can't fully unload a URLClassLoader


I have a JAR file. I use URLClassLoader to load classes from it. I use com.sun.appserv.ClassLoaderUtil.releaseLoader to release these loaded classes when I've finished with them. But the Java VM keeps the JAR file open (so that I can't delete it, as I'd like to). For small, simple JAR files, the JAR file does close OK.

Is there any way to find out what classes or resources in the JAR file are still in use by the Java VM? I'm developing with Eclipse.

Thanks,

Simon Morris
.

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