Well, thats a whole 'nother ball game right there. To make parrot/perl libraries to java, one would have to pretty much re-implement much of parrot in java or java bytecode, kinda like how Jython works. Why? The Java bytecode spec is very sparse; to support things like closers, and eval, and other things not natively in java, one heck of a lot of plumbing would be needed. (For instance, parrot has something like a bajillion opcodes, while the JVM spec has under 200).