java documentation tool

Can anyone point me at a java source to html tool? something like LXR, but for java.

I've found Xref-Java2Html, but I didn't think it was that great:

• It's GUI-driven, and this is for a server-side project
• it's not very configurable, and since I use a tabsize of 4, it made my code look silly
• it's not Free (which isn't essential but is nice).

Thanks! :-)