The war file contains the jakarta-regexp-1.4.jar library; does anyone know what that's needed for? JForum itself doesn't use it, and running the web app without it seems to work fine (although I'm sure I haven't done an exhaustive test).

Hi udittmer,
I check the maven dependency tree:
lucene-highlighter-3.6.2.jar->lucene-queries-3.6.2.jar->jarkarta-regexp-1.4.jar
You'll need to check the lucene features if this jar was removed.