Fix maven.mainClass property missing for external tools #10998
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Fixes apache#10996 When external tools like IntelliJ launch Maven directly using the ClassWorlds launcher without setting the maven.mainClass system property, Maven fails with 'No such property: maven.mainClass'. This change adds a default value for maven.mainClass in m2.conf so that external tools can launch Maven without needing to know about this property. The default value is org.apache.maven.cling.MavenCling which is the standard Maven CLI entry point. The fix maintains backward compatibility - Maven launcher scripts continue to work normally by setting the property explicitly, while external tools now have a sensible default.
elharo
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gnodet
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Fixes apache#10996 When external tools like IntelliJ launch Maven directly using the ClassWorlds launcher without setting the maven.mainClass system property, Maven fails with 'No such property: maven.mainClass'. This change adds a default value for maven.mainClass in m2.conf so that external tools can launch Maven without needing to know about this property. The default value is org.apache.maven.cling.MavenCling which is the standard Maven CLI entry point. The fix maintains backward compatibility - Maven launcher scripts continue to work normally by setting the property explicitly, while external tools now have a sensible default. (cherry picked from commit 4e50e95)
gnodet
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) Fixes #10996 When external tools like IntelliJ launch Maven directly using the ClassWorlds launcher without setting the maven.mainClass system property, Maven fails with 'No such property: maven.mainClass'. This change adds a default value for maven.mainClass in m2.conf so that external tools can launch Maven without needing to know about this property. The default value is org.apache.maven.cling.MavenCling which is the standard Maven CLI entry point. The fix maintains backward compatibility - Maven launcher scripts continue to work normally by setting the property explicitly, while external tools now have a sensible default. (cherry picked from commit 4e50e95)
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Fixes #10996
When external tools like IntelliJ launch Maven directly using the ClassWorlds launcher without setting the
maven.mainClasssystem property, Maven fails with:Root Cause
The m2.conf file was changed to use
${maven.mainClass}but this property is only set by the Maven launcher scripts (mvnandmvn.cmd). External tools that launch Maven directly don't set this property.Solution
This change adds a default value for
maven.mainClassin m2.conf:How it works
-Dmaven.mainClass=org.apache.maven.cling.MavenCling(or other variants for--enc,--shell,--up)org.apache.maven.cling.MavenClingis the standard Maven CLI entry pointImpact
mvnscriptsmaven.mainClasspropertyThe solution uses the same ClassWorlds configuration syntax already used elsewhere in the m2.conf file (
set maven.conf default ${maven.home}/conf).Pull Request opened by Augment Code with guidance from the PR author