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Regression in Gradle plugin v8.3.0: Cannot set the value of task ':integTest:spotlessJava' property 'taskService' #2877
Description
See https://github.com/tbroyer/gradle-incap-helper/actions/runs/23116714774/job/67143450577?pr=53.
Caused by: java.lang.IllegalArgumentException: Cannot set the value of task ':integTest:spotlessJava' property 'taskService' of type com.diffplug.gradle.spotless.SpotlessTaskService loaded with InstrumentingVisitableURLClassLoader(ClassLoaderScopeIdentifier.Id{coreAndPlugins:settings[:]:buildSrc[:]:root-project[:]:project-integTest(export)}) using a provider of type com.diffplug.gradle.spotless.SpotlessTaskService loaded with InstrumentingVisitableURLClassLoader(ClassLoaderScopeIdentifier.Id{coreAndPlugins:settings[:]:buildSrc[:]:root-project[:]:project-incap(export)}).
This can be caused by a plugin being applied to two sibling projects and then using a shared build service. To fix this, use `@ServiceReference` or add the problematic plugin with `apply false` to the root build script.
This happens in a multi-project build where the root project doesn't have a build.gradle.kts, so the spotless plugin isn't applied on the root project; and indeed adding it with apply false works around the error.
Either this should be documented as a new requirement, or the plugin should use @ServiceReference (if that makes a difference; but then also require Gradle >= 8)
Reacted by Kyle Johnson, Artem Gorbounov, Sven Jacobs, Viacheslav Chernyshev, Daniel Soneira, Vedran Pavic, Antoine Belvire, Carl Mastrangelo, Kacper Martela and Patrick Lampe Dittmer
Activity
v-chernyshev commentedon Mar 16, 2026
We've also hit this bug in a project that does have a root-level
build.gradle.ktsthat applies some code coverage and static analysis plugins. Unfortunately, I can't share the logs as it's proprietary.Update Spotless to 8.4.0
schaarda commentedon Mar 25, 2026
We had the same error when we started using
org.gradle.configuration-cache=trueRemoved this and it worked again.
v-chernyshev commentedon Jun 26, 2026
Can this be looked into? We apply
spotlessas part of a shared binary java plugin that defines the necessary conventions. Forcing the users to also add it to their root build withapply falseis not ideal.