Philosophical Issues of JPL & perljvm/Jasmin

Can someone please help me understand the aims of JPL versus those of
perljvm/Jasmin?  This really is a naive question on my part - just trying to
understand where the two efforts are coming from, headed to, and whether
they are anticipated to intersect or possibly even combine at some date in
the future.  I've poked around on the perl5-porters archives, various
READMEs, etc. but still feel somewhat unclear about who is trying to
accomplish what via which methods when. 

thanks in advance,

rick