What I've changed in JForum:
* copied jboss-cache.jar to the WEB-INF/lib of KnowForum.
* copied jboss-system.jar to the WEB-INF/lib of KnowForum.
* copied jboss-common.jar to the WEB-INF/lib of KnowForum.
* downloaded and copied jgroups-all.jar to WEB-INF/lib of KnowForum.
* copied log4j.dtd to WEB-INF dir.
* deleted:
* net.jforum.drivers.oracle.


Other Java Forum software:
* http://www.jgossip.org/jgossip/Main.do;jsessionid=4759476EBD299E59C8A8079F1C85B663
* http://www.daniel-lemire.com/phorum-5.0.13a/index.php?3
* https://sourceforge.net/projects/lucane/