Vijay Bhakta [https://community.jboss.org/people/vjbhakta] created the discussion "Using JMS Topic with Jboss Messaging 1.4.2.GA-SP1 seems unreliable." To view the discussion, visit: https://community.jboss.org/message/745434#745434 -------------------------------------------------------------- Hi, Does anyone have experienced this and has a suggestion? I am using JBoss 4.2.3.GA with JBoss-Messaging 1.4.2.GA-SP1 In my real application, I have now and then observed a JMS Message not received at one or the other client. To reproduce and analyze the same, I have made simple program closer to my scenario and focus on JMS. Let me brief you the scenario: 1. A stateless Bean deployed with a method that generates 100 JMS messages to JMS Topic. Its more frequent when message size is ~1k. 2. An external client 'API-Caller' that invokes the bean and calls the method, once every second for duration of 1-min. I launch typically more than 40 such clients. 3. I stamped each Message with EventNumber, an incremental number to uniquely identify it. 4. A Client 'Event-Listener' which subscribes to the JMS Topic and waits/receives messages. I launch 4 instances of this client on two different systems with 2 on each. Each 'Event-Listener' notes that the EventNumber if JMS Message skips a number. I am running JBoss on Windows7 64-bit and Debian-Linux(Squeeze) And Clients 'API-Caller' and 'Event-Listener' on WindowsXP machine. Running this test, I see that some JMS Messages are not received by one or the other client. Also, a Message received by one client is not recieved by other running on same system. A code outline of my stateless Bean :--------------------------------------> public class MyBean     implements IMyBean {     private static synchronized int getEventNumber ()     {         return ++mEventNumber;     }     public int produce100Messages (int PayloadInBytes)     {         Connection connection = null;         Session session = null;         MessageProducer publisher = null;         Integer num = 0;         String payload = "";         for(int i=0; i<PayloadInBytes; i++)         {             payload += "Z";                    }                 try         {             InitialContext ic = new InitialContext();             ConnectionFactory cf = (ConnectionFactory) ic.lookup("java:/JmsXA");             Topic topic = (Topic) ic.lookup("topic/MyTopic");             connection = cf.createConnection();             session = connection.createSession(true, Session.SESSION_TRANSACTED);             publisher = session.createProducer(topic);             connection.start();             num = getEventNumber();             num = num * 100;             for (int i = 0; i < 100; i++)             {                 Message msg = session.createTextMessage(num.toString() + ";" + payload);                                 publisher.send(msg);                 num++;             }             num--;         }         catch (Exception anException)         {             anException.printStackTrace();         }         finally         {                ...                //Close producer, session, and connection                     }         return num;     } } The code outline at subscriber end :-------------------------------------------> public class MYMsgListener     implements MessageListener {    ...    public void onMessage (Message anArg0)     {      ...      ...             String[] arrStr = ((TextMessage) anArg0).getText().split(";");                        Integer eventNumber = Integer.parseInt(arrStr[0]);             mEventQ.add(eventNumber);      ...     }     ... -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/745434#745434] Start a new discussion in JBoss Messaging at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]