PUBLIC: Rollback the active database transaction. This allows a group of database modification to be commited or rolledback as a unit. All writes/deletes will be sent to the database be will not be visible to other users until commit. Although databases do not allow nested transaction, EclipseLink supports nesting through only committing to the database on the outer commit.
@exception DatabaseException if the database connection is lost or the rollback fails.
@exception ConcurrencyException if this session is not within a transaction.
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