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Loading a group crashes due to roleIdsToView being null #7

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Loading a group crashes due to roleIdsToView being null#7

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Type: BugThere is a **factual incorrectness** in the specThere is a **factual incorrectness** in the spec

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on Sep 3, 2025

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I am attempting to load a group with the following code:

String groupId = ""; // Fill in a group ID here
GroupsApi groupsApi = new GroupsApi();
Group group = groupsApi.getGroup(groupId, false);

This crashes with the following exception:

Error: Expected the field `roleIdsToView` to be an array in the JSON string but got `null`
java.lang.IllegalArgumentException: Expected the field `roleIdsToView` to be an array in the JSON string but got `null`
	at io.github.vrchatapi.model.GroupGallery.validateJsonObject(GroupGallery.java:481)
	at io.github.vrchatapi.model.Group.validateJsonObject(Group.java:1218)
	at io.github.vrchatapi.model.Group$CustomTypeAdapterFactory$1.read(Group.java:1263)
	at io.github.vrchatapi.model.Group$CustomTypeAdapterFactory$1.read(Group.java:1253)
	at com.google.gson.TypeAdapter$1.read(TypeAdapter.java:308)
	at com.google.gson.Gson.fromJson(Gson.java:1361)
	at com.google.gson.Gson.fromJson(Gson.java:1262)
	at com.google.gson.Gson.fromJson(Gson.java:1171)
	at com.google.gson.Gson.fromJson(Gson.java:1137)
	at io.github.vrchatapi.JSON.deserialize(JSON.java:340)
	at io.github.vrchatapi.ApiClient.deserialize(ApiClient.java:851)
	at io.github.vrchatapi.ApiClient.handleResponse(ApiClient.java:1061)
	at io.github.vrchatapi.ApiClient.execute(ApiClient.java:985)
	at io.github.vrchatapi.api.GroupsApi.getGroupWithHttpInfo(GroupsApi.java:2606)
	at io.github.vrchatapi.api.GroupsApi.getGroup(GroupsApi.java:2584)

Looking into this, it does appear that that field is marked as nullable in the specification: https://github.com/vrchatapi/specification/blob/main/openapi/components/schemas/GroupGallery.yaml#L21

and the raw response from the server looks like this:

{
"roleIdsToView": null,
}

Inspecting the generated code and setting a breakpoint leads me to this generated code snippet:

      // ensure the optional json data is an array if present
      if (jsonObj.get("roleIdsToView") != null && !jsonObj.get("roleIdsToView").isJsonArray()) {
        throw new IllegalArgumentException(String.format("Expected the field `roleIdsToView` to be an array in the JSON string but got `%s`", jsonObj.get("roleIdsToView").toString()));
      }

Setting a breakpoint on the throw line reveals that jsonObj.get("roleIdsToView") is not set to null, but to JsonNull:

causing the check for null to fail and the code to crash. I'm assuming this would affect other nullable fields as well; is there a flag or something that needs to be changed with the codegen to fix this?

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ariesclark
assigned
jellejurre
on Sep 3, 2025
ariesclark
added
Type: BugThere is a **factual incorrectness** in the specThere is a **factual incorrectness** in the spec
on Sep 3, 2025

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jellejurre

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Type: BugThere is a **factual incorrectness** in the specThere is a **factual incorrectness** in the spec

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