Package private Main class using Java 25 is not found by build plugins

I am working on a demo with Java 25 where you can define your main method as package private, i.e.

@SpringBootApplication
public class DemoApplication {

	static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}

}

Trying to run or package the app leads to:

* What went wrong:
Execution failed for task ':bootJar'.
> Error while evaluating property 'mainClass' of task ':bootJar'.
   > Failed to calculate the value of task ':bootJar' property 'mainClass'.
      > Main class name has not been configured and it could not be resolved from classpath /Users/snicoll/workspace/demo/matchmaking/playerprofile/build/classes/java/main:/Users/snicoll/workspace/demo/matchmaking/playerprofile/build/resources/main

It looks like the algorithm should be relaxed now that the main method does not need to be public (at least on Java 25+)

We can't make those package private just yet

Add support for finding package-private and parameterless main

Java 25 also allows this:

public class SDMStoreApplication {

    void main() {
        SpringApplication.run(SDMStoreApplication.class);
    }
}

But it's causing the same exception as in this post. Can anyone please amend the spring-boot-loader-tools to remove the requirement on the main() method to be static? The issue seems to stem form here:

See #35785

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Package private Main class using Java 25 is not found by build plugins #47309

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Package private Main class using Java 25 is not found by build plugins #47309

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mihaiapostol1995 commented on Jan 9, 2026

snicoll commented on Jan 9, 2026

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