Hi, I wrote a simple message grouping example to illustrate the effect of 'JMSXGroupID', but it doesn't always work as expected. All I do is create two consumers and send out 10 messages with JMSXGroupID set, and inspect that all the messages will went to only one of the consumers. But the result is random: sometimes all messages went to consumer1, sometimes consumer2 and sometimes both. I don't know what's wrong? The code : | MessageConsumer consumer1 = session.createConsumer(queue); | consumer1.setMessageListener(new SimpleMessageListener("consumer-1")); | MessageConsumer consumer2 = session.createConsumer(queue); | consumer2.setMessageListener(new SimpleMessageListener("consumer-2")); | | //Step 8. Create and send 10 text messages with group id 'Group-0' | int msgCount = 10; | TextMessage[] groupMessages = new TextMessage[msgCount]; | for (int i = 0; i < msgCount; i++) | { | groupMessages = session.createTextMessage("Group-0 message " + i); | groupMessages.setStringProperty(JBossMessage.JMSXGROUPID, "Group-0"); | producer.send(groupMessages); | System.out.println("Sent message: " + groupMessages.getText()); | } | And I added the config | | <address-settings match="jms.queue.exampleQueue"> | <distribution-policy-class>org.jboss.messaging.core.server.impl.GroupingRoundRobinDistributor</distribution-policy-class> | </address-settings> | | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4225809#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...