Unique Constraint Over Multiple Columns
There is no Hibernate annotation that checks uniqueness before insert/update. But there is annotation which will generate such a constraint to database if automatic database creation is used:
@Table( name="ACTIVE_BAND", uniqueConstraints= @UniqueConstraint(columnNames={"active_band_user", "active_band_date"}))
In a more modern syntax, it would be :
@Table( name="ACTIVE_BAND", uniqueConstraints = [UniqueConstraint( columnNames = ["active_band_user", "active_band_date"] )])