Which version of the Java runtime would you recommend, and can I get an older version from Sun's site?
What about using the iSeries System Debugger via the Navigator? Does it function the same as the standalone System Debugger? I tried using it and had no problems debugging a program with an SEP (Service Entry Point).
Try downgrading to an older Java Virtual Machine.
I had lots of problems like this when using the current JVMs.