Why am I getting Mapping Exception?

Question

I am getting :

org.hibernate.MappingException: Foreign key (FKBB979BF4266AA123:address [a_id]))
must have same number of columns as the referenced 
primary key (         


        

Answer 1

You need to create a reference table:

    CREATE TABLE PersonsAddresses (personId BIGINT, addressId BIGINT)

and change the mapping of the set to this: