Forgot to mention that I also restarted message broker before start durable
subscriber again.
eaglepointe wrote:
>
> Ok, here is what I did,
>
> 1) start message broker
> 2) start a durable subscriber which subscribes "topictest.messages" as the
> attached code
> 3) start publisher, which sends some messages to "topictest.messages" in
> 'persistent' mode, and the subscriber receives the messages
> 4) stop the subscriber and publisher
> 5) start publisher again, which sends some messages to
> "topictest.messages"
> 6) stop publisher
> 7) start subscriber again, according to my understanding of durable
> subscription, I'd expect subscriber receives the messages sent by
> publisher, but I got the exceptions instead
>
> Following is a more complete version of subscriber code, which is really
> the sample code comes with ActiveMQ installation, except for the durable
> subscription.
>
> The same code works fine, meaning no exceptions, if I don't use durable
> subscription.
> It seems that durable subscription requires some context in message broker
> which somehow got lost.
>
>
> --------------------------------------------------------------------------------------------
>
>
> public class TopicListener implements MessageListener {
>
> private Connection connection;
> private MessageProducer producer;
> private Session session;
> private int count;
> private long start;
> private Topic topic;
> private Topic control;
> //private TopicSubscriber consumer;
>
> private String url = "tcp://192.168.30.60:61616";
>
> public static void main(String[] argv) throws Exception {
> TopicListener l = new TopicListener();
> String[] unknown = CommandLineSupport.setOptions(l, argv);
> if (unknown.length > 0) {
> System.out.println("Unknown options: " +
> Arrays.toString(unknown));
> System.exit(-1);
> }
> l.run();
> }
>
> public void run() throws JMSException {
> ActiveMQConnectionFactory factory = new
> ActiveMQConnectionFactory(url);
> connection = factory.createConnection();
> connection.setClientID("myClient");
> session = connection.createSession(false,
> Session.AUTO_ACKNOWLEDGE);
> topic = session.createTopic("topictest.messages");
> control = session.createTopic("topictest.control");
>
> TopicSubscriber consumer =
> session.createDurableSubscriber(topic,"myDurable1");
> //MessageConsumer consumer = session.createConsumer(topic);
> consumer.setMessageListener(this);
>
> producer = session.createProducer(control);
>
> System.out.println("Waiting for messages...");
> connection.start();
> }
> ---------------------------------------------------------------------------------
>
> your grateful,
> -Jeff
>
>
>
> Dave Stanley wrote:
>>
>> Your not running this from within a thread by any chance? I don't
>> believe connection.start() is going to block, so try and create the
>> connection outside the thread and pass it in by reference to the thread
>> instance.
>>
>> HTH
>> /Dave
>>
>>
>> On Thu, Jun 12, 2008 at 10:30 PM, eaglepointe <[EMAIL PROTECTED]>
>> wrote:
>>
>>>
>>> Hi,
>>>
>>> I'm new to ActiveMQ and having problem with durable subscription,
>>> following
>>> code based on example code,
>>>
>>> ===================================================================
>>> public void run() throws JMSException {
>>> ActiveMQConnectionFactory factory = new
>>> ActiveMQConnectionFactory(url);
>>> connection = factory.createConnection();
>>> connection.setClientID("myClient");
>>> session = connection.createSession(false,
>>> Session.AUTO_ACKNOWLEDGE);
>>> topic = session.createTopic("topictest.messages");
>>> control = session.createTopic("topictest.control");
>>>
>>> TopicSubscriber consumer =
>>> session.createDurableSubscriber(topic,"myDurable1");
>>> //MessageConsumer consumer = session.createConsumer(topic);
>>> consumer.setMessageListener(this);
>>>
>>> producer = session.createProducer(control);
>>>
>>> System.out.println("Waiting for messages...");
>>> connection.start();
>>> }
>>> =================================================================
>>>
>>> is causing exceptions on broker side and client side, below are the
>>> exceptions
>>>
>>> broker side:
>>>
>>> ERROR Service - Async error occurred:
>>> java.lang.NullPointerException
>>> java.lang.NullPointerException
>>> at
>>>
>>> org.apache.activemq.broker.TransportConnection.processAddProducer(TransportConnection.java:479)
>>> at
>>> org.apache.activemq.command.ProducerInfo.visit(ProducerInfo.java:105)
>>> at
>>>
>>> org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:292)
>>> at
>>>
>>> org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:180)
>>> at
>>>
>>> org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:68)
>>> at
>>>
>>> org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:143)
>>> at
>>>
>>> org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:206)
>>> at
>>>
>>> org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:84)
>>> at
>>> org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:196)
>>> at
>>> org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:183)
>>> at java.lang.Thread.run(Thread.java:619)
>>>
>>> client side:
>>>
>>> Exception in thread "ActiveMQ Session Task"
>>> java.util.concurrent.RejectedExecutionException
>>> at
>>>
>>> java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(Unknown
>>> Source)
>>> at java.util.concurrent.ThreadPoolExecutor.reject(Unknown Source)
>>> at java.util.concurrent.ThreadPoolExecutor.execute(Unknown
>>> Source)
>>> at
>>>
>>> org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:144)
>>> at
>>> org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43)
>>> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
>>> Source)
>>> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
>>> Source)
>>> at java.lang.Thread.run(Unknown Source)
>>>
>>>
>>> Any idea? Thanks in advance!
>>>
>>> --
>>> View this message in context:
>>> http://www.nabble.com/having-problem-with-durable-subscription-tp17813954p17813954.html
>>> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>>>
>>>
>>
>>
>
>
--
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