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https://issues.apache.org/jira/browse/AMQ-4109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13622446#comment-13622446
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mauro rappa commented on AMQ-4109:
----------------------------------
This issue is still present in AMQ 5.8
> Negative queue counters
> -----------------------
>
> Key: AMQ-4109
> URL: https://issues.apache.org/jira/browse/AMQ-4109
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.7.0
> Reporter: Markus Hahn
>
> http://{server}:8161/admin/queues.jsp
> I get negative numbers in the "Number Of Pending Messages". Running a simple
> PTP scenario, but am purging the queue right in the middle of the action.
> Below's the experiment. 5.7.0 was run out of the box on a CentOS 6.3 with
> Java 6.
> _________________________________________________________________
> import javax.jms.Connection;
> import javax.jms.ConnectionFactory;
> import javax.jms.DeliveryMode;
> import javax.jms.Destination;
> import javax.jms.Message;
> import javax.jms.MessageConsumer;
> import javax.jms.MessageProducer;
> import javax.jms.Session;
> import javax.jms.TextMessage;
> import org.apache.activemq.ActiveMQConnection;
> import org.apache.activemq.ActiveMQConnectionFactory;
> public class PTPTest {
> //static String _url = "failover://tcp://activemqtest:61616";
> static String _url = ActiveMQConnection.DEFAULT_BROKER_URL;
>
> public void enqueue() throws Exception {
>
> Connection connection = null;
> try
> {
> System.out.println("enqueuing...");
>
> ConnectionFactory connectionFactory =
> new ActiveMQConnectionFactory(_url);
> connection = connectionFactory.createConnection();
> connection.start();
> Session s = connection.createSession(false,
> Session.CLIENT_ACKNOWLEDGE);
> //Session s = connection.createSession(false,
> Session.AUTO_ACKNOWLEDGE);
> Destination dest = s.createQueue("Q2");
> MessageProducer mp = s.createProducer(dest);
> mp.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
> for(int num = 1; num <= 100;num++) {
> String txt = "this is message #" + num;
> TextMessage tmsg = s.createTextMessage(txt);
> mp.send(tmsg);
> Thread.sleep(10);
> //System.out.printf(">>> %s\n", txt);
> }
> }
> finally {
> if (null != connection) {
> connection.close();
> }
> }
> }
>
> public void dequeue(int id) throws Exception {
>
> Connection connection = null;
>
> try {
> ConnectionFactory connectionFactory = new
> ActiveMQConnectionFactory(_url);
> connection = connectionFactory.createConnection();
> connection.start();
> Session session = connection.createSession(false,
> Session.AUTO_ACKNOWLEDGE);
> Destination destination = session.createQueue("Q2");
> MessageConsumer consumer =
> session.createConsumer(destination);
> for(;;) {
> Message msg = consumer.receive();
> TextMessage tmsg = (TextMessage)msg;
> String txt = tmsg.getText();
> System.out.printf("<<< [%d] '%s', %s, %s\n",
> id, txt,
> tmsg.getJMSMessageID(),
> tmsg.getJMSDestination());
> Thread.sleep(1000);
> }
> }
> finally {
> connection.close();
> }
> }
>
> public void exec() throws Exception {
> Thread ethrd, dthrds[];
> ethrd = new Thread() {
> public void run() {
> try {
> enqueue();
> }
> catch (Exception e) {
> e.printStackTrace();
> }
> }
> };
> ethrd.start();
> Thread.sleep(1000);
> final int D_COUNT = 4;
> dthrds = new Thread[D_COUNT];
> for (int i = 0; i < dthrds.length; i++) {
> final int ii = i;
> dthrds[i] = new Thread() {
> public void run() {
> try {
> dequeue(ii);
> }
> catch (Exception e) {
> e.printStackTrace();
> }
> }
> };
> }
> for (Thread dthrd : dthrds) {
> dthrd.start();
> }
>
> Thread.sleep(60000);
>
> ethrd.interrupt();
> ethrd.join();
> for (Thread dthrd : dthrds) {
> dthrd.interrupt();
> dthrd.join();
> }
> }
>
> public static void main(String[] args) throws Exception {
> new PTPTest().exec();
> System.out.println("\nDONE.");
> }
> }
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