From the Jakarta pages on Apache.org:
The Sandbox
This project also contains a workspace that is open to all Jakarta committers. It's a place to try out new ideas and prepare for inclusion into the Commons portion of the project or into another Jakarta project. Users are free to experiment with the components developed in the sandbox, but sandbox components will not necessarily be maintained, particularly in their current state.
Because of the above, I think only source code is going to be available. That is it's up to you to build it. It's not yet ready for prime-time. Hopefully someone can clear this up...