All java is opensource?
I found the best "free?" java-class decompiler
jad.
Copyright 2000 Pavel Kouznetsov kpdus@yahoo.com
Here is the version Jad v1.5.7g.
  my java investigation (sources inside) | 
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| Java Doc Server | This is a tiny http server :) to make search in JavaDoc generated documentation. | 
| Java Cascade Proxy | This is a tiny http proxy redirector to make auto authentication for proxy server, to hide destination address (replace readable host by the dot-address), and to restict bunners. |