Hibernate - Join Table with Composite ID

Question

I have a Person Table ( PersonID ), and an Address table ( AddressID ). I want to create a new Join table called Person_Address which maps Person->Adress using a ManyToMany relationship and I have to specify the primary key as a composition of the two primary keys ( PersonID - AddressID ).

How can I do that using Hibernate HBM syntax?

Answer 1

Use @ManyToMany and forget about join tables in Hibernate. The join table will exist in your database, but not in your code, Hibernate knows how to handle this.

Example:

Person class (as the owner of the relationship):

@ManyToMany(targetEntity = Address.class, cascade = { CascadeType.PERSIST, CascadeType.MERGE }, fetch = fetchType.LAZY)
@JoinTable(name = "person_address", joinColumns = @JoinColumn(name = "PersonID"), inverseJoinColumns = @JoinColumn(name = "AddressID"))
List<Address> addresses;

Address class (if it's required):

@ManyToMany(cascade = { CascadeType.PERSIST, CascadeType.MERGE }, mappedBy = "addresses", targetEntity = Person.class, fetch = FetchType.LAZY)
List<Person> persons;

Edit:

This link will help you with the many-to-many XML mapping.