spring boot： o.s.b.d.LoggingFailure错误

Question

想实现输入http://localhost:8080/sayhello?name=自己名字，然后在网页上跳出名字
我的project：

运行DemoApplication时候报错还有一个warning：

DemoApplication:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@SpringBootApplication
public class DemoApplication {
    @RequestMapping("/hello")
    public String first(){
        return "hello!Stephen!";
    }
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

另外DemoApplication默认情况下也报错：

Answer 1

端口被占用了，你换个端口就行了