Description

ctbarbour

opened on Nov 25, 2025

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Describe the bug

DataFetchingEnvironment.getDataLoader<K, V>() has type parameters that are implicitly non-null due to @NullMarked but DataLoader<K, V extends @Nullable Object> 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.

To Reproduce

From Kotlin, attempt to get a DataLoader with a nullable value type:

// Kotlin sees getDataLoader as requiring V : Any
val loader: DataLoader<String, Player?>? = env.getDataLoader("PlayerLoader")
// Error: Type argument is not within its bounds: must be subtype of 'Any'

Reacted by Francesco Vasco

Activity

1. github-actions commented on Jan 25, 2026

   

   github-actionsBot

   on Jan 25, 2026 – with GitHub Actions

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   Hello, this issue has been inactive for 60 days, so we're marking it as stale. If you would like to continue this discussion, please comment within the next 30 days or we'll close the issue.
2. github-actions

   added

   Stale

   on Jan 25, 2026
3. github-actions commented on Feb 24, 2026

   

   github-actionsBot

   on Feb 24, 2026 – with GitHub Actions

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   Hello, as this issue has been inactive for 90 days, we're closing the issue. If you would like to resume the discussion, please create a new issue.
4. github-actions

   closed this as not plannedon Feb 24, 2026
5. andimarek

   reopened this on Feb 24, 2026
6. github-actions

   removed

   Stale

   on Feb 25, 2026
7. github-actions commented on Apr 26, 2026

   

   github-actionsBot

   on Apr 26, 2026 – with GitHub Actions

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   Hello, this issue has been inactive for 60 days, so we're marking it as stale. If you would like to continue this discussion, please comment within the next 30 days or we'll close the issue.
8. github-actions

   added

   Stale

   on Apr 26, 2026
9. dondonz

   added

   keep-openTells Stale Bot to keep PRs and issues openTells Stale Bot to keep PRs and issues open

   and removed

   Stale

   on Apr 27, 2026
10. dondonz commented on Apr 27, 2026

    

    dondonz

    on Apr 27, 2026

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    Adding keep open - this should be fixed
11. bbakerman commented on Jun 4, 2026

    

    bbakerman

    on Jun 4, 2026

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    I think this is fixed

    28e1e7a

    #4180

    I am going to close this
12. bbakerman

    closed this as completedon Jun 4, 2026

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