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

For a ManyToMany Relationshhip you need a dedicated mapping table

6.2.4. Collections of values and many-to-many associations

i.e. You need something like a PersonAddress Table

CREATE TABLE personaddress (p_id integer, a_id integer)

Where p_id is a FK Reference to the Person Table and a_id a FK Reference to the Address Table