JAMwiki is a state-of-the-art reimplementation of Mediawiki in Java (servlet 2.3 and Java 1.5 compatibility). It can be run with or without a database and is designed to be fast and easy to set up.
JAM is not the same implementation but supports most of MediaWiki syntax, including advanced constructs like templates. It runs inside Apache Tomcat, Glassfish or similar server.
