[jboss-user] [JBoss Messaging] - ClassCastException using same jar file

[pasalic.zaharije]

Hi,

we are developing out project from 3 different eclipse projects. One is utils project which expose common.jar file. This file has simple interface that implements Serializable and class which implement :


public interface PublishCommand extends Serializable {
  |      // some methods 
  | }
  | 
  | public class PublishBaseCommand implements PublishCommand {
  | 
  | 	private String operationType;
  | 	
  | 	public PublishBaseCommand() {
  | 	}
  |         // some get/set methods
  | }


This will be class which will be sanded into queue1. 

Also, there is second project - Web application (on Spring) which instantiate upper class and send it to queue1. Deploy file is .war, and it contain common.jar in it's WEB-INF/lib path. Code for sending message:

           try {
  | 			jmsDistributionTemplate.send(new MessageCreator() {
  | 		         public Message createMessage(Session session) throws JMSException {
  | 		        	 	ObjectMessage oMessage = session.createObjectMessage();
  | 		        	 	oMessage.setObject(new PublishBaseCommand() );
  | 		        	 	return oMessage;
  | 		         }
  | 		    });			
  | 		}
  | 		catch(JmsException e) {
  |                    // ...
  | 		}
  | 
Third application is also Web application (also on Spring). This application contains listener:

         public void onMessage(Message message) {
  | 		if (message instanceof ObjectMessage) {
  | 			try {
  | 				ObjectMessage objectMessage = (ObjectMessage)message;
  | 				log.info("MSG   ===  " + objectMessage.getObject());
  | 				log.info("MSG HASH  ===  " + objectMessage.getObject().getClass().hashCode());
  | 				log.info("NED HASH  ===  " + PublishBaseCommand.class.hashCode());
  | 				PublishBaseCommand= (PublishBaseCommand)objectMessage.getObject(); 
  | 			}
  | 			catch(JMSException e) {
  | 				// ...
  | 			}
  | 		}
  | 	}

main problem is in thrid application - in part where we call getObject and convert it to PublishBaseCommand - we got ClassCastException:

[Thread-22] listener.SimpleMessageListenerContainer (AbstractMessageListenerContainer.java:634)     - Execution of JMS message listener failed
  | java.lang.ClassCastException: publishing.service.impl.PublishBaseCommand
  | 	at updater.service.impl.PublishListenerImpl.onMessage(PublishListenerImpl.java:33)
  | 	at org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:531)
  | 	at org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:466)
  | 	at org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:435)
  | 	at org.springframework.jms.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:407)
  | 	at org.springframework.jms.listener.SimpleMessageListenerContainer.processMessage(SimpleMessageListenerContainer.java:290)
  | 	at org.springframework.jms.listener.SimpleMessageListenerContainer$2.onMessage(SimpleMessageListenerContainer.java:266)
  | 	at org.jboss.jms.client.remoting.MessageCallbackHandler.callOnMessage(MessageCallbackHandler.java:153)
  | 	at org.jboss.jms.client.remoting.MessageCallbackHandler$ListenerRunner.run(MessageCallbackHandler.java:884)
  | 	at EDU.oswego.cs.dl.util.concurrent.QueuedExecutor$RunLoop.run(QueuedExecutor.java:89)
  | 	at java.lang.Thread.run(Unknown Source)

Also following output is traced from upper log.info:


MSG   ===  publishing.service.impl.PublishBaseCommand at 126cb1a
  | MSG HASH  ===  13712958
  | NEED HASH  ===  13628909


P.S.
I removed most of the code for readability.

Thanks,
Zaharije Pasalic





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