Vector2 converter not working on iOS

[unnanego]

I have both packages (latest versions) installed from the jilleJr source. It works fine in the editor, but gives the "self referencing" error on iOS. Unity version 2020.3.18f

[applejag]

Hi @unnanego! Thanks for reaching out :)

I'm lacking context through. The error message is too general.

Could you supply me with the full error message? I know it's tricky to get it from the phone, but if you could get the errors forwarded to your editor then you can copy it from the logs there.

If you could provide the C# types you are trying to use as well that would help a lot.

And does the error occur on serialization (to-string) or deserialization (from-string)?

[unnanego]

JsonSerializationException: Self referencing loop detected for property 'normalized' with type 'UnityEngine.Vector2'. Path '[0].AutoPoint'.
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CheckForCircularReference (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonProperty property, Newtonsoft.Json.Serialization.JsonContract contract, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x00000] in <00000000000000000000000000000000>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonContainerContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonProperty property, Newtonsoft.Json.Serialization.JsonContract& memberContract, System.Object& memberValue) [0x00000] in <00000000000000000000000000000000>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonObjectContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract collectionContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x00000] in <00000000000000000000000000000000>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonObjectContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract collectionContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x00000] in <00000000000000000000000000000000>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList (Newtonsoft.Json.JsonWriter writer, System.Collections.IEnumerable values, Newtonsoft.Json.Serialization.JsonArrayContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonContainerContract collectionContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x00000] in <00000000000000000000000000000000>:0 
  at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize (Newtonsoft.Json.JsonWriter jsonWriter, System.Object value, System.Type objectType) [0x00000] in <00000000000000000000000000000000>:0 
  at Newtonsoft.Json.JsonSerializer.SerializeInternal (Newtonsoft.Json.JsonWriter jsonWriter, System.Object value, System.Type objectType) [0x00000] in <00000000000000000000000000000000>:0 
  at Newtonsoft.Json.JsonConvert.SerializeObjectInternal (System.Object value, System.Type type, Newtonsoft.Json.JsonSerializer jsonSerializer) [0x00000] in <00000000000000000000000000000000>:0 
  at Location.SaveJson () [0x00000] in <00000000000000000000000000000000>:0 
  at UnityEngine.Events.UnityAction.Invoke () [0x00000] in <00000000000000000000000000000000>:0 
  at UnityEngine.Events.UnityEvent.Invoke () [0x00000] in <00000000000000000000000000000000>:0 
  at UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1].Invoke (T1 handler, UnityEngine.EventSystems.BaseEventData eventData) [0x00000] in <00000000000000000000000000000000>:0 
  at UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) [0x00000] in <00000000000000000000000000000000>:0 
  at UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchPress (UnityEngine.EventSystems.PointerEventData pointerEvent, System.Boolean pressed, System.Boolean released) [0x00000] in <00000000000000000000000000000000>:0 
  at UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchEvents () [0x00000] in <00000000000000000000000000000000>:0 
  at UnityEngine.EventSystems.StandaloneInputModule.Process () [0x00000] in <00000000000000000000000000000000>:0 
UnityEngine.EventSystems.ExecuteEvents:Execute(GameObject, BaseEventData, EventFunction`1)
UnityEngine.EventSystems.StandaloneInputModule:ProcessTouchPress(PointerEventData, Boolean, Boolean)
UnityEngine.EventSystems.StandaloneInputModule:ProcessTouchEvents()
UnityEngine.EventSystems.StandaloneInputModule:Process()

[unnanego]

It happens on serialization.

The type:

public struct Coordinates
{
	public float Latitude
	{
		get;
	}

	public float Longitude
	{
		get;
	}

	public Vector2? AutoPoint;
	public Vector2? ManualPoint;

	public Coordinates(float latitude, float longitude)
	{
		Latitude = latitude;
		Longitude = longitude;
		AutoPoint = new Vector2(0f, 0f);
		ManualPoint = null;
	}
}

[applejag]

Awesome, thanks for clarifying!

