解决idea 中 SpringBoot 点击运行没反应按钮成灰色的问题

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

# application.properties
logging.level.root=info
logging.file.name=myapp.log

# application.yml
logging:
  level: root
  file: myapp.log

mvn clean install -U

gradle clean build --refresh-dependencies -DincludeScope=compile -U

# application.properties
server.port=8080

# application.yml
server:
  port: 8080

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class MyController {
    @Value("${server.port}")
    private String port;
    @GetMapping("/port")
    public String getPort() {
        return port;
    }
}
```@[TOC](这里写自定义目录标题)