Hi All I Make a test with Jmeter (http://jakarta.apache.org/jmeter/) to stress my flow. I Created a Thread Group, to execute 1000 simultaneous users for start the flow. I had the follow trouble: The First users that try to started the process, received this execption: Caused by: java.lang.NullPointerException at org.drools.task.service.MinaTaskClient.addTask(MinaTaskClient.java:43) at org.drools.process.workitem.wsht.WSHumanTaskHandler.executeWorkItem(WSHumanTaskHandler.java:161) at org.drools.process.instance.impl.DefaultWorkItemManager.internalExecuteWorkItem(DefaultWorkItemManager.java:55) at org.drools.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:95) at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:112) at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:148) at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:135) at org.drools.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49) at org.drools.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41) at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:112) at org.drools.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:16) at org.drools.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:185) at org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:239) at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1708) at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:288) at br.com.dextra.droolsflow.tasks.TaskServiceBean.startProcessFlow(TaskServiceBean.java:68) After some users, the process starts normal. The problem occur only for the first users. I Believe that problem is from MinaTaskServer tha was not started correctly. (Just start, after some calls). I used to start MinaTaskServer the follow code (This code is inside a Jboss - MBean): * * *TaskService taskService = new TaskService(* * this.entityManageSessionFactory, SystemEventListenerFactory * * .getSystemEventListener());* * server = new MinaTaskServer(taskService);* * Thread thread = new Thread(server);* * thread.start();* * Thread.sleep(5000);* could anybody help me? Thanks