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Re: [eclipselink-users] Exceptions when using generics (was Upgrade from 1.1.0-M5 to 2.0.2)
|
Frank,
Correction, I see Entity MyClass extends MappedSuperclass MyGeneric
where F is of type MyGenericType
In this case MyField still must be an Entity, however a
MyGenericType subclass of MyField could still be a MappedSuperclass as
in an MS-->E hierarchy like CoordinateMS --> GalacticPosition in our JPA
test model
UML:
http://wiki.eclipse.org/EclipseLink/Development/JPA_2.0/metamodel_api#Mapped_Superclass_Test_Model
Code:
http://fisheye2.atlassian.com/browse/eclipselink/trunk/jpa/eclipselink.jpa.test/src/org/eclipse/persistence/testing/models/jpa/metamodel/CoordinateMS.java?r=HEAD
- retesting
/michael
Michael O'Brien wrote:
Frank,
Hi, I could find no relationship to the MyClass entity in the
MyGeneric mappedSuperclass.
If MyClass would actually be MyField - then the code should
validate ok.
Could you supply the code for the MyField class (F in this case
should be a concrete entity subclass in your client code).
Normally relationships out of MappedSuperclasses must be only to
entities.
For example I get the following expected exception when i target a
MappedSuperclass as the target of a OneToOne
Internal Exception: Exception [EclipseLink-7250] (Eclipse Persistence
Services - org.eclipse.persistence.exceptions.ValidationException
Exception Description: [class
org.eclipse.persistence.example.dataparallel.model.ScalarProcessingUnit]
uses a non-entity [class
org.eclipse.persistence.example.dataparallel.model.ProcessingUnit] as
target entity in the relationship attribute [field westUnit].
at
org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:210)
@MappedSuperclass
public abstract class Core {}
@MappedSuperclass
public abstract class ProcessingUnit<P extends Core> implements
Serializable {
@OneToOne
private ProcessingUnit<P> westUnit;
}
@Entity(name="DparPU")
public class ScalarProcessingUnit extends ProcessingUnit implements
Serializable {}
If I instead reference the entity subclass for the @OneToOne
(virtually the same as a @ManyToOne) - I no longer get a validation
exception.
@OneToOne
private ScalarProcessingUnit westUnit;
thank you
/michael
Frank von Daak wrote:
Hello again,
after searching the whole day for a solution, I try to get a little
help on the list.
After upgrading from Eclipselink 1.1.0 to 2.0.2, I always get
Exceptions, when starting up the application:
Caused by: Exception [EclipseLink-7250] (Eclipse Persistence Services
- 2.0.2.v20100323-r6872):
org.eclipse.persistence.exceptions.ValidationException
Exception Description: [class de.myapp.domain.MyClass] uses a
non-entity [class java.lang.String] as target entity in the
relationship attribute [field myfield].
I am using Generics - mabye, this causes the problem!?
The classes look like this:
--------------------------------------------
@Entity
public class MyClass extends MyGeneric<MyGenericType>{
......
} --------------------------------------------
@MappedSuperclass
@Cache(type=CacheType.NONE, alwaysRefresh=true)
public abstract class MyGeneric <F extends MyField > implements
MyInterface {
@ManyToOne
private F myfield; ....
}
--------------------------------------------
What is wrong with this code?
Who can give me a little help?
Thank you very much!
Frank
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