[jboss-user] [Messaging, JMS & JBossMQ] - Bug: Injected EJB objects instantiated on every MDB call

doktora do-not-reply at jboss.com
Mon Mar 24 08:48:13 EDT 2008

It seems to me that a new instance of the EJBs injected in an MDB is created every time the MDB processes a message.

Below is the code modifications I've made to the EJB3 Trailblazer to verify this. A RecordManagerBean object is created every time the onMessage method in the CalculatorMDB is called as can be seen from the console printout of the postConstruct method.

This can have serious implications on memory consumption in a production environment.

I've added the following lines to this file in the EJB3 Trailblazer source code:


import javax.annotation.PostConstruct;
  | import javax.annotation.PreDestroy;
  | import javax.ejb.PostActivate;
  | import javax.ejb.PrePassivate;
  | import org.jboss.logging.Logger;


  private static final Logger log = Logger.getLogger(RecordManagerBean.class);
  |   @PostConstruct public void postConstruct() { log.info("++++++++++++ postConstruct  +++++++++++ "); }
  |   @PreDestroy public void preDestroy() { log.info("preDestroy **********");  }
  |   @PrePassivate public void prePassivate() { log.info("prePassivate **********"); }
  |   @PostActivate public void postActivate() { log.info("postActivate **********"); }

postConstruct is called on every MDB call, none of the other methods seem to be executed ever.

Is this a bug or am I missing something?



JBoss [Trinity] 4.2.1.GA (build: SVNTag=JBoss_4_2_1_GA date=200707131605)
Java version: 1.5.0_13,Apple Computer, Inc.
OS-System: Mac OS X 10.4.11,i386

JBoss is started with -c all and the EJB3Trail.jar is put in all/farm/

View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4138516#4138516

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4138516

More information about the jboss-user mailing list