how to attach javaee source to eclipse class editor

[jimgardener]

hi,
I am a recent entrant to javaee,and I use eclipse helios as IDE.

Generally when you place mouse cursor on a java class name ,eclipse
opens a small window with javadoc help for that class.I am not sure
what this feature is named.With java ,I had to attach source in class
file editor to enable this.

I want to do this for javaee also..but I could not find any source
(since javaee is a specification and has no source code as such?).Can
someone tell me how I can get this help in eclipse?
thanks
jim