I am stuck with this part of CMRelationship... what I understand from page 396, HFEJB is-> in the ejbcreate()I have 5 fields of which 4 are inserted into the database and for the 5th one I wait till ejbPostCreate() and do a setDirector(dir)....by doing so what did the database get as the 5th field( ie how did the directorID get into the database ?) HOW IS THE FOREIGN KEY PROCESSING DONE? THROW SOME LIGHT ...PLEASE thanks Pradeep
Failure is not when you fall down; its only when you fail to get up again.
You'll definitely drive yourself crazy if you are hoping this will be clear from the ejb-jar.xml descriptor content. The real mechanics are container-specific, and much clearer with some containers like JBoss. As far as ejb-jar.xml and the bean callback methods are concerned, you can think of it like this: 0. before ejbCreate, the container doesn't know the pk of the new entity. 1. ejbCreate() populates the data for the current entity, including the fields necessary to define the pk, but excluding any CMR foreign-key references. 2. After ejbCreate, but before ejbPostCreate, the container knows the pk for your new entity. 3. ejbPostCreate() deals both with storing foreign keys into your new entity, *and* providing your pk as a foreign key value to other entities (remember, your deployment descriptor might specify that the relationship is navigable in both directions).
Reid - SCJP2 (April 2002)
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