Description of problem:

I have BPMS 6.0.0.ER3 set with DB2.

When any process instance proceed to a human task, the task server will throw an exception that it's not possible to create a task.

I will attach the server.log but I think this part is most important.

08:57:23,676 WARN [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (http-localhost/127.0.0.1:8080-12) SQL Error: -1585, SQLState: 54048
08:57:23,676 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (http-localhost/127.0.0.1:8080-12) DB2 SQL Error: SQLCODE=-1585, SQLSTATE=54048, SQLERRMC=null, DRIVER=4.14.122
08:57:23,684 ERROR [org.jbpm.services.task.wih.LocalHTWorkItemHandler] (http-localhost/127.0.0.1:8080-12) Mon Sep 23 08:57:23 EDT 2013: Error when creating task on task server for work item id 1. Error reported by task server: Operation failed: java.lang.RuntimeException: Operation failed
at org.jbpm.shared.services.impl.JbpmServicesPersistenceManagerImpl.persist(JbpmServicesPersistenceManagerImpl.java:208) [jbpm-shared-services-6.0.0-redhat-3.jar:6.0.0-redhat-3]

On the client side I receive different exception but it's only a consequence:

org.jbpm.workflow.instance.WorkflowRuntimeException: [org.jboss.qa.bpms.HumanTask:122 - :1] – No active JTA transaction on joinTransaction call
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:161)

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