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Is this not covered by JPA inherently through the basic mapping of an attribute that holds a serialized type to a LOB field? Do we need anything special to represent the possible runtime support?
As mentioned above, this case is already addressed in JPA. It is address in 2 ways. Objects that are not annotated as @Entity will automatically be treated as serialized in the absence metadata that says to do other things. - This holds true for basic and for direct collections. If a user wants to override a mapping that contains an entity to serialize, they can override the default (OneToOne, or OneToMany) as Basic and then add a SerializedConverter through @Convert().
The Eclipselink project has moved to Github: https://github.com/eclipse-ee4j/eclipselink