Hi,
Just to make it easy for you, I cut out the error part in the log as follows:
16:23:53,053 ERROR [stderr] (Thread-20) javax.persistence.NoResultException: No entity found for query
16:23:53,053 ERROR [stderr] (Thread-20) at org.hibernate.ejb.QueryImpl.getSingleResult(QueryImpl.java:104)
16:23:53,054 ERROR [stderr] (Thread-20) at org.jbpm.task.service.TaskServiceSession.getTaskByWorkItemId(TaskServiceSession.java:644)
16:23:53,054 ERROR [stderr] (Thread-20) at org.jbpm.task.service.TaskServerHandler.messageReceived(TaskServerHandler.java:258)
16:23:53,054 ERROR [stderr] (Thread-20) at org.jbpm.task.service.hornetq.HornetQTaskServerHandler.messageReceived(HornetQTaskServerHandler.java:44)
16:23:53,054 ERROR [stderr] (Thread-20) at org.jbpm.task.service.hornetq.BaseHornetQTaskServer.run(BaseHornetQTaskServer.java:85)
16:23:53,055 ERROR [stderr] (Thread-20) at java.lang.Thread.run(Thread.java:722)
16:23:53,067 ERROR [stderr] (Thread-46) Exception in thread "Thread-46" java.lang.RuntimeException: Client Exception with class class org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1 using port 5445
16:23:53,067 ERROR [stderr] (Thread-46) at org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1.run(HornetQTaskClientConnector.java:134)
16:23:53,067 ERROR [stderr] (Thread-46) at java.lang.Thread.run(Thread.java:722)
16:23:53,068 ERROR [stderr] (Thread-46) Caused by: java.lang.ClassCastException: org.jbpm.process.workitem.wsht.CommandBasedWSHumanTaskHandler$AbortTaskResponseHandler cannot be cast to org.jbpm.task.service.TaskClientHandler$TaskSummaryResponseHandler
16:23:53,068 ERROR [stderr] (Thread-46) at org.jbpm.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:171)
16:23:53,068 ERROR [stderr] (Thread-46) at org.jbpm.task.service.hornetq.HornetQTaskClientHandler.messageReceived(HornetQTaskClientHandler.java:56)
16:23:53,068 ERROR [stderr] (Thread-46) at org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1.run(HornetQTaskClientConnector.java:120)
16:23:53,069 ERROR [stderr] (Thread-46) ... 1 more
waiting for your response...
Cheers