Introduction - If you have any usage issues, please Google them yourself
Download the Java Debugger and unzip it into its own directory (eg: d:jddb)
Add d:jddb to your path, or copy d:jddbjddb.cmd into your path.
Modify the first 3 lines of jddb.cmd to reflect the directories that you installed jddb and jdk1.3 into:
setlocal
set _jdk2_=x:jdk1.3
set _jddb_=x:jddb
To debug, replace "java" with "jddb" when you start a java program