Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 7“Production-grade backends”

First Application

Let's build, run and hit your first Spring Boot endpoint.

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Focus

3 guided sections

Practice signal

Examples included

Career prep

Foundation builder

Introduction

Let's build, run and hit your first Spring Boot endpoint. This is the smallest production-shaped app: REST, JSON, validation, dependency injection.

Syntax reference

Run it:

bash

# Maven
./mvnw spring-boot:run

# or
./mvnw -q -DskipTests package
java -jar target/orders-0.0.1-SNAPSHOT.jar

# Hit it
curl http://localhost:8080/api/orders/42
# → {"id":42,"status":"Pending","amountCents":4999}

Informative example

OrdersApplication.java — entry point + a controller:

package com.acme.orders;

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

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

@RestController
@RequestMapping("/api/orders")
class OrderController {
  @GetMapping("/{id}")
  public OrderResponse getOne(@PathVariable Long id) {
    return new OrderResponse(id, "Pending", 4999);
  }
}

record OrderResponse(Long id, String status, int amountCents) {}

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