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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"DataFetchingEnvironment getDataLoader doesn't match DataLoader signature","articleBody":"**Describe the bug**\n\n[`DataFetchingEnvironment.getDataLoader\u003cK, V\u003e()`](https://github.com/graphql-java/graphql-java/blob/ed0791c75c681aa4cc750ca7a359bdb32225c1bd/src/main/java/graphql/schema/DataFetchingEnvironment.java#L241) has type parameters that are implicitly non-null due to [`@NullMarked`](https://github.com/graphql-java/graphql-java/blob/ed0791c75c681aa4cc750ca7a359bdb32225c1bd/src/main/java/graphql/schema/DataFetchingEnvironment.java#L31) but [`DataLoader\u003cK, V extends @Nullable Object\u003e`](https://github.com/graphql-java/java-dataloader/blob/918203c03acb041426171ae8dc672d88174747dd/src/main/java/org/dataloader/DataLoader.java#L72) explicitly allows nullable V. This creates a type mismatch when calling from Kotlin. As of Kotlin 2.1.0, Kotlin compiler treats JSpecify types as null-safe types. \n\n**To Reproduce**\n\nFrom Kotlin, attempt to get a DataLoader with a nullable value type:\n\n```kotlin\n// Kotlin sees getDataLoader as requiring V : Any\nval loader: DataLoader\u003cString, Player?\u003e? = env.getDataLoader(\"PlayerLoader\")\n// Error: Type argument is not within its bounds: must be subtype of 'Any'\n```\n\n","author":{"url":"https://github.com/ctbarbour","@type":"Person","name":"ctbarbour"},"datePublished":"2025-11-25T21:33:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/4179/graphql-java/issues/4179"}