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Add @NullMarked to package-info.java for an allowlist of packages

io.moderne.nullability.scope.AddNullMarkedToPackageInfo

Adds the JSpecify @NullMarked annotation to the package-info.java of an explicit allowlist of packages, for a controlled, package-at-a-time rollout toward NullAway. The allowlist supports exact package names and a trailing .* prefix wildcard; an empty allowlist is a no-op for safety. When generateMissing is enabled, an allowlisted package that has Java sources but no package-info.java gets one generated with @NullMarked. Idempotent and never double-marks. Only Java sources are considered. Pair with AddNullMarkedToCleanPackages for automatic gating.

Recipe source​

This recipe is only available to users of Moderne.

This recipe is available under the Moderne Proprietary License.

Options​

TypeNameDescriptionExample
ListpackagesThe explicit allowlist of packages to null-mark. Each entry is either an exact package name (for example com.airbnb.payments) or a trailing .* prefix wildcard (for example com.airbnb.payments.*, which matches that package and every sub-package). If empty, the recipe is a no-op for safety.com.airbnb.payments.*
BooleangenerateMissingOptional. When true, for an allowlisted package that has at least one Java source but no package-info.java, generate one containing @NullMarked. Defaults to false.

Example​

Before​
src/main/java/com/airbnb/payments/package-info.java
package com.airbnb.payments;
After​
src/main/java/com/airbnb/payments/package-info.java
@NullMarked
package com.airbnb.payments;

import org.jspecify.annotations.NullMarked;

Usage​

This recipe has required configuration parameters and can only be run by users of Moderne. To run this recipe, you will need to provide the Moderne CLI run command with the required options. Or, if you'd like to create a declarative recipe, please see the below example of a rewrite.yml file:

rewrite.yml
---
type: specs.openrewrite.org/v1beta/recipe
name: com.yourorg.AddNullMarkedToPackageInfoExample
displayName: Add `@NullMarked` to `package-info.java` for an allowlist of packages example
recipeList:
  - io.moderne.nullability.scope.AddNullMarkedToPackageInfo:
      packages:
        - com.airbnb.payments.*

You will need to have configured the Moderne CLI on your machine before you can run the following command.

shell
mod run . --recipe AddNullMarkedToPackageInfo --recipe-option "packages=com.airbnb.payments.*"

If the recipe is not available locally, then you can install it using:

mod config recipes jar install io.moderne.recipe:rewrite-nullability:0.1.0

See how this recipe works across multiple open-source repositories​

Run this recipe on OSS repos at scale with the Moderne SaaS.

The community edition of the Moderne platform enables you to easily run recipes across thousands of open-source repositories.

Please contact Moderne for more information about safely running the recipes on your own codebase in a private SaaS.

Data Tables​

Source files that had results​

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column NameDescription
Source path before the runThe source path of the file before the run. null when a source file was created during the run.
Source path after the runA recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Parent of the recipe that made changesIn a hierarchical recipe, the parent of the recipe that made a change. Empty if this is the root of a hierarchy or if the recipe is not hierarchical at all.
Recipe that made changesThe specific recipe that made a change.
Estimated time savingAn estimated effort that a developer to fix manually instead of using this recipe, in unit of seconds.
CycleThe recipe cycle in which the change was made.