I've been working for the last few years at BEA Systems and now at Oracle. Plenty of application development and testing has involved using projects within EARs.
I've always taken APP-INF/lib for granted and didn't look at the history of it. It was provided by BEA Systems for WebLogic Server to easily share libraries and other utility classes. among enclosed projects.
As an aside, another BEAism was the use of web services conversations (begin, continue, end) - easily mocked up with service controls. Where did that go with the new JAX-WS spec?
Going back to APP-INF/lib there was a good writeup of WebLogic to Glassfish.
http://weblogs.java.net/blog/sekhar/archive/2009/03/weblogic_to_gla.html
It will be interesting to see where it goes from here once the merger of Sun and Oracle occurs.
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