Broken with OpenJDK 24 (gradle 9.x snapshots)

[theoparis]

See gradle/gradle#32597

[error] FAILURE: Build failed with an exception.

* What went wrong:
Resolution of the configuration ':brigadier:annotationProcessor' was attempted without an exclusive lock. This is unsafe and not allowed.

The project builds fine from the command line (with JAVA_HOME set to Java 24), so I assume it is an issue with this extension, or maybe eclipse jdtls.

[einarjohnson]

did you ever figure this one out? having the same issue

[PyvesB]

Worth noting that this is not specific to Java 24 nor to Gradle snapshots. The issue remains on Java 25 and 26, as well as stable Gradle 9 releases.

I managed to work around the issue by adding the following Gradle init file with Claude's help (~/.gradle/init.d/ide-import-compat.init.gradle.kts):

import org.gradle.api.internal.project.ProjectInternal

// Gradle 9.x requires an exclusive project lock to resolve any configuration.
// When the Gradle Build Server fetches the IDE model via a BuildAction, it resolves
// all resolvable configurations (annotationProcessor, checkstyle, compileClasspath, …)
// without holding individual sub-project locks, causing:
//   "Resolution of the configuration '...' was attempted without an exclusive lock."
//
// Fix: pre-resolve ALL resolvable configurations in gradle.projectsEvaluated, which fires
// after ALL afterEvaluate callbacks complete. We acquire each project's lock explicitly via
// applyToMutableState so hasMutableState() is true during resolution.
// DefaultConfiguration.resolveGraphIfRequired() then short-circuits on the cached result
// before the hasMutableState() check when the GBS model builder runs.
if (gradle.startParameter.taskNames.isEmpty()) {
    gradle.projectsEvaluated {
        rootProject.allprojects {
            val projectOwner = (this as ProjectInternal).owner
            configurations
                .filter { it.isCanBeResolved }
                .forEach { config ->
                    projectOwner.applyToMutableState { _ ->
                        try {
                            config.resolve()
                        } catch (_: Exception) {
                            // Ignore — best-effort pre-resolution; IDE import takes priority.
                        }
                    }
                }
        }
    }
}