When storing values using JPA, how to assign a key value to a class field mapped to @AnyToOne (see Foreign Key)

EntityTo establish a relationship inside, we mapped it using the @AnyToOne annotation. For example:

@Entity
public class Book {
    @Id
    @GeneratedValue
    private long id;

    @Column
    private String name;

    @ManyToOne(fetch = FetchType.LAZY)
    private Publisher publisher

    // // getter & setter
}

@Entity
public class Publisher {
    @Id
    @GeneratedValue
    private long id;

    @Column
    private String name;

    // // getter & setter
}

In order to store the value of publisher when each generated table name is book, publisher and PK(=id) is 1, we tried to deliver the JONSODE as follows.

Controller:

@PutMapping(value = "/books")
public ResponseEntity createBook(@RequestBody Book book) {
    bookRepository.save(book);

    // Omitted
}

the body of the request :

{
  "name" : "jpa in action",
  "publisher" : "1"
}

I roughly summarized the contents and wrote it. The problem is that if you pass the body of the request as shown above, the Publisher entity does not have a constructor with a single numeric type parameter and cannot process the request.

Is there a way to inquire and store the value automatically referenced by passing PK (=id) in the body of the request, just as PK (=id) using a pre-implemented function such as FindOne? Or in the logic above, should I take a separate PK(=id) value as a field, look up Publisher directly, and manually work on Book object like

The actual database table contains a value of Foreign Key which would be publisher_id in the above situation. Therefore, even if "publisher_id" : 1, was added to the request body, the value was not saved in the publisher_id column of the actual table. What should I do?