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[Backport maven-4.0.x] Fix #2520: default maven.mainClass in Java instead of classworlds config - #12889
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…fig (#12875) Move the main class defaulting from classworlds property resolution to Java code. MavenCling is now hardcoded as the entry point in m2.conf and delegates to the class specified by -Dmaven.mainClass via reflection when set. This fixes the Maven Wrapper and IDE integration by removing the dependency on classworlds resolving ${maven.mainClass}. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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Clean cherry-pick of already-approved #12875 to maven-4.0.x. The diff is byte-for-byte identical to the original, all delegation targets (MavenEncCling, MavenShellCling, MavenUpCling) exist on 4.0.x with the correct public static int main(String[], ClassWorld) signatures, and CI is fully green across all platforms and JDK versions.
The reflection-based delegation in delegateMain is correct: it uses the context class loader (appropriate for classworlds), properly unwraps InvocationTargetException, and re-throws IOException/RuntimeException/Error without wrapping.
✅ LGTM — two minor style observations (not blocking):
MavenCling.javalines 79-87:instanceofchecks use old-style casts rather than pattern matching (if (cause instanceof IOException ioe)) which is used elsewhere in the codebase. Same observation from the original PR review.MavenClingTest.javaline 107:assertEquals(true, DelegateTarget.invoked)could beassertTrue(DelegateTarget.invoked).
This review was generated by an AI agent and may contain inaccuracies. Please verify all suggestions before applying.
Claude Code on behalf of Guillaume Nodet
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Summary
Backport of #12875 to
maven-4.0.x.Fixes Maven Wrapper and IDE compatibility broken with Maven 4.0.0-beta-5+ because
maven.mainClassis not set when launching through external tools.Changes:
m2.conf: Hardcodemain is org.apache.maven.cling.MavenCling from plexus.core— no variable resolution neededMavenCling.java: Checkmaven.mainClasssystem property and delegate to the specified class via reflection when setMavenClingTest.javawith delegation testsCherry-picked cleanly from a8be2cb.