[jbpm-users] jbpm in ESB example

Hi, I was looking for an example of a simple jbpm process running inside an ESB (enterprise service bus) like Mule. I found this one "https://github.com/jdeoliveira/jbpm-humantask-example-3.2" but besides it deploys fine, I couldn't run it correctly. Error below. Root Exception stack trace: org.jbpm.api.JbpmException: Incoming message source is null but expected source is processRequest at org.mule.module.jbpm.MuleReceiveActivity.signal(MuleReceiveActivity.java:82) at org.jbpm.pvm.internal.model.op.Signal.perform(Signal.java:70) at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:672) + 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything) If you guys know a working example I would appreciate a lot.