[ http://jira.jboss.com/jira/browse/JBMQ-4?page=comments#action_12310759 ]
Scott M Stark commented on JBMQ-4:
----------------------------------
Another user has seen a similar deadlock using 1.4.2_02-b03. Two full thread
dump outputs are attached, and the interesting non-runnable threads are:
"Thread-365" daemon prio=5 tid=0x00ab6d00 nid=0x1028 waiting for monitor entry
[4980f000..4980fdb0]
at
org.jboss.mq.server.MessageCache.validateSoftReferenceDepth(MessageCache.java:327)
- waiting to lock <0x100e6d30> (a org.jboss.mq.server.MessageReference)
at org.jboss.mq.server.MessageCache.addInternal(MessageCache.java:142)
at org.jboss.mq.server.MessageCache.add(MessageCache.java:112)
at org.jboss.mq.server.JMSTopic.addMessage(JMSTopic.java:357)
at
org.jboss.mq.server.JMSDestinationManager.addMessage(JMSDestinationManager.java:402)
at
org.jboss.mq.server.JMSDestinationManager.addMessage(JMSDestinationManager.java:378)
at
org.jboss.mq.server.JMSServerInterceptorSupport.addMessage(JMSServerInterceptorSupport.java:136)
at
org.jboss.mq.security.ServerSecurityInterceptor.addMessage(ServerSecurityInterceptor.java:153)
at
org.jboss.mq.server.TracingInterceptor.addMessage(TracingInterceptor.java:279)
at
org.jboss.mq.server.JMSServerInvoker.addMessage(JMSServerInvoker.java:136)
at
org.jboss.mq.il.uil2.ServerSocketManagerHandler.handleMsg(ServerSocketManagerHandler.java:86)
at
org.jboss.mq.il.uil2.SocketManager$ReadTask.handleMsg(SocketManager.java:356)
at org.jboss.mq.il.uil2.msgs.BaseMsg.run(BaseMsg.java:377)
at
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748)
at java.lang.Thread.run(Thread.java:534)
"Thread-219" daemon prio=5 tid=0x41cd9008 nid=0xdf8 runnable
[4920f000..4920fdb0]
at
org.jboss.mq.server.MessageCache.validateSoftReferenceDepth(MessageCache.java:327)
- waiting to lock <0x100e6d30> (a org.jboss.mq.server.MessageReference)
at org.jboss.mq.server.MessageCache.addInternal(MessageCache.java:142)
at org.jboss.mq.server.MessageCache.add(MessageCache.java:112)
at org.jboss.mq.server.JMSTopic.addMessage(JMSTopic.java:357)
at
org.jboss.mq.server.JMSDestinationManager.addMessage(JMSDestinationManager.java:402)
at
org.jboss.mq.server.JMSDestinationManager.addMessage(JMSDestinationManager.java:378)
at
org.jboss.mq.server.JMSServerInterceptorSupport.addMessage(JMSServerInterceptorSupport.java:136)
at
org.jboss.mq.security.ServerSecurityInterceptor.addMessage(ServerSecurityInterceptor.java:153)
at
org.jboss.mq.server.TracingInterceptor.addMessage(TracingInterceptor.java:279)
at
org.jboss.mq.server.JMSServerInvoker.addMessage(JMSServerInvoker.java:136)
at
org.jboss.mq.il.uil2.ServerSocketManagerHandler.handleMsg(ServerSocketManagerHandler.java:86)
at
org.jboss.mq.il.uil2.SocketManager$ReadTask.handleMsg(SocketManager.java:356)
at org.jboss.mq.il.uil2.msgs.BaseMsg.run(BaseMsg.java:377)
at
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748)
at java.lang.Thread.run(Thread.java:534)
However, no thread is seen to hold the 0x100e6d30 monitor so the actual
deadlock is not apparent from the thread dump.
> Bug in JBoss MQ
> ---------------
>
> Key: JBMQ-4
> URL: http://jira.jboss.com/jira/browse/JBMQ-4
> Project: JBoss MQ
> Type: Bug
> Versions: JBossAS-3.2.5
> Environment: OS - SunOS, 5.8, Java Version - 1.4.2, VM - Java Hotspot
> Reporter: Kalyan
> Assignee: Adrian Brock
> Priority: Critical
> Attachments: threaddump.txt
>
>
> Hi,
> We were running a loadtest on a single instance of JBoss. The following
> thread on JBossMQ forum details about the test that's been conducted:
> http://www.jboss.org/index.html?module=bb&op=viewtopic&t=57189
> The server has come to unusable state in less than 30 mins.
