Hi, Shamal Karunarathne, if you just want an already buid with the issues fixed, check out this:
1. Chose a maven repos that keep old SNAPSHOT, example: http://snapshots.jboss.org/maven2/org/jbpm/jbpm-human-task-war/5.3.0-SNAPSHOT/
2. Chose litter newer human-task war file, for example jbpm-human-task-war-5.3.0-20120706.045301-549.war
Newer thread related to this issuse https://community.jboss.org/message/752956#752956. Sorry for reply in old thread, but this thread come up at verry top in searching result.
- Quang