JPA Composite Key Example

Example.java

@Getter
@Setter
@Entity
@IdClass(MyEntity.CompositeKey.class)
@Table(name = "ENTITY_TABLE")
public class MyEntity implements Serializable {

    @Id
    @Column(name = "FIRST_ID", nullable = false)
    private String firstId;

    @Id
    @Column(name = "SECOND_ID", nullable = false)
    private String secondId;

    @Id
    @Column(name = "THIRD_ID", nullable = false)
    private String thirdId;

    @Column(name = "STRING_FIELD")
    private String stringField;

    @Column(name = "INT_FIELD")
    private Integer intField;

    @Getter
    @Setter
    public static class CompositeKey implements Serializable {
        String firstId;
        String secondId;
        String thirdId;
    }
}

@Repository
public interface MyEntityRepository extends CrudRepository<MyEntity, MyEntity.CompositeKey> {

}