> We have identified that there is a deadlock on MessageCache's LRUCache from
> the thread dump. We have found several instances of the below dump.
> "Thread-11056" daemon prio=5 tid=0x014d8ff0 nid=0x3d17 waiting for monitor
> entry [5e801000..5e8019c0]
> at
> org.jboss.mq.server.MessageCache.validateSoftReferenceDepth(MessageCache.java:327)
> - waiting to lock <0xeddc9268> (a
> org.jboss.mq.server.MessageReference)
> at org.jboss.mq.server.MessageCache.addInternal(MessageCache.java:142)
> at org.jboss.mq.server.MessageCache.add(MessageCache.java:112)
> at org.jboss.mq.server.JMSQueue.addMessage(JMSQueue.java:130)
> at
> org.jboss.mq.server.JMSDestinationManager.addMessage(JMSDestinationManager.java:402)
> at
> org.jboss.mq.server.JMSDestinationManager.addMessage(JMSDestinationManager.java:378)
> at
> org.jboss.mq.server.JMSServerInvoker.addMessage(JMSServerInvoker.java:136)
> at
> org.jboss.mq.il.uil2.ServerSocketManagerHandler.handleMsg(ServerSocketManagerHandler.java:86)
> at
> org.jboss.mq.il.uil2.SocketManager$ReadTask.handleMsg(SocketManager.java:356)
> at org.jboss.mq.il.uil2.msgs.BaseMsg.run(BaseMsg.java:377)
> at
> EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748)
> at java.lang.Thread.run(Thread.java:534)
> There were few instances of the below dump.
> "Thread-10996" daemon prio=5 tid=0x01145a08 nid=0x3cc8 waiting for monitor
> entry [60201000..602019c0]
> at
> org.jboss.mq.server.MessageCache.validateSoftReferenceDepth(MessageCache.java:272)
> - waiting to lock <0xebdd8c78> (a
> org.jboss.mq.server.MessageCache$LRUCache)
> at org.jboss.mq.server.MessageCache.addInternal(MessageCache.java:142)
> at org.jboss.mq.server.MessageCache.add(MessageCache.java:112)
> at org.jboss.mq.server.JMSQueue.addMessage(JMSQueue.java:130)
> at
> org.jboss.mq.server.JMSDestinationManager.addMessage(JMSDestinationManager.java:402)
> at
> org.jboss.mq.server.JMSDestinationManager.addMessage(JMSDestinationManager.java:378)
> at
> org.jboss.mq.server.JMSServerInvoker.addMessage(JMSServerInvoker.java:136)
> at
> org.jboss.mq.il.uil2.ServerSocketManagerHandler.handleMsg(ServerSocketManagerHandler.java:86)
> at
> org.jboss.mq.il.uil2.SocketManager$ReadTask.handleMsg(SocketManager.java:356)
> at org.jboss.mq.il.uil2.msgs.BaseMsg.run(BaseMsg.java:377)
> at
> EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:748)
> at java.lang.Thread.run(Thread.java:534)
> We have found that the deadlock is happening in the method
> validateSoftReferenceDepth of MessageCache and have commented the calls to
> that method and ran the server again with the same configuration. This time
> the server was running with a load of 225 clients, each hitting the server
> every 100 seconds, for 2.5 days. There were no problems after the code was
> commented out. So, looks like there is a problem with the implementation of
> this method. Though I couldn't get you thread dump right now, I remember
> seeing a lock on the ConcurrentHashTable (or some similar class) of
> EDU.oswego package. That was holding the lock and many threads are trying to
> put in messages into the MessageCache, and were not able to get the lock.
> We are using Null Persistence Manager as suggested in one of the wiki pages.
> We are not sure why is the Soft Referencing and Hard Referencing happening
> when a Null Persistence is used? All we wanted to extract from JMS is
> asynchronous behaviour, where there is no requirement for "Store and
> Forward". The server can dispatch the result and then forget about it. If a
> client is alive, it will take it, or else the message is gone. There is no
> problem with this kind of approach for our functionality.
> The code that's used is as below: (This is stripped down version of our
> actual test code. This is the exact funcationality that we are testing).
