All new JDOM development is being done on GitHub at
There's a "jdom-1.x" branch where the JDOM 1.x line is maintained (mostly quiet), and a
"master" branch for JDOM 2 development (active).
If you happen to be using Eclipse for developement, you can run the 'eclipse' ant
target in the build.xml file, and it will set up your Eclipse JDOM project for you.