We are using Client API for building process definition from XML file and starting execution by using the process def: Attach is code where we are getting some hibernate error. protected void processJob(){ WorkflowProcessInstance wpi = (WorkflowProcessInstance) this.getJobDataObject(); ExecutionImpl pi = wpi.getJbpmProcessInstace(); if((pi.getState().equals(ProcessInstance.STATE_CREATED))) { pi.start(); } while (!pi.isEnded()) { if (!terminateJob) { ServerUtils.log(ServerUtils.DEBUG," Moving to next stage."); String execName = null; Iterator itr = pi.findActiveActivityNames().iterator(); while(itr.hasNext()) { execName = (String)itr.next(); ExecutionImpl execution = pi.findActiveExecutionIn(execName); if(execution.getState().equals(Execution.STATE_INACTIVE_CONCURRENT_ROOT) || execution.getState().equals(Execution.STATE_INACTIVE_JOIN) || execution.getState().equals(Execution.STATE_INACTIVE_SCOPE)) { execution = execution.getExecutions().iterator().next(); } if (execution.isActive() && !execution.isEnded()) { execution.signal(); pi = execution.getProcessInstance(); } } } else { pi.end(); } } } The highlighted line gives error when it signals on end state (Means when the workflow ends). It state hibernate error as listed below. org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [org.jbpm.pvm.internal.history.model.HistoryProcessInstanceImpl#0] at org.hibernate.impl.SessionFactoryImpl$2.handleEntityNotFound(SessionFactoryImpl.java:409) at org.hibernate.proxy.AbstractLazyInitializer.checkTargetState(AbstractLazyInitializer.java:108) at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:97) at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:140) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:190) at org.jbpm.pvm.internal.history.model.HistoryProcessInstanceImpl_$$_javassist_2.setEndTime(HistoryProcessInstanceImpl_$$_javassist_2.java) at org.jbpm.pvm.internal.history.events.ProcessInstanceEnd.process(ProcessInstanceEnd.java:41) at org.jbpm.pvm.internal.history.HistorySessionImpl.process(HistorySessionImpl.java:31) at org.jbpm.pvm.internal.history.HistoryEvent.fire(HistoryEvent.java:61) at org.jbpm.pvm.internal.model.ExecutionImpl.end(ExecutionImpl.java:353) at org.jbpm.pvm.internal.model.ExecutionImpl.end(ExecutionImpl.java:311) at org.jbpm.jpdl.internal.activity.EndActivity.execute(EndActivity.java:80) at org.jbpm.jpdl.internal.activity.EndActivity.execute(EndActivity.java:45) at org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:60) at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:637) at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:597) at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:398) at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:380) at com.santafe.soa.server.engine.workflow.WorkflowJob.processJob(WorkflowJob.java:95) at com.santafe.soa.server.engine.workflow.WorkflowJob.run(WorkflowJob.java:123) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4254323#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...