> EJB & JMS Code:- (Server Side)
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@ ServerHome.java @@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> package test.ejb.server;
> import java.rmi.RemoteException;
> import javax.ejb.CreateException;
> import javax.ejb.EJBHome;
> public interface ServerHome extends EJBHome
> {
> public Server create() throws RemoteException, CreateException;
> }
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@ Server.java @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> package test.ejb.server;
> import java.rmi.RemoteException;
> import javax.ejb.EJBObject;
> public interface Server extends EJBObject
> {
> public String getInformation(String correlationId, String queueName)
> throws RemoteException;
> }
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@ ServerBean.java @@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> package test.ejb.server;
> import java.rmi.RemoteException;
> import javax.ejb.EJBException;
> import javax.ejb.SessionBean;
> import javax.ejb.SessionContext;
> public class ServerBean implements SessionBean
> {
> private SessionContext myCtx = null;
> private QueueDispatcher myQD = null;
>
> public void ejbCreate()
> {
> System.out.println("Creating ejb.....");
> }
>
> public String getInformation(String correlationId, String queueName)
> {
> myQD = new QueueDispatcher(correlationId,queueName);
> System.out.println("Returning information...");
> return "SUCCESS";
> }
>
> public void ejbActivate() throws EJBException, RemoteException
> {
> }
> public void ejbPassivate() throws EJBException, RemoteException
> {
> }
> public void ejbRemove() throws EJBException, RemoteException
> {
> }
> public void setSessionContext(SessionContext ctx) throws EJBException,
> RemoteException
> {
> System.out.println("Setting session context "+ctx);
> myCtx = ctx;
> }
> }
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@ QueueDispatcher.java @@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> package test.ejb.server;
> import java.util.Hashtable;
> import javax.jms.Queue;
> import javax.jms.QueueConnection;
> import javax.jms.QueueConnectionFactory;
> import javax.jms.QueueSender;
> import javax.jms.QueueSession;
> import javax.jms.Session;
> import javax.jms.TextMessage;
> import javax.naming.Context;
> import javax.naming.InitialContext;
> public class QueueDispatcher
> {
> private final String myQueueName ;
> private final String myCorrelationId;
> private Context myInitialContext = null;
>
> private Hashtable myQueueTable = new Hashtable();
>
> public QueueDispatcher(final String correlationId, final String qName)
> {
> myQueueName = qName;
> myCorrelationId = correlationId;
> try
> {
> dispatchResult();
> }
> catch(Exception e)
> {
> System.out.println("Exception while dispatching the result....");
> e.printStackTrace();
> }
> }
>
> private void dispatchResult() throws Exception
> {
> System.out.println("Dispatching the result....");
>
> long size = 65000; // default value
> Object sizeObj =
> getInitialContext().lookup("java:comp/env/loadtest/replysize");
> if(sizeObj != null)
> {
> size = new Long(sizeObj.toString()).longValue();
> }
>
> char[] emptyString = new char[(int)size];
> StringBuffer buffer = new StringBuffer();
> buffer.append(myCorrelationId);
> buffer.append("_GS_");
> buffer.append(emptyString);
>
> writeMessage(myQueueName,buffer.toString());
> }
>
> private Context getInitialContext() throws Exception
> {
> if(myInitialContext == null)
> {
> myInitialContext = new InitialContext();
> }
> return myInitialContext;
> }
>
> private void writeMessage(String queueName, String message) throws
> Exception
> {
> TextMessage tm =
> getQueueInfo(queueName).getQueueSession().createTextMessage(message);
> getQueueSender(queueName).send(tm);
> }
>
> private QueueInfoHolder getQueueInfo(String queueName)
> {
> return (QueueInfoHolder)myQueueTable.get(queueName);
> }
>
> private QueueSender getQueueSender(String queueName) throws Exception
> {
> QueueInfoHolder holder = getQueueInfo(queueName);
>
> if(holder != null)
> {
> return holder.getQueueSender();
> }
>
> holder = new QueueInfoHolder();
>
> Queue queue = (Queue)getInitialContext().lookup(queueName);
> String connFactoryName = "javax.jms.QueueConnectionFactory"; // conn
> factory name
>
> QueueConnectionFactory factory =
> (QueueConnectionFactory)getInitialContext().lookup(connFactoryName);
