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Canonical model class is not working after changing the class name [message #1067495]

Tue, 09 July 2013 06:08

Saravanan Subiramaniam

Messages: 10
Registered: April 2013

Junior Member

By default, eclipselink generates the canonical model classname which is same as the entity class name with the default suffix '_'. However, I wanted to change the generated canonical meta model class name, so I created custom CanonicalModelProcessor extending eclipselink's CanonicalModelProcessor.

For instance, my entity name is EmployeeEntity and wanted to generate meta model class as Employee_.java (instead of EmployeeEntity_.java).

So, my generated class looks like:

@Generated(value="EclipseLink-2.3.2.v20111125-r10461", date="2013-07-09T07:54:49")
@StaticMetamodel(EmployeeEntity.class)
public class Employee_ {
public static volatile SingularAttribute<EmployeeEntity, Integer> id;
}

But it looks like the meta model is initialized only if the name matches with the entity name. Because when I access Employee_.id.getName() --> it returns null. Can anyone explain this behaviour? Is it necessary for the meta model class to have the same name as that of entity name?

[Updated on: Tue, 09 July 2013 16:37]

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Re: Canonical model class is not working after changing the class name [message #1067620 is a reply to message #1067495]

Tue, 09 July 2013 15:33

Chris Delahunt

Messages: 1389
Registered: July 2009

Senior Member

EclipseLink I believe pulls the entity class to be used with the Canonical metamodel class from the StaticMetamodel annotation. You should be specifying EmployeeEntity.class within the annotation instead of EmployeePersistable.class if that is the Entity it should be associated with.

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Re: Canonical model class is not working after changing the class name [message #1067626 is a reply to message #1067620]

Tue, 09 July 2013 16:36

Saravanan Subiramaniam

Messages: 10
Registered: April 2013

Junior Member

Hi Chris,
Yes, I was specifying EmployeeEntity.class in StaticMetamodel annotation (it was a typo mistake in earlier thread).

[Updated on: Tue, 09 July 2013 16:38]

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Re: Canonical model class is not working after changing the class name [message #1067646 is a reply to message #1067626]

Tue, 09 July 2013 19:30

Chris Delahunt

Messages: 1389
Registered: July 2009

Senior Member

Try turning on logging to Finest, as you should see "Canonical Metamodel class [{0}] not found during initialization." and "Canonical Metamodel class [{0}] found and instantiated during initialization." messages logged at the Finer level under the Metamodel category. Also verify that you are calling em or emf.getMetamodel() first in case the persistence unit hasn't been fully initialized yet. If it is showing the default names are being searched for, check that the Employee_ classes can be found by the persistence unit - adding them to the persistence.xml list of classes or by ensuring the exclude-unlisted-classes tag is set to false and that they are located within the same jar as the entities so their annotations can be processed the same way.

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