@embeddedid

@Embeddable
public class BookId implements Serializable {

    private String author;
    private String name;

    // standard getters and setters
}

Source: baeldung.com

@embeddedid

@Entity
public class Book {

    @EmbeddedId
    private BookId id;
    private String genre;
    private Integer price;

    //standard getters and setters
}

Source: baeldung.com

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