Has anyone done any source level debugging of the JDK classes using jdb or JSwat? It doesn't work out of the box presumably because the JDK is not compiled with -g. I've seen it work with Visual Age Java, but I don't have access to that IDE currently. My next step is to compile the JDK source code myself passing -g to the compiler. I thought perhaps someone else might have done this before me, but google is not turning anything up for me. Mike