Integration

Hi,

I've to build a kind of 'listener' to save some data on database when an entity changes. Something similar than this example (http://wiki.eclipse.org/EclipseLink/Examples/JPA/Auditing#Example_AuditedObject_class), altought it's not exactly the same.

My first approach has been using JPA events like @preUpdate but i've read in the JPA 2.0 Spec (http://download.oracle.com/otn-pub/jcp/persistence-2.0-fr-eval-oth-JSpec/persistence-2_0-final-spec.pdf) that an Entity lifecycle listener should not access EntityManager or execute Query operations (p. 93)

----- "+In general, the lifecycle method of a portable application should not invoke EntityManager or Query operations, access other entity instances, or modify relationships within the same persistence context.[43] A lifecycle callback method may modify the non-relationship state of the entity on which it is invoked.+"
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The first question is: if i use DescriptorEvent class (which as far as i know, is not part of the JPA standard, but it's part of TopLink implementation), does this restriction apply? Or could i safely insert/update database inside DescriptorEvent events?

And .. if it should work, what happens with transactions? Can i choose whether the event's code works within the same transaction than the entity change or if it's another transaction? Or it'd be in the same transaction?

Thanks in advance

Edited by: 920634 on 13-mar-2012 22:21

Edited by: 920634 on 13-mar-2012 22:21

Edited by: 920634 on 13-mar-2012 22:21