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Re: [eclipselink-users] How to use EclipseLink Native API with JPA
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Regarding that other persistence providers and their need for "weaving":
openjpa does instrument / modify your get and setters inorder to track
Entity changes,
thats why openjpa throws warnings on deployment if you ever does access
a property without using the get set methods.
gsilverman skrev:
I appreciate all the replies, but when I try to use Eclipselink sessions and
unitOfWork to create or modify a managed entity, I get the following error:
Local Exception Stack:
Exception [EclipseLink-7009] (Eclipse Persistence Services - 1.0 (Build 1.0
- 20080707)): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Missing descriptor for [class java.lang.Class].
Verify that the descriptor has been properly registered with the Session.
I can get sessions and acquire unitOfWork from the JPA EntityManager, and I
can even query for entities without any problem. However, when I try to use
transactions and call commit on a session or unitOfWork, I get the error
noted above.
This leads me to believe you can't use EclipseLink extensions using just
persistence.xml, annotations and orm to describe your persistence entities.
It seems you also have to use sessions.xml and project.xml and Eclipselink
descriptor files - an XML nightmare I'd rather avoid. Is the documentation
wrong on this?
As for the issue of weaving, if the JPA spec already includes the capability
for lazy loading of entities, why is weaving necessary if Eclipselink is my
persistence provider? Is this true of other persistence providers? I don't
recall ever having to use it for the original TopLink implementation in Java
EE. I don't believe it's required for OpenJPA or Hibernate, either. Weaving
seems to me to be a serious problem for developers, since it modifies
original code, with who-knows-what side affects, and makes debugging
practically impossible.
Maybe it's a Spring thing?
