Fix predeclare from buildscript in gradle 9.x#2929
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nedtwigg merged 3 commits intoMay 14, 2026
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Gradle 9 rejects mutating the root `buildscript` configuration container during task execution. This breaks `predeclareDepsFromBuildscript()` because Spotless resolved formatter dependencies by calling `ConfigurationContainer.create(...)` from `:spotlessInternalRegisterDependencies`. This commit makes spotless resolve the formatter dependencies with a detached configurations instead. They are not added to the target configuration container, so they avoid the Gradle 9 mutation guard while still using the repositories from the same configuration context. Also adds a Gradle 9.5.1 integration test for the legacy `predeclareDepsFromBuildscript()` path. https://docs.gradle.org/current/userguide/upgrading_version_8.html#mutating_buildscript_configurations https://docs.gradle.org/current/javadoc/org/gradle/api/artifacts/ConfigurationContainer.html#detachedConfiguration-org.gradle.api.artifacts.Dependency...- Fixes diffplug#2599
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Gradle 9 rejects mutating the root
buildscriptconfiguration container during task execution. This breakspredeclareDepsFromBuildscript()because Spotless resolved formatter dependencies by callingConfigurationContainer.create(...)from:spotlessInternalRegisterDependencies.This commit makes spotless resolve the formatter dependencies with a detached configurations instead.
They are not added to the target configuration container, so they avoid the Gradle 9 mutation guard while still using the repositories from the same configuration context.
Also adds a Gradle 9.5.1 integration test for the legacy
predeclareDepsFromBuildscript()path.https://docs.gradle.org/current/userguide/upgrading_version_8.html#mutating_buildscript_configurations
https://docs.gradle.org/current/javadoc/org/gradle/api/artifacts/ConfigurationContainer.html#detachedConfiguration-org.gradle.api.artifacts.Dependency...-
Fixes #2599