Compose will work with the current Java build so don't worry about trying to track down and install an obsolete version of Java, basically it should work with any Java build you might have installed.

There are a couple of tutorials for using Compose over on RuntimeDNA and I have one that shows a workflow for using Blender to create FBM's.

Documentation on Compose is a little thin but if you check out the Compose-docs.txt file in the download you'll realize it does a lot more than my tutorial or the one's on RDNA cover.

Anyone that is interested in the Compose/Blender tutorial I wrote PM me and I'll send you the link.(The Compose section of the tutorial works for any 3D application not just Blender.)