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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"DataFetcherResult.newResult\u003cT>() type parameter missing @Nullable bound for Kotlin JSpecify interop","articleBody":"**Describe the bug**\n\n`DataFetcherResult\u003cT extends @Nullable Object>` and `Builder\u003cT extends @Nullable Object>` correctly allow nullable T. However, the no-arg factory method still declares `\u003cT>` without the `@Nullable` bound:\n\n```java\npublic static \u003cT> Builder\u003cT> newResult() {\n    return new Builder\u003c>();\n}\n```\n\nUnder `@NullMarked`, Kotlin 2.1+ infers `T : Any`, making `DataFetcherResult.newResult\u003cMyType?>()` a compile error.\n\nThis is the same class of issue as #4179 (`getDataLoader` type bounds, fixed in #4180), but for `DataFetcherResult`.\n\n**To Reproduce**\n\n```kotlin\n// graphql-java 25.0, Kotlin 2.3+\n// Compile error: Type argument is not within its bounds: must be subtype of 'Any'\nval result = DataFetcherResult.newResult\u003cString?>()\n    .data(null)\n    .build()\n```\n\n**Expected behavior**\n\nThe above should compile. Fix:\n\n```java\n- public static \u003cT> Builder\u003cT> newResult()\n+ public static \u003cT extends @Nullable Object> Builder\u003cT> newResult()\n```\n\n**Note**: A fix already exists on branch `claude/kotlin-jspecify-e2e-test-rdaLf` (commit `f8f06a25`, Mar 8 2026) but has no associated PR.\n\n**Versions**: graphql-java 25.0, Kotlin 2.3.20","author":{"url":"https://github.com/mrmegapolys","@type":"Person","name":"mrmegapolys"},"datePublished":"2026-04-02T14:12:47Z","url":"https://github.com/graphql-java/graphql-java/issues/4364"}