About rollback

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[ODB1] Chapter 3 - Persistent Classes

when the persistent fields are going to be cleared at transaction end (for example on rollback
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[ODB1] Chapter 4 - JDO Metadata

is never stored in the database. The main difference is that, on transaction rollback, it returns automatically
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[ODB1] Chapter 6 - Persistent Objects

the persistence by reachability rule. Of course, if the transaction is ended with rollback() and not