Thanks again, Huisheng. This new machine is a fresh set-up (jboss, jbpm, jwdsp, ant, everything), installed two days back. Even the DB server has got a fresh mysql installed, and jbpm DB schema is newly created. And all the processes are getting deployed for the first time and hitting the problem.
But, I'll take your suggestion and clean up the env again, and retry. Will let you know the results in another 15-20mins.