How to run main class packed in springboot jar

Question

My project uses springboot, after pack it to jar file, I can execute java -jar my-project.jar to run the instance.

I also have a script which is a main class, when I execute java -cp my-project.jar com.test.MyScript, it says Could not find or load main class.

How can this happen? By the way, when I execute java -cp my-project.jar com.test.MyApplication, the same error occurs. MyApplication is the SpringBootApplication class.

Why can't I manually run the main class?

Correct alternative can be found here https://stackoverflow.com/a/61601687/3805988 — Ram, Jul 29 '20 at 23:58

score 1 · Answer 1 · answered Apr 17 '18 at 05:53

1

That is because spring boot doesn't use the SpringBootApplication as the main entry point. It uses org.springframework.boot.loader.Launcher.

Excerpt from the spring docs:

The org.springframework.boot.loader.Launcher class is a special bootstrap class that is used as an executable jar’s main entry point. It is the actual Main-Class in your jar file, and it is used to setup an appropriate URLClassLoader and ultimately call your main() method.

answered Apr 17 '18 at 05:53

Yogesh Badke

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may I add my script main class as the param of `Launcher` to run my script? – xuanzhui Apr 17 '18 at 06:25
May be this can help: https://stackoverflow.com/questions/3976514/multiple-runnable-classes-inside-jar-how-to-run-them – Yogesh Badke Apr 17 '18 at 09:21
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Try this, worked for me https://stackoverflow.com/a/61601687/3805988 – Ram Jul 29 '20 at 23:59

How to run main class packed in springboot jar

1 Answers1