[eclipselink-users] Exceptions when using generics (was Upgrade from 1.1

[Frank von Daak <f.vondaak.spam@xxxxxxxx>]

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