plugins {
    id 'org.springframework.boot' version '2.3.3.RELEASE'
    id 'io.spring.dependency-management' version '1.0.8.RELEASE'
    id 'java'
}

group 'org.example'
version '1.0-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    mavenCentral()
}

def defaultEncoding = 'UTF-8'
tasks.withType(AbstractCompile) each { it.options.encoding = defaultEncoding }

compileTestJava {
    options.encoding = defaultEncoding
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }
}

test {
    useJUnitPlatform()
}

package org.example;

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

@SpringBootApplication
public class BootApp {

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

package org.example;

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

@RestController
public class Controller {

    @RequestMapping("/")
    public String index() {
        return "\nHello World!";
    }
}

$ curl http://localhost:8080/
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    13  100    13    0     0    149      0 --:--:-- --:--:-- --:--:--   149
Hello World!

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