Try the file "jb1.0.3.zip" from the usual download location. It'll (hopefully) unpack to a file tree with a "java" directory, containing a "jmri.jpx" file that JBuilder can work from.
Bob
(Who's about to go offline for about 36 hours)
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Bob Jacobsen (Bob_Jacobsen@..., 510-486-7355, fax 510-495-2957)
At CERN until August 10, replies may be slow.
Bob Jacobsen