Java Virtual Machine on NS7520

I’m totally new to embedded systems coming from a CS/Java background. Is there a Java Virtual Machine for the NS7520 available? I’ve found ten or so Virtual Machines that claim to work on the ARM7, however my application requires the HDLC features of the NS7520 which I haven’t found on any readily available ARM7 chip. How much work is it to port one of these other JVMs to the NS7520? Thanks for any input.