How to get Java Decompiler / JD / JD-Eclipse running in Eclipse Helios

Question

Java Decompiler (JD) is generally recommended as a good, well, Java Decompiler. JD-Eclipse is the Eclipse plugin for JD.

I had problems on several different machines

Answer 1

After testing on Juno, Kepler and Luna, I found JD only works for *.class files on build path.

1. Adding the jar as a lib of an existing project
2. Go to Preferences->General->Editors->File Associations, set *.class without source to Class File Editor with a cup icon