Finding Jar external references

From: John Smith (usenet123_at_ntlworld.com)
Date: 06/29/04 

Date: Tue, 29 Jun 2004 14:54:28 +0000 (UTC)

Is it possible to find all the external references classes and methods in a
jar file. I have a file and I want to find out what other jars etc it needs
without having to run it and see what fails.

Many Thanks

Jon