Yes you should check that the HornetQ version and the Netty versions are the correct ones.
You can do mvn dependency:tree on your project to see which are the requried versions and then make sure that inside the AS those versions are in place.
I have already checked them. The hornetq jar included in the jbpm-human-task-war war file in the community installer is 2.2.10. That's also the version our application shows as a dependency with jbpm5.3 & drools5.4 included in the pom. AS7.0.2 has 2.2.7 as the hornetq module. AS7.1.1 has 2.2.13 as the hornetq module. So are you saying that each version of jboss deployed into needs to be changed so the hornetq module matches the one in the human-task war file?