> QueueConnection connection =
> (QueueConnection)factory.createQueueConnection();
> QueueSession session =
> (QueueSession)connection.createQueueSession(false,Session.AUTO_ACKNOWLEDGE);
> QueueSender sender = (QueueSender)session.createSender(queue);
> holder.setQueueSender(sender);
> myQueueTable.put(queueName,holder);
>
> return sender;
> }
> }
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@ QueueInfoHolder.java @@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> package test.ejb.server;
> import javax.jms.QueueSender;
> import javax.jms.QueueSession;
> class QueueInfoHolder
> {
> private QueueSender mySender;
> private QueueSession mySession;
> QueueInfoHolder()
> {
> mySender = null;
> mySession = null;
> }
> public void setQueueSender(QueueSender sender)
> {
> mySender = sender;
> }
>
> public QueueSender getQueueSender()
> {
> return mySender;
> }
>
> public void setQueueSession(QueueSession session)
> {
> mySession = session;
> }
>
> public QueueSession getQueueSession()
> {
> return mySession;
> }
> }
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@ ejb-jar.xml @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> <?xml version="1.0"?>
> <!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans
> 1.1//EN' 'http://java.sun.com/j2ee/dtds/ejb-jar_1_1.dtd'>
> <ejb-jar>
> <enterprise-beans>
> <session>
> <ejb-name>server.Server</ejb-name>
> <home>test.jms.server.ServerHome</home>
> <remote>test.jms.server.Server</remote>
> <ejb-class>test.jms.server.ServerBean</ejb-class>
> <session-type>Stateless</session-type>
> <transaction-type>Container</transaction-type>
> <env-entry>
>
> <env-entry-name>loadtest/replysize</env-entry-name>
> <env-entry-type>java.lang.Long</env-entry-type>
> <env-entry-value>100000</env-entry-value>
> </env-entry>
> <env-entry>
>
> <env-entry-name>loadtest/jms/connectionfactory</env-entry-name>
>
> <env-entry-type>java.lang.String</env-entry-type>
>
> <env-entry-value>javax.jms.QueueConnectionFactory</env-entry-value>
> </env-entry>
> </session>
> </enterprise-beans>
> </ejb-jar>
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> Client Code: -
> Run this client after setting the system property: run.sleep.time to 10000
> (10 secs) or appropriate
> This property is used to hit the server after every 10 seconds.
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@ EJBClient.java @@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> package test.ejb.client;
> import java.rmi.RMISecurityManager;
> import java.util.Properties;
> import javax.naming.Context;
> import javax.naming.InitialContext;
> import javax.rmi.PortableRemoteObject;
> import test.ejb.server.Server;
> import test.ejb.server.ServerHome;
> public class EJBClient
> {
> private final String SERVER_URL = "jnp://localhost:1099";
> private String myQueueName = null;
> private static int myCounter = 0;
>
> public EJBClient() throws Exception
> {
> int count = 0;
> Thread t = Thread.currentThread();
> while (true)
> {
> run();
> count++;
> try
> {
> long sleepTime = Long.getLong("run.sleep.time", 5000)
> .longValue();
> Thread.sleep(sleepTime);
> } catch (Exception e)
> {
> e.printStackTrace();
> }
> }
>
> }
>
> private void run() throws Exception
> {
> Properties p = System.getProperties();
> p.put(Context.PROVIDER_URL,SERVER_URL);
>
> p.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
> Context context = new InitialContext(p);
>
> Object obj = context.lookup("ejbtest.Server");
>
> ServerHome home =
> (ServerHome)PortableRemoteObject.narrow(obj,ServerHome.class);
> Server server = home.create();
> String queueName =
> DefaultJMSQueueDispatcher.getInstance().findOrCreateQueue(SERVER_URL);
> String result =
> server.getInformation(queueName,generateCorrelationId());
> }
>
> public synchronized String generateCorrelationId()
> {
> return (myCounter++) + "_" + myQueueName;
> }
>
> public static void main(String[] args)
> {
> System.setSecurityManager(new RMISecurityManager());
> try
> {
> new EJBClient();
> }
> catch (Exception e)
> {
> e.printStackTrace();
> }
> }
> }
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@ DefaultJMSQueueDispatcher.java @@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> package test.ejb.client;
> import java.util.Hashtable;
> import java.util.Properties;
> import javax.jms.*;
> import javax.naming.*;
> public class DefaultJMSQueueDispatcher implements MessageListener
