Entity Beans / Callbacks - II
ejbPostCreate() method is invoked by the container after ejbCreate() method invocation on the instance.
ejbActivate() method invocation informs the instance that an EJB Object is associated with this instance and it can expect business method calls.
ejbPassivate() method invocation informs the instance that an EJB Object is disassociated.
ejbRemove() method is invoked by the container upon receiving a remove() request from the client. The bean implementation should remove its entity representation from the database.