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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Loading a group crashes due to roleIdsToView being null","articleBody":"I am attempting to load a group with the following code:\n\n```java\nString groupId = \"\"; // Fill in a group ID here\nGroupsApi groupsApi = new GroupsApi();\nGroup group = groupsApi.getGroup(groupId, false);\n```\n\nThis crashes with the following exception:\n```\nError: Expected the field `roleIdsToView` to be an array in the JSON string but got `null`\njava.lang.IllegalArgumentException: Expected the field `roleIdsToView` to be an array in the JSON string but got `null`\n\tat io.github.vrchatapi.model.GroupGallery.validateJsonObject(GroupGallery.java:481)\n\tat io.github.vrchatapi.model.Group.validateJsonObject(Group.java:1218)\n\tat io.github.vrchatapi.model.Group$CustomTypeAdapterFactory$1.read(Group.java:1263)\n\tat io.github.vrchatapi.model.Group$CustomTypeAdapterFactory$1.read(Group.java:1253)\n\tat com.google.gson.TypeAdapter$1.read(TypeAdapter.java:308)\n\tat com.google.gson.Gson.fromJson(Gson.java:1361)\n\tat com.google.gson.Gson.fromJson(Gson.java:1262)\n\tat com.google.gson.Gson.fromJson(Gson.java:1171)\n\tat com.google.gson.Gson.fromJson(Gson.java:1137)\n\tat io.github.vrchatapi.JSON.deserialize(JSON.java:340)\n\tat io.github.vrchatapi.ApiClient.deserialize(ApiClient.java:851)\n\tat io.github.vrchatapi.ApiClient.handleResponse(ApiClient.java:1061)\n\tat io.github.vrchatapi.ApiClient.execute(ApiClient.java:985)\n\tat io.github.vrchatapi.api.GroupsApi.getGroupWithHttpInfo(GroupsApi.java:2606)\n\tat io.github.vrchatapi.api.GroupsApi.getGroup(GroupsApi.java:2584)\n```\n\nLooking 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\n\nand the raw response from the server looks like this:\n```json\n{\n\"roleIdsToView\": null,\n}\n```\n\nInspecting the generated code and setting a breakpoint leads me to this generated code snippet:\n```java\n      // ensure the optional json data is an array if present\n      if (jsonObj.get(\"roleIdsToView\") != null \u0026\u0026 !jsonObj.get(\"roleIdsToView\").isJsonArray()) {\n        throw new IllegalArgumentException(String.format(\"Expected the field `roleIdsToView` to be an array in the JSON string but got `%s`\", jsonObj.get(\"roleIdsToView\").toString()));\n      }\n```\n\nSetting a breakpoint on the throw line reveals that jsonObj.get(\"roleIdsToView\") is not set to null, but to JsonNull:\n\u003cimg width=\"1469\" height=\"651\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/f98f9324-dc35-4ad4-a8a5-beaeae51555a\" /\u003e\n\ncausing 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?","author":{"url":"https://github.com/unshowered","@type":"Person","name":"unshowered"},"datePublished":"2025-09-03T04:29:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/7/vrchatapi-java/issues/7"}