Add some random when JobExecutorThread acquiring job ----------------------------------------------------- Key: JBPM-1454 URL: https://jira.jboss.org/jira/browse/JBPM-1454 Project: JBoss jBPM Issue Type: Feature Request Security Level: Public(Everyone can see) Components: Core Engine Affects Versions: jBPM 3.2.3 Reporter: Pavel Kadlec The method JobSession.getFirstAcquirableJob always acquires first available job. When using multithreaded JobExecutor, there is bigger probability that the JobExecutor threads takes the same job that will cause StaleObjectState exception. I propose to add some random to the method JobSession.getFirstAcquirable. Proposal solution public Job getFirstAcquirableJob(String lockOwner) { Job job = null; try { Query query = session.getNamedQuery("JobSession.getFirstAcquirableJob"); query.setString("lockOwner", lockOwner); query.setTimestamp("now", new Date()); query.setMaxResults(10); // TODO Magic number List results = query.list(); int numResults = results.size(); if (numResults > 0) { int whichResult = (int)(Thread.currentThread().getId() % numResults); job = (Job)results.get(whichResult); } } catch (Exception e) { log.error(e); throw new JbpmException("couldn't get acquirable jobs", e); } return job; }