Composite Primary Key using MongoDB and Spring Data JPA

Question

Could someone tell how to create a composite key in Spring Data JPA using Mongo DB

Answer 1

You cannot use MongoDB with Spring Data JPA because JPA is for relational databases like MySQL.

Instead you have to use Spring Data MongDB and you will find the documentation here:

https://docs.spring.io/spring-data/mongodb/docs/2.1.8.RELEASE/reference/html/

But here's an example with a composite key:

class StudentChairman {

    @Id
    private CompositeKey id;

    // getters and setters

    static class CompositeKey implements Serializable {
        private String studentId;
        private String groupId;

        // getters and setters
    }
}