java - UniqueConstrait on a table not working in Hibernate -

hibernate verstion 3.x

below table structure,

firstname | lastname | salary ----------------------------------- firstname | lastname | 100 firstname | lastname | 500 firstname | lastname | 1000 

below java code,

@entity  @table(name="table_name",schema="schemaname",     uniqueconstraints={@uniqueconstraint(columnnames={"firstname","lastname"})}) 

though have mentioned unique constraint on tuples 'firstname' , 'lastname', still able add rows same firstname , lastname values.

i thought, hibernateexception or otherwise , won't allowed add same firstname , lastname values multiple rows. don't have unique constraint created @ database level. there in code.

why able add duplicate rows? or understanding of unique constraint wrong?

have read javadoc?

it hint include unique constraint in generated ddl. not @ runtime. need create constraint @ database level.