Spring Boot JPA: One To One Shared Key Issue In Kotlin

Question

I cannot share the parent objects primary key with the child object in a One-To-One Unidirectional Relationship using Kotlin.

I've seen this issue solved in java with the following code:

MovieDetail movieDetail = new MovieDetail();
movie.setMovieDetail(movieDetail);
movieDetail.setMovie(movie); //<-- This is required
MovieRepository.save(movie);

That codes states that the MovieDetail needs a Movie object, because the Movie object contains the id that the MovieDetail will adopt.

However, in Kotlin it turns into a circular dependency where Movie requires a MovieDetail, and MovieDetail requires a Movie, and that Movie requires a MovieDetail and so on.

I don't know how to resolve this in Kotlin.

Here is my code:

@Entity
@Table(name = "movie")
data class Movie(
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", nullable = false, updatable = false)
    val id: Int,
    @Column(name = "movie_id", nullable = false, columnDefinition = "TEXT")
    val movieId: String,

    @OneToOne(cascade = [CascadeType.ALL])
    @PrimaryKeyJoinColumn
    var movieDetail: MovieDetail
)

@Entity
@Table(name = "movie_detail")
data class MovieDetail(
    @Id
    @Column(name = "id")
    val id: Int,
    @Column(name = "movie_id")
    val movieId: String,
    @Column(name = "title")
    val title: String
    
    @MapsId
    @OneToOne
    @JoinColumn(name = "id")
    var movie: Movie
)

class MovieDataSourceImpl(private val movieRepo: MovieRepo) : MovieDataSource {
...
    override fun createMovie(movie: Movie): Movie {
        return if (movieRepo.findById(movie.id).isEmpty) {
            val movieDetail = movie.movieDetail
            movieDetail.movie = movie
            movie.movieDetail = movieDetail
            movieRepo.save(movie)
        } else {
            throw IllegalArgumentException("A movie with the 'id' ${movie.id} already exists")
        }
    }
...
}

Here is the body of the POST request I'm making:

{
    "movieId": "1003",
    "posterPath": "myPosterPath",
    "movieDetail": {
        "movieId": "1003",
        "title": "title"
    }
}

Here is the error that I get:

It is complaining that a Movie object is missing from MovieDetail, this is the circular dependency that I mentioned.

JSON parse error: Instantiation of [simple type, class com.tinnovakovic.springboot.fluttermovierest.model.MovieDetail] value failed for JSON property movie due to missing (therefore NULL) value for creator parameter movie which is a non-nullable type; nested exception is com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException: Instantiation of [simple type, class com.tinnovakovic.springboot.fluttermovierest.model.MovieDetail] value failed for JSON property movie due to missing (therefore NULL) value for creator parameter movie which is a non-nullable type
 at [Source: (PushbackInputStream); line: 19, column: 5] (through reference chain: com.tinnovakovic.springboot.fluttermovierest.model.Movie["movieDetail"]->com.tinnovakovic.springboot.fluttermovierest.model.MovieDetail["movie"])]