How to unmap a mapping inheried from a @MappedSuperclass

Hi,
I have a superclass (annotated with @MappedSuperclass) which defines mappings for several fields.
Is it possible for me to inherit all of these mappings except one? Is it at all possible to eliminate a mapping that comes from the mapped superclass?
I tried with:
@AttributeOverride(name="theFieldToBeUnmapped", column=@Column(name=""))but, of course, it didn't work.
The mapped superclass is used by several other classes, so I shouldn't remove any fields from it. But in my concrete case one of the fields is not present in the underlying table and I should somehow eliminate its mapping.
Best regards,
Bisser
P.S. Something like:
@AttributeOverride(name="theFieldToBeUnmapped", column=@Transient)would have been great, had it been able to compile.

Hi James,
Thank you for replying.
Currently, the mapped superclass contains the definitions of five separate fields. All of them are mapped to the database.
There's some very specific logic for each of these fields. The logic is implemented in the class' methods. In order to avoid the duplication of that logic in many places, it was put in one single class that can be subclassed as needed.
In normal situations (that do not involve DB persistence), that would have to be implemented via the Strategy pattern for each of these fields. However, currently I don't know whether it's possible to make a JPA Entity that employs the Strategy pattern to encapsulate variation. I think it's not possible and I realize how hard it would have been to include such a feature in JPA.
However, as the class stands at the moment, it's not quite flexible. I will either get all the fields it contains or none at all. I cannot implement all possible field combinations in separate @MappedSuperclasses because (1) there will be a combinatorial explosion, (2) I cannot have multiple inheritance in Java, and (3) the idea is to have the specific methods in one place, not in many places. So, I can take this field out into a separate @MappedSubclass, but then over time somebody else will need to take some other field out and we'll have to create many combinations.
It seems that the best JPA-enabled solution (that is, without the Strategy pattern being involved) is to be able to unmap some of the fields that I don't need. For that purpose, it seems, I should go for the DescriptorCustomizer as you suggest.
Thank you!
Best regards,
Bisser

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