Create relation / link one to one between 2 entities using spring data rest

Question

Following this tutorial https://www.baeldung.com/spring-data-rest-relationships I'm trying to reproduce the link creation onetoone between 2 entities with a rest put call.

However I've got the following error message when I try to link addresses/1 & libraries/1/libraryAddress curl -i -X PUT -d " http://localhost:8080/addresses/1 " -H "Content-Type:text/uri-list" http://localhost:8080/libraries/1/libraryAddress

"Must send only 1 link to update a property reference that isn't a List or a Map"

Detail:

// Data model
// Master library class which have one address
@Entity
public class Library {

    @Id
    @GeneratedValue
    private long id;

    @Column
    private String name;

    @OneToOne
    @JoinColumn(name = "address_id")
    @RestResource(path = "libraryAddress", rel="address")
    private Address address;

    // standard constructor, getters, setters
}

// Address linked with a onetoone relation with library
@Entity
public class Address {

    @Id
    @GeneratedValue
    private long id;

    @Column(nullable = false)
    private String location;

    @OneToOne(mappedBy = "address")
    private Library library;

    // standard constructor, getters, setters
}

// Repositories
public interface LibraryRepository extends CrudRepository<Library, Long> {}
public interface AddressRepository extends CrudRepository<Address, Long> {}

queries made with the rest api:

create a library

curl -i -X POST -H "Content-Type:application/json"
  -d '{"name":"My Library"}' http://localhost:8080/libraries

create an adress

curl -i -X POST -H "Content-Type:application/json"
  -d '{"location":"Main Street nr 5"}' http://localhost:8080/addresses

create the association

curl -i -X PUT -d "http://localhost:8080/addresses/1"
  -H "Content-Type:text/uri-list" http://localhost:8080/libraries/1/libraryAddress

--> Error {"cause":null,"message":"Must send only 1 link to update a property reference that isn't a List or a Map."}

Have you got any clues to resolve this problem?

Regards, Blured.

Answer 1

It's actually a bug in Spring Boot 2.2.0 org.springframework.data.rest.webmvc.RepositoryPropertyReferenceController class at line 321:

if (source.getLinks().hasSingleLink()) {
        throw new IllegalArgumentException(
            "Must send only 1 link to update a property reference that isn't a List or a Map.");
}

It should be:

if (!source.getLinks().hasSingleLink()) {
        throw new IllegalArgumentException(
            "Must send only 1 link to update a property reference that isn't a List or a Map.");
}

Here is the code for String Boot 2.1.7

if (source.getLinks().size() != 1) {
        throw new IllegalArgumentException(
            "Must send only 1 link to update a property reference that isn't a List or a Map.");
}

Answer 2

This kind of orders are compliant with 2.1.10.BUILD-SNAPSHOT but not with spring-boot 2.2.0.RELEASE

Things might have changed in this version. I will look at that. However thanks for having pointing that.

Somebody has already managed to run those kind of rest calls with 2.2.0?