Java / Spring Boot Hello World

Create a Spring Boot application with a REST controller.

src/main/java/com/example/demo/HelloController.java:

package com.example.demo;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
public class HelloController {

    @GetMapping("/")
    public Map<String, String> hello() {
        return Map.of("message", "Hello World");
    }
}

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

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

Run it locally:

./mvnw spring-boot:run

curl http://localhost:8080
# {"message":"Hello World"}

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