Active development of JAMWiki has ceased, and bug fixes and support will be limited at best. If you are interested in taking over management of JAMWiki please send an email to the jamwiki-devel mailing list.
I currently use JAMWiki as a catch-all for all my busines, programming and reading ideas and thoughts as well as a ToDo list. I just run it locally off my laptop and that way its always with me.
I've had a brief browse through the source, but to date have only modded my local instance of edit.jsp to add a 'cancel' button
Would definitely like to contribute to JAMWiki when I can