It's not immediately obvious, but what class library does it work with? Gnu Classpath? Something else? If this doesn't have a good deal of the rest of the bu

It's not immediately obvious, but what class library does it work with? Gnu Classpath? Something else? If this doesn't have a good deal of the rest of the built in Java ecosystem, then does it have much value or usefulness? Does it have a possible advantage without a JIT, like being able to run in constrained amounts of memory?