wrong cast of PluginURLConnection to JarURLConnection

While trying to run Hudson in jnode, I am getting a ClassCastException (see attached file).
The method whoAmI() in Main class of hudson.war expect that the class is loaded from a jar. The problem is that; in jnode, it's loaded by a PluginClassLoader (with the jnode plugin protocol).

A solution might be that PluginURLConnection inherits from JarURLConnection, if that's possible.

I think that such thing is expected by other third party applications (iirc, ant-launcher is trying to find the location of its jars on disk).

Here is the code of whoAmI from hudson :

public static File whoAmI() throws IOException, URISyntaxException {
URL classFile = Main.class.getClassLoader().getResource("Main.class");

// JNLP returns the URL where the jar was originally placed (like http://hudson.dev.java.net/...)
// not the local cached file. So we need a rather round about approach to get to
// the local file name.
return new File(((JarURLConnection)classFile.openConnection()).getJarFile().getName());
}