullPointerException when I try to
include a JSP's output into a servlet's output by calling the following
routine in the servlet code:

void include(String path, HttpServletRequest req, HttpServletResponse res)
            throws ServletException {
    javax.servlet.RequestDispatcher rd = req.getRequestDispatcher(path);
    if (rd==null)
        throw new ServletException(null RequestDispatcher");
    try {
        rd.include(req, res);
    } catch (java.io.IOException e) {
        throw new ServletException ("IO Exception", e);
    } catch (java.lang.IllegalStateException e) {
        throw new ServletException (
            "Response was already committed", e);
    } catch (ServletException e) {
        throw new ServletException (Servlet exception<br>",
            e.getRootCause());
    }
}

Any idea what the problem is?  The complete error message is:

Internal Servlet Error:

javax.servlet.ServletException:
Sequencer.include(D:\JavaProjects\TomcatDocs\webapp\sessions\1x82j0rsy1.jsp)
: servlet exception
        at com.mslinn.Sequencer.include(Sequencer.java:126)
        at com.mslinn.Sequencer.doService(Sequencer.java:91)
        at com.mslinn.Sequencer.doPost(Sequencer.java:30)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
        at org.apache.tomcat.core.Handler.service(Handler.java:286)
        at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:79
7)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
        at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
onnectionHandler.java:210)
        at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
        at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
        at java.lang.Thread.run(Thread.java:484)

Root cause:
java.lang.NullPointerException
        at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.ja
va:199)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
        at org.apache.tomcat.core.Handler.service(Handler.java:286)
        at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at
org.apache.tomcat.facade.RequestDispatcherImpl.include(RequestDispatcherImpl
.java:345)
        at com.mslinn.Sequencer.include(Sequencer.java:119)
        at com.mslinn.Sequencer.doService(Sequencer.java:91)
        at com.mslinn.Sequencer.doPost(Sequencer.java:30)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
        at org.apache.tomcat.core.Handler.service(Handler.java:286)
        at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:79
7)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
        at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
onnectionHandler.java:210)
        at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
        at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
        at java.lang.Thread.run(Thread.java:484)


Mike Slinn