Strategy to use the same UUID across multiple entities

Question

I have an entity classes in JPA as below in which maId acts as a primary key and foreign key for many other tables.

@Table(name = "Table1")
public class Test implements Serializable {
    @Id
    @Column(name = "maId", updatable = false, nullable = false)
    private String id;
 
    @OneToOne(optional = false, fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name="maId")
    private MFieldData fieldData;

    @OneToOne(optional = false, fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name="maId")
    private MPS mps;

    @OneToOne(optional = false, fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name="maId")
    private MJob mJob;

    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name="maId")
    private List<MExtension> mlExtensions;

    private Date createdDate;
    private Date lastUpdatedDate;
}

Now,this is my another entity.

@Table(name = "table 2")
public class Test implements Serializable {
    @Id
    @Column(name = "maId", updatable = false, nullable = false)
    private String maId;
    private Integer cmd;
    private String routeId;
}

By the time I receive a request this is API. I need to Insert the data across multiple tables.

How to implement a custom UUID (maId) generator and use it in @Id?
I need to use the same maId which is the unique id for this request across multiple entities while inserting into the DB. I am using a dirty way to do that. But is there any JPA way to solve this problem?

Any help would be highly appreciated!

These are two separate questions. Please make them separate posts. — Jens Schauder, Feb 26 '21 at 06:57
One question is answered here https://stackoverflow.com/a/6356933/66686 — Jens Schauder, Feb 26 '21 at 06:58
The other question needs more details about what the actual problem is. — Jens Schauder, Feb 26 '21 at 06:59

score 1 · Answer 1 · answered Feb 26 '21 at 17:22

The request has to pass the UUID (Called correlation-id) to track. https://docs.oracle.com/javase/7/docs/api/java/util/UUID.html can be used. If you generate in code it may go unknown to caller. The correlation-id is used to track the request data across systems it may travel due to event publish as well.

Strategy to use the same UUID across multiple entities

1 Answers1