Question

Im facing an issue with The following:

public class Person {

    private long id;
    private String name;
    private List<Relation> relations;
    ....
}

public class Relation {

     private Person person;
     private Person relatedWith;
     private String relationType;
}

The goal is to annotate these classes with JPA so any given person can have a relation with any other person.(thus manytomany)
The relation table should have a combined primary key consisting of the person.id and the relatedWith.id.

How can i do this?
Thanks for your help!
Richard

Answer 1

You should not use combined primary key, use a generated one (e.g. sequence or autoincrement column for Relation table) and then you’ll have two foreign keys back to the Person table.