My guess is that this is caused by the Converter getting stripped out as it's not explicitly referenced.

Try save the following as link.xml anywhere in your Assets directory, such as directly at Assets/link.xml:

<linker>
    <assembly fullname="Newtonsoft.Json.UnityConverters" />
</linker>

If that solves the issue, then I can update the Newtonsoft.Json-for-Unity.Converters package so the stripping is disabled by default.

---

If you want to know more about this stripping mechanic of the compilation process, I recommend the following documents:

• https://github.com/jilleJr/Newtonsoft.Json-for-Unity/wiki/What-even-is-AOT
• https://github.com/jilleJr/Newtonsoft.Json-for-Unity/wiki/Fix-AOT-using-link.xml
• https://github.com/jilleJr/Newtonsoft.Json-for-Unity/wiki/Reference-link.xml

[unnanego]

Yes, it did the trick, thank you!

[applejag]

I'm reopening this and using it to track that I need to fix this permanently.

I've also moved this issue the converters repo.

If you stay subscribed to this issue, then you can get a notification when this has been fixed with a new version, and can then remove that link.xml hack.

[Wobling]

Just came across this when building for WebGL.
The stripping was indeed the issue, thanks for the solution, and thanks for your hard work supporting this project.

[haastregt]

I have the exact same issue trying to build for Android (Quest 3, so using IL2CPP)
Trying to serialize a Vector3 gives a self-referencing error (only in the build, works fine in the editor):

JsonSerializationException: Self referencing loop detected for property 'normalized' with type 'UnityEngine.Vector3'. Path 'leftPose.position'.
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CheckForCircularReference (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonProperty property, Newtonsoft.Json.Serialization.JsonContract contract, Newtonsoft.Json.Serialization.JsonContainerContract containerContract, Newtonsoft.Json.Serialization.JsonProperty containerProperty) [0x00000] in <00000000000000000000000000000000>:0
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues (Newtonsoft.Json.JsonWriter writer, System.Object value, Newtonsoft.Json.Serialization.JsonContainerContract contract, Newtonsoft.Json.Serialization.JsonProperty member, Newtonsoft.Json.Serialization.JsonProperty property, Newtonsoft.Json.Serialization.JsonContract& memberContract, System.Object& memberValue) [0x00000] in <00000000000000000000000000000

Unfortunately, the Assets/link.xml file does not solve the issue for me. It looks as follows:

<linker>
  <assembly fullname="Newtonsoft.Json.Converters" preserve="all"/>
  <assembly fullname="Newtonsoft.Json.UnityConverters" preserve="all"/>
</linker>

Using Unity 6000.0.37f1
Newtonsoft Json 3.2.1
This package version 1.6.3

Am I missing anything? or did something break again with newer versions?

EDIT: Might be that this is an issue not necessarily with this package. If I write a converter myself I get the same issue

    var settings = new JsonSerializerSettings
    {
        Converters = {
            new Vec3Conv()
        }
    };
    var json = JsonConvert.SerializeObject(new Vector3(1.0f, 2.0f, 0.5f), settings);


public class Vec3Conv : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        if (objectType == typeof(Vector3))
        {
            return true;
        }
        return false;
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        var t = serializer.Deserialize(reader);
        var iv = JsonConvert.DeserializeObject<Vector3>(t.ToString());
        return iv;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        Vector3 v = (Vector3)value;

        writer.WriteStartObject();
        writer.WritePropertyName("x");
        writer.WriteValue(v.x);
        writer.WritePropertyName("y");
        writer.WriteValue(v.y);
        writer.WritePropertyName("z");
        writer.WriteValue(v.z);
        writer.WriteEndObject();
    }
}

[applejag]

@haastregt do you have this issue if you also add the [Preserve] attribute to your own custom converter?

Another thing you could check is if you're overriding the default serialization options anywhere. It could be that the converters are preserved, but your specific DeserializeObject call just simply doesn't use them.