Peter Sedláček thinks this is interesting: Figure 4.8. The MDB lifecycle has three states: doesn’t exist, idle, and busy. There are only two lifecycle callbacks corresponding to bean creation and destruction; you can use PostConstruct and PreDestroy to receive these callbacks. From Chapter 4. Messaging and developing MDBs from EJB 3 in Action, Second Edition by Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan Publisher: Manning Publications Released: March 2014 Note Arrow from pool should go towards to "Bean does not exist", right?! Share this highlight http://www.safaribooksonline.com/a/ejb-3-in/17715174/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Have an account? Sign in. Minimise Unlock the rest of EJB 3 in Action, Second Edition and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.