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session.save(myTable)doesn't return anint. It however, returnsjava.io.serializableand thegetGeneratedKeys()method is not supported by any implementation of the JDBC drivers until now. So neither of the two cases which you mentioned would be successful as obvious. Do they really work?Integerdoes implementSerializable. So using boxing you can get an int out ofsession.save(myTable), provided of course that the mapping of your table is such as to return an int. This method works. I have successfully tested getGeneratedKeys method with MySQL JDBC driver.