> It also is the central place for entities "id" field: DataNucleus, the project (as opposed to the Google plugin), only "insists" that something is enhanced if you are using its fields/ properties as persistent. If this class has an "id" field and you expect that field to be persisted then ***JDO*** (or JPA for that matter too) requires that this class is persistable. If instead you have a field "id" in that class yet you define a (persistent) property (getId()/setId()) in the persistable subclasses as then that superclass doesn't have to be persistable ... i.e as per the JDO/JPA specs
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