I am working on an application that uses JPA to store certain classes to the datastore. I was wondering what happens if I add (or remove) members to the class in a future version of the application. I would already have data stored with the old properties in the datastore. I know that the datastore has no problem with different entities of the same kind having different properties, but how does JPA handle this. What happens if I read an entity that doesn't have a property that corresponds to the new member in the new class? What happens if it has a property for a member that I removed? Does it work differently with JDO?
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