Dick Chase created a nice but simple Java IDE. He has now discontinued development of it, but has permitted me to mirror it here. It is free for academic use.
Download the executable
Download the sources (Delphi 3)
Set it up
Note that it does not do source coloring. Its main advantage is that it will work with any version of the JDK. You just have to tell it where your JDK is.
Last Updated: January 31, 2002