Simplest way to use @JsonManagedReference

[davidmoser]

We're trying to use @JsonManagedReference but so far the @JsonBackReference is null when we deserialize.

We tried the approach from #129 .
But actually this test doesn't check that the back reference is set when deserializing. We added
assertNotNull(value.colors.single().car)
and then the test fails.

The example from #149 works, but it uses a backing field, which we'd prefer not to use.

What's the simplest way to get the example from #129 to work?

[NeonMika]

I have exactly the same problem that the "solution" from #129 (which is missing an assertNotNull) does not work, since the field that should be set through @JsonBackReference is still null.

This is the solution proposed in #129 (which is not working):

data class Car(
    val id: Long,
    @JsonManagedReference
    val colors: MutableList<Color> = mutableListOf()
)

data class Color (
    val id: Long,
    val code: String) {

    @JsonBackReference
    lateinit var car: Car
}

I found out that it is working if do not only pull the @JsonBackReference out of the constructor (and make it a lateinit var), but if you also pull the @JsonManagedReference out of the constructor.
The following code is working on my machine:

data class Car(
        val id: Long) {
    @JsonManagedReference
    val colors: MutableList<Color> = mutableListOf()
}

data class Color(
        val id: Long,
        val code: String) {
    @JsonBackReference
    lateinit var car: Car
}

[BrunoRosendo]

I have exactly the same problem that the "solution" from #129 (which is missing an assertNotNull) does not work, since the field that should be set through @JsonBackReference is still null.

This is the solution proposed in #129 (which is not working):

data class Car(
    val id: Long,
    @JsonManagedReference
    val colors: MutableList<Color> = mutableListOf()
)

data class Color (
    val id: Long,
    val code: String) {

    @JsonBackReference
    lateinit var car: Car
}

I found out that it is working if do not only pull the @JsonBackReference out of the constructor (and make it a lateinit var), but if you also pull the @JsonManagedReference out of the constructor. The following code is working on my machine:

data class Car(
        val id: Long) {
    @JsonManagedReference
    val colors: MutableList<Color> = mutableListOf()
}

data class Color(
        val id: Long,
        val code: String) {
    @JsonBackReference
    lateinit var car: Car
}

A true life saver, but it'd be nice to have this working with the constructor too. I spent some considerable time debugging until I got to this thread