Test Spring Boot 3 with Kotlin

Project Configuration

I create the Spring Boot project using IntelliJ IDEA.

You can use the Spring Initializr with the same configuration.

Project Structures

Code Configuration

Dependencies

Please add this validation dependency to your build.gradle.kts file.

implementation("org.springframework.boot:spring-boot-starter-validation")

Application Properties

Please change this configuration to your application.properties file.

# Spring DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
spring.datasource.url = jdbc:mysql://localhost:3306/kotlin_demo?allowPublicKeyRetrieval=true&autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false
spring.datasource.username = <- Change to your username
spring.datasource.password = <- Change to your password
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

# Hibernate Properties

# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.database-platform=org.hibernate.dialect.MySQL8Dialect

# Hibernate show SQL
spring.jpa.show-sql=true

# Hibernate naming strategy
spring.jpa.generate-ddl=true

# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto = update

Docker Configuration

Please change this configuration to your docker-compose.yml file.

version: '3.1'

services:
  mysql_db:
    image: mysql:8.3
    container_name: mysql_db
    restart: always
    environment:
      - MYSQL_ROOT_PASSWORD= <- Change to your password
      - MYSQL_DATABASE=kotlin_demo
      - MYSQL_USER= <- Change to your username
      - MYSQL_PASSWORD= <- Change to your password
    ports:
      - "3306:3306"

Run the Project

Run the Docker

Please run the docker-compose file using this command.

docker-compose up -d

Check if the database is running using DBeaver

Create a new connection using the following configuration:

Also set two properties in the Driver properties tab:

Click Test Connection to check if the connection is successful.

Run the Spring Boot Project

You can run the project by using IntelliJ IDEA or using the following command:

./gradlew bootRun

Test the API

You can test the API by using the collection in the postman folder.