[equinox-dev] Server Side problem - Servlet ClassCastException

[sebastien <sebastien@xxxxxxxx>]

Hi,

I'm just trying to build-up a new HTTP/Servlet server based on Equinox.
I followed exactly the instructions on http://www.eclipse.org/equinox/server/http_in_equinox.php
I also created a new bundle, an can access the static resources in this bundle.

I tried then to create a new Servlet named BaseServlet, extending HTTPServlet. Then created a new Extension to the org.eclipse.equinox.http.registry.servlets extension point, then access via my browser.
But it fails on HTTP 500

http://localhost:8080/BaseServlet


HTTP ERROR: 500
org.seij.jenova.server.impl.BaseServlet
RequestURI=/BaseServlet/
Powered by Jetty://

In my console logs I see :

GRAVE: /BaseServlet/:
java.lang.ClassCastException: org.seij.jenova.server.impl.BaseServlet
    at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.initializeDelegate(ServletManager.java:154)
    at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:128)
    at org.eclipse.equinox.http.servlet.internal.ServletRegistration.handleRequest(ServletRegistration.java:91)

Or, I'm sure BaseServlet implements Servlet anyway ( I searched hours )

I tried also to touch the code of org.eclipse.equinox.http.registry.internal.ServletManager, and it appears that IConfigurationElement.createExecutableExtension(CLASS) ( line 143 ) ; returns me  the correct class, but , for an unknown reason, it doesn't casts to Servlet anymore !!!

But with a simple check, I
                    Class[] is = extension.getClass().getInterfaces();
                    for ( int i = 0 ; i < is.length ; i++) {
                        System.out.println(is[i].getName());
                    }
It appears that my class is anyway an implementation of javax.servlet.Servlet

But anyway, the line after my test :

Servlet newDelegate = (Servlet) extension;

Gots the classCastException ....

I'm sorry to bother you with that but I still can't understand. Have we got problems with createExecutableExtension() ??

Complete modified code source for test :

package org.eclipse.equinox.http.registry.internal;
public class ServletManager implements ExtensionPointTracker.Listener {

    ...

        private synchronized void initializeDelegate() throws ServletException {
            if (delegate == null) {
                try {
                    Object extension = element.createExecutableExtension(CLASS);
                    Class[] is = extension.getClass().getInterfaces();
                    for ( int i = 0 ; i < is.length ; i++) {
                        System.out.println(is[i].getName());
                    }
                   
                    Servlet newDelegate = (Servlet) extension;
                    newDelegate.init(config);
                    delegate = newDelegate;
                } catch (CoreException e) {
                    throw new ServletException(e);
                }
            }
        }

    ...

}

Can someone help ?

Thank you

Sébastien JUST