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DataFetchingEnvironment getDataLoader doesn't match DataLoader signature #4179
Description
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'
Activity
github-actions commentedon Jan 25, 2026
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.
github-actions commentedon Feb 24, 2026
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.
github-actions commentedon Apr 26, 2026
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.
dondonz commentedon Apr 27, 2026
Adding keep open - this should be fixed
bbakerman commentedon Jun 4, 2026
I think this is fixed
28e1e7a
#4180
I am going to close this