Getting Smalltalk to run on the JVM is not an easy task. There are currently two main projects trying to achieve that. One is RTalk from Mark Roos (that soon will see the open source light) and the other one is an already opens source project driven by James Ladd called Redline Smalltalk.
James now asks for support to fund the development. If you are interested in the campaign you can click here to become a Redliner.