> {
> private Hashtable myQueueTable;
> private static DefaultJMSQueueDispatcher ourQueueDispatcher = null;
> public static final String FACTORY_URL_PKG
> ="org.jboss.naming:org.jnp.interfaces";
> public static final String FACTORY_URL_PROPERTY
> ="java.naming.factory.url.pkgs";
> private DefaultJMSQueueDispatcher()
> {
> }
> public static synchronized DefaultJMSQueueDispatcher getInstance()
> {
> if (ourQueueDispatcher == null)
> {
> ourQueueDispatcher = new DefaultJMSQueueDispatcher();
> }
> return ourQueueDispatcher;
> }
> public void onMessage(Message msg)
> {
> try
> {
> String message = ((TextMessage) msg).getText();
> String corrId = message.substring(0, message.indexOf("_GS_"));
> System.out.println("Received Message for Correlation Id: " +
> corrId+ "\n");
> }
> catch (Exception exp)
> {
> exp.printStackTrace();
> }
> }
> private MyQueueConnectionHolder createQueue(String serverUrl)
> throws NamingException, JMSException
> {
> Context context = getInitialContext(serverUrl);
> QueueConnectionFactory qconFactory = (QueueConnectionFactory) context
> .lookup("javax.jms.QueueConnectionFactory");
> QueueConnection connection = qconFactory.createQueueConnection();
> connection.setExceptionListener(new JMSConnectionExceptionListener(
> serverUrl));
> QueueSession session = connection.createQueueSession(false,
> Session.AUTO_ACKNOWLEDGE);
> Queue queue = (Queue) session.createTemporaryQueue();
> connection.start();
> QueueReceiver receiver = session.createReceiver(queue);
> receiver.setMessageListener(new MyMessageListener());
> try
> {
> context.rebind(queue.getQueueName(), queue);
> } catch (NamingException nmexp)
> {
> nmexp.printStackTrace();
> }
> MyQueueConnectionHolder holder = new MyQueueConnectionHolder(session,
> receiver, queue, connection);
> myQueueTable.put(serverUrl, holder);
> return holder;
> }
> public synchronized String findOrCreateQueue(String serverUrl)
> throws NamingException, JMSException
> {
> Object queue;
> if (myQueueTable == null)
> {
> myQueueTable = new Hashtable();
> queue = createQueue(serverUrl);
> } else
> {
> queue = myQueueTable.get(serverUrl);
> if (queue == null)
> {
> queue = createQueue(serverUrl);
> }
> }
> return ((MyQueueConnectionHolder) queue).myQueue.getQueueName();
> }
> public void close(String serverUrl) throws JMSException
> {
> System.out.println("JMSDispatcher::close Closing Queue " + serverUrl);
> Object queue = myQueueTable.get(serverUrl);
> myQueueTable.remove(serverUrl);
> if (queue != null)
> {
> ((MyQueueConnectionHolder) queue).myReciever.close();
> ((MyQueueConnectionHolder) queue).mySession.close();
> ((MyQueueConnectionHolder) queue).myConnection.close();
> }
> }
> private Context getInitialContext(String url) throws NamingException
> {
> Properties p = System.getProperties();
> p.put(Context.PROVIDER_URL,"jnp://localhost:1099");
>
> p.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
> p.put(FACTORY_URL_PROPERTY, FACTORY_URL_PKG);
> return new InitialContext(p);
> }
> private class MyQueueConnectionHolder
> {
> public Queue myQueue;
> public Connection myConnection;
> public Session mySession;
> public QueueReceiver myReciever;
> public MyQueueConnectionHolder(Session session, QueueReceiver
> reciever,
> Queue queue, Connection connection)
> {
> mySession = session;
> myReciever = reciever;
> myQueue = queue;
> myConnection = connection;
> }
> }
> private class JMSConnectionExceptionListener implements ExceptionListener
> {
> private String myUrl;
> public JMSConnectionExceptionListener(String serverUrl)
> {
> myUrl = serverUrl;
> }
> public void onException(JMSException exp)
> {
> try
> {
> close(myUrl);
> } catch (JMSException jmsexp)
> {
> exp.printStackTrace();
> }
> }
> }
> }
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> @@@@@@@@ MyMessageListener.java @@@@@@@@@@@@@@@@@@@@
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> package test.ejb.client;
> import javax.jms.*;
> public class MyMessageListener implements MessageListener
> {
> public void onMessage(Message msg)
> {
> try
> {
> String message = ((TextMessage)msg).getText();
> long endTime = System.currentTimeMillis();
> String corrId = message.substring(0,message.indexOf("_GS_"));
> System.out.println("Received Message for Correlation Id: " +
> corrId);
> }
> catch (JMSException e)
> {
> e.printStackTrace();
> }
> }
> }
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