Hello world

src/main/java/com/example/demo/DemoApplication.java

@@ -2,12 +2,18 @@ package com.example.demo;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
 
+@RestController
 @SpringBootApplication
 public class DemoApplication {
 
 	public static void main(String[] args) {
 		SpringApplication.run(DemoApplication.class, args);
 	}
-
+	@GetMapping(value="/")
+   public String HelloWorld(){
+      return "Hello World";
 }
+}
\ No newline at end of file

src/main/resources/application.properties

 spring.application.name=demo
+server.port = 3000
\ No newline at end of file