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Add @Nullable to a mismatched generic type argument

Recipe IDio.moderne.nullability.AddNullableToMismatchedTypeArgument
Artifactio.moderne.recipe:rewrite-nullability

Adds @Nullable to a nested generic type argument when a variable initializer or return has a wider nested element nullness than its target (such as a List<@Nullable String> assigned into a List<String>) by adding @Nullable to the target's nested type argument. A generic container is invariant in its element nullness, so the mismatch is a NullAway error. Gated on JSpecify @NullMarked scope and applied only where the fix is local to a declaration this recipe owns (a variable initializer or a method return type); raw types, unresolved bases, arity mismatches, and the diamond new B<>() target are left unchanged. Idempotent.

Single recipeProprietary

Usage

This recipe has no required configuration options. You’ll need the Moderne CLI configured before running the command below.

mod run . --recipe io.moderne.nullability.AddNullableToMismatchedTypeArgument

If the recipe isn’t available locally, install it with:

mod config recipes jar install io.moderne.recipe:rewrite-nullability:0.3.1

Data tables

Structured output this recipe can produce.

  • Source files that had resultsSource files that were modified by the recipe run.org.openrewrite.table.SourcesFileResults
  • Source files that had search resultsSearch results that were found during the recipe run.org.openrewrite.table.SearchResults
  • Source files that errored on a recipeThe details of all errors produced by a recipe run.org.openrewrite.table.SourcesFileErrors
  • Recipe performanceStatistics used in analyzing the performance of recipes.org.openrewrite.table.RecipeRunStats