One-To-Many Relationship in Spring Data JPA

Question

I would like to have a One-to-many relationship between 2 Entities, Consumer and Policy. One consumer should have several policies.

This is an example of a Consumer

Answer 1

Try this code :)

Your Consumer Class

@Entity
public class Consumer {

    @Id
    @GeneratedValue
    @Column(name = "consumer_id")
    private Integer id;

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

    @Column(name = "endpoint")
    private String endpoint;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "idPolicy")
    private List policies;


    public Consumer() {
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEndpoint() {
        return endpoint;
    }

    public void setEndpoint(String endpoint) {
        this.endpoint = endpoint;
    }

    public List getPolicies() {
        return policies;
    }

    public void setPolicies(List policies) {
        this.policies = policies;
    }
}

Be aware that in the mapped by, you should use the name of the column that references Policy in your database, so if it's no policyId, use the name you gave to it

Your Policy Class

@Entity
public class Policy {
        @Id
        @GeneratedValue
        @Column(name = "id")
        private Integer id;

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

        @ManyToOne(optional = false)
        private Consumer consumer;

        public Policy() {

        }

        public Integer getId() {
            return id;
        }

        public void setId(Integer id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

}