first problem:

I have a UNIQUE constraint in postgres database, on a column class_name in a table class_definition, and also have primary key with class_id_pk , when i load a session Factory, with option in hibernate.cfg.xml <property>name="hibernate.hbm2ddl.auto"> update </property>

i get error schema could not be completed, and null pointer exception. i have used attribute unique="true" in hbm.xml, but still i am getting the same error.

second problem:

i have two tables one is class_definition with having column named class_id_pk which is primary key, and there is another table state_classes with column class_id_fk having the foreign key reference of class_id_pk. when i load session factory, it creates the extra empty column with name class_id_pk in state_classes table... i dont want this to happen adding unnecessary extra column...

how to solve these two problems in hibernate? is there any attribute to avoid creation of extra column?

plz any help, want quick reply

bye