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I have been using @Id annotation for generation of primary keys.
I am using my SQL as the database. its working fine with mysql if I write @Id(generate=generatorType.AUTO)
but it is not working with Oracle database.
what should change in the annotation to make it portable for oracle and mysql.
It is studied that generatorType.AUTO is portable for any database vendor but its not true if used with Oracle.
Please put some lights on it.

Thanks.

Check how is the table designed?
If your field is really primary key and incrementable.