Game Platform Server (Spring Boot WebFlux + MyBatis + MySQL)

A minimal backend scaffold using Spring Boot 3, WebFlux, MyBatis, and MySQL. Includes a sample User CRUD implemented via MyBatis (blocking JDBC) safely wrapped in reactive APIs.

Tech Stack

• Spring Boot 3 (WebFlux, Actuator)
• MyBatis Spring Boot Starter (JDBC)
• MySQL Connector/J
• Java 17

Blocking JDBC with WebFlux

MyBatis uses JDBC which is blocking. To keep WebFlux event loop non-blocking, all data access is offloaded to Schedulers.boundedElastic() (see UserService). This is a common and safe pattern when you need WebFlux endpoints but must use JDBC/MyBatis.

Project Layout

• pom.xml – Maven build, dependencies
• src/main/resources/application.yml – datasource + mybatis config
• src/main/resources/mapper/*.xml – MyBatis mappers (XML)
• src/main/resources/schema.sql – initial table
• src/main/java/com/gameplatform/server – application code

Configure Database

1. Create database:

   CREATE DATABASE game_platform CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
   

2. Update spring.datasource.* in application.yml with your MySQL credentials.
3. Run the SQL init:

   USE game_platform;
   -- then execute contents of src/main/resources/schema.sql
   

Build & Run

Requires JDK 17+ and Maven 3.9+.

mvn spring-boot:run

The app starts on http://localhost:8080.

Endpoints

• GET /actuator/health – health check
• GET /api/users – list users
• GET /api/users/{id} – get user by id
• POST /api/users – create user
  • body:

    {"username": "alice", "email": "alice@example.com"}
    

• DELETE /api/users/{id} – delete user

Notes

• If you need true end-to-end reactive IO, consider R2DBC instead of JDBC/MyBatis. Here we keep MyBatis for mapping convenience and use bounded elastic threads to avoid blocking the event loop.