Gradle 9.x: recipes for new 9.1–9.6 deprecations

[timtebeek]

Background

Gradle 9.x has introduced a number of new deprecations across minor releases (9.1–9.6), documented in the Gradle 9.6 upgrade guide. Several of these are mechanical DSL/API rewrites that are good candidates for OpenRewrite recipes and could be added to org.openrewrite.gradle.MigrateToGradle9.

This issue tracks candidate recipes for the new 9.2–9.6 deprecations.

Already covered in MigrateToGradle9

• 9.1 multi-string / map dependency notation → DependencyUseStringNotation
• 9.1 one declaration per statement → gradle9.OneDependencyDeclarationPerStatement
• JavaPluginConvention removal (top-level sourceCompatibility/targetCompatibility) → gradle9.UseJavaExtensionBlock
• mainClassName → mainClass → gradle9.UseMainClassProperty(ForApplication)
• version = { } → closure form → gradle9.UseVersionClosure
• spread *configurations.all → gradle9.RewriteSpreadAllInConfigurationsBlock

New recipe candidates (mechanical, good fit)

High value:

• Current-project dependency: module coordinates → project(":x") (9.3) — replace group:name:version referring to the current project with project() notation — gradle9.UseProjectDependencyInsteadOfModuleCoordinates (Gradle 9: recipes for findAll→matching (9.4) and current-project project() notation (9.3) #7989)
• Project object as dependency notation → project(":x") (9.6)
• DomainObjectCollection.findAll(Closure) → matching(Spec) (9.4) — gradle9.UseMatchingInsteadOfFindAll (Gradle 9: recipes for findAll→matching (9.4) and current-project project() notation (9.3) #7989)
• RepositoryHandler.flatDir(Map) / mavenCentral(Map) → action form (9.6)

Simple removals / renames:

• Dependencies.getProject() → project() (no-arg) (9.4)
• apply false in precompiled script plugins → remove (9.4)
• .version(...) in precompiled settings script plugins → remove (9.4)
• PMD targetJdk property → remove (9.6)
• JavaForkOptions.setAllJvmArgs() → setJvmArgs() / jvmArgs() (9.1)
• Wrapper.getAvailableDistributionTypes() → Wrapper.DistributionType.values() (9.3)
• ReportingExtension.file(String) → getBaseDirectory().file(...) (9.1)
• CreateStartScripts.exitEnvironmentVar → remove (9.5)
• Configuration.getTaskDependencyFromProjectDependency() → remove (9.6)
• Kotlin DSL by registering / by extra → explicit register(...) (9.6, needs Kotlin DSL support)

Likely not worth a recipe (semantic / config-order / no clean target)

• Implicit parent-project property lookup & Project.getProperties() → providers.gradleProperty(...) (9.6) — needs data-flow analysis; changes laziness semantics
• Task action accessing dependencies/extensions/injected services at execution time (9.6)
• registerFeature before Java plugin applied / publishing unpublished projects (9.2/9.3)
• buildNeeded / buildDependents / IDE file-generation tasks removal (9.6)
• Develocity plugin pre-4.0 (version bump; covered by plugin-upgrade recipes)