I *believe* that Equinox/Eclipse uses its own set of disjointed class loaders to implement its osgi bundling system. (OSGi bundling system means you can throw in disjointed pieces of code as bundles and the OSGi framework will dynamically load them and allow them to extend each other). To implement the OSGi part, Equinox/Eclipse uses a strange kind of class loading where each bundle gets its own class loader. So I think the VFS based classloader may not play ball nicely with this kind of setup. Diwant View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4046572#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...