I'm sorry if this is a common noob question, but I can't find a solution reading FAQs and the wiki. What I'm trying to do is writing a bean that should do some work when a new master gets elected. I've read that the recomended way is to use a MDB with dependency on 'jboss.ha:service=HASingletonDeployer,type=Barrier', and then do the work in the start lifecycle method. I guess I have to register a listener on the lifecycle phase or something since I don't get any calls to my start() method, but I don't know how to do that. The version I'm using is 4.2.2.GA. This is my tiny test bean: import javax.ejb.ActivationConfigProperty; | import javax.ejb.MessageDriven; | import javax.jms.Message; | import javax.jms.MessageListener; | | import org.jboss.annotation.ejb.Depends; | | @Depends("jboss.ha:service=HASingletonDeployer,type=Barrier") | @MessageDriven(name = "DummyMDBean", activationConfig = { | @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"), | @ActivationConfigProperty(propertyName = "destination", propertyValue = "queue/testQueue"), | @ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge") }) | public class DummyMDBean implements MessageListener { | | public void start() throws Exception { | System.out.println("=== START ==="); | } | | public void onMessage(Message message) { | System.out.println("message = " + message); | } | | public DummyMDBean() { | System.out.println("=== CREATE ==="); | } | } I have also tried using a Service bean without any luck. If the bean recieves a message DummyMDBean() and onMessage() gets called, but start() never gets called. The bean are stopped/started correct on all slaves and master, it's just the start() I can't get to work. Does anyone know of an alternative way to do the tasks when going from slave to master? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4258825#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...