How do Oracle Forms migrated with ORMIT™-OpenJava lock records? What happens when two users change the same record?

By default, ORMIT™-OpenJava uses optimistic locking: each record's keys carry a hash of the version of its data, so a record that another user changed between loading and saving can't be overwritten. ORMIT™-OpenJava also supports a mode without locking, where the last user to save wins.