RE: Re: Extending JSF Classloader

From: Freire, Jose Luis (PT - Lisbon) <"Freire,>
Date: Mon, 25 Jun 2007 20:36:52 +0100

Hello Imre,

Thank you very much for your answer. I've taken your solution one step further. Instead of building a filter, I've build a PhaseListener and added my classloader like this:

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;

public class ClassLoaderPhaseListener implements PhaseListener {

        private static final Log logger = LogFactory.getLog(ClassLoaderPhaseListener.class);

        private static final long serialVersionUID = 1L;

        public void beforePhase(PhaseEvent arg0) {
      "Setting classloader for this thread");
      "Current Classloader:" + contextClassLoader.getClass().getName());
                ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
                Thread.currentThread().setContextClassLoader(new MyClassLoader(contextClassLoader));

        public void afterPhase(PhaseEvent arg0) {
                // Do Nothing

        public PhaseId getPhaseId() {
                return PhaseId.RESTORE_VIEW;


It works great! Now I only need to build my classloader to search OSGI plugins to find my classes.

I'm aware this is only a workaround to make an OSGI application running on JSF, and would appreciate if anyone could give me some pointers to do this correctly.

Is anyone making any work towards JSF OSGI?



From: Imre Oßwald []
Sent: segunda-feira, 25 de Junho de 2007 14:26
Subject: Re: Extending JSF Classloader

Hello Jose,

while I was experimenting with classloaders in JSF, I had success with Thread.get / setContextClassloader.
The Problem will then be to get hold of every Thread before JSF loads classes. I wrote a Filter to wrap the Classloader of every requests Thread and a ContextListener for the startup of the webapp.

I hope there are better ways to do it, so I am too interested if someone else has a better approach.

(Apart from that probably most appserver have (a non portable) way to define classloaders.

Imre Oßwald

On 25.06.2007, at 13:20, Freire, Jose Luis ((PT - Lisbon)) wrote:

I'm doing some experimental work to run JSF in an OSGI environment and I'm trying a new approach since I'm finding that it's very hard to make JSF a OSGI Bundle, so I'm going for smaller steps.
What is the best way to extend JSF classloader (if one exists...) ?
José Freire
Consulting - Financial Services Industry
Deloitte & Touche, Quality Firm, S.A.

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