Moderne licensed

Add a `@Contract` nullness contract to a validation helper

Recipe IDio.moderne.nullability.AddNullnessContractToValidationHelperArtifactio.moderne.recipe:rewrite-nullability

Adds an org.jetbrains.annotations.@Contract annotation to a single-@Nullable-parameter helper method whose body provably encodes a nullness contract, so the checker can narrow at every call site without any runtime assertion. Three canonical body shapes are recognized: a boolean-returning method whose body is return arg != null && ...; (the argument's non-nullity is a required conjunct) becomes @Contract("null -> false"); a method that unconditionally throws — or delegates to requireNonNull / checkNotNull — when the argument is null becomes @Contract("null -> fail"); and an identity pass-through that returns the argument unchanged becomes @Contract("null -> null"). Only methods with exactly one parameter, a simple recognizable body, and no existing @Contract are annotated. The edit is annotation-only and behavior-preserving — runtime semantics are unchanged. Idempotent and conservative; only Java sources are modified.

Single recipeProprietary

Add to your build

Get a download tokenThis recipe is Moderne licensed, so the token must belong to a Moderne customer. It replaces YOUR_DOWNLOAD_TOKEN below.

~/.gradle/gradle.properties

codeGenomeUsername=you@example.com
codeGenomeToken=YOUR_DOWNLOAD_TOKEN

build.gradle.kts

plugins {
    id("org.openrewrite.rewrite") version("latest.release")
}

rewrite {
    activeRecipe("io.moderne.nullability.AddNullnessContractToValidationHelper")
}

repositories {
    mavenCentral()
    maven {
        url = uri("https://artifacts.codegenomeproject.org/maven")
        credentials {
            username = providers.gradleProperty("codeGenomeUsername").get()
            password = providers.gradleProperty("codeGenomeToken").get()
        }
    }
}

dependencies {
    rewrite("io.moderne.recipe:rewrite-nullability:0.6.0")
}

Then run

./gradlew rewriteRun

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.AddNullnessContractToValidationHelper

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

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

Options

Name	Type	Description
`annotatedPackages`	`String`	Comma-separated package prefixes to limit the fix to (matching NullAway's `AnnotatedPackages` option). When unset, the recipe fixes all packages. e.g. `com.example`

Data tables

Structured output this recipe can produce.

Null-safety fixes by rungEach residual null-safety fix applied, tagged with the precedence rung that produced it, so the share bottoming out at a last-resort `requireNonNull` assertion can be tracked.io.moderne.nullability.table.NullFixes
Declined null-safety fixes needing reviewEach site the recipe declined to auto-fix because the fix is a design decision (the value is explicitly `null` on some path, so the slot likely should be `@Nullable`), for human triage.io.moderne.nullability.table.DeclinedNullFixes
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