Create Spring Boot Kotlin Project

Create Spring Boot Kotlin project prompt

• Please make sure you have the following software installed on your system:

• Java 21
• Docker
• Docker Compose

• If you need to custom the project name, please change the artifactId and the packageName in download-spring-boot-project-template

• If you need to update the Spring Boot version, please change the bootVersion in download-spring-boot-project-template

Check Java version

• Run following command in terminal and check the version of Java

java -version

Download Spring Boot project template

• Run following command in terminal to download a Spring Boot project template

curl https://start.spring.io/starter.zip \
  -d artifactId=${input:projectName:demo-kotlin} \
  -d bootVersion=3.4.5 \
  -d dependencies=configuration-processor,webflux,data-r2dbc,postgresql,data-redis-reactive,data-mongodb-reactive,validation,cache,testcontainers \
  -d javaVersion=21 \
  -d language=kotlin \
  -d packageName=com.example \
  -d packaging=jar \
  -d type=gradle-project-kotlin \
  -o starter.zip

Unzip the downloaded file

• Run following command in terminal to unzip the downloaded file

unzip starter.zip -d ./${input:projectName:demo-kotlin}

Remove the downloaded zip file

• Run following command in terminal to delete the downloaded zip file

rm -f starter.zip

Unzip the downloaded file

• Run following command in terminal to unzip the downloaded file

unzip starter.zip -d ./${input:projectName:demo-kotlin}

Add additional dependencies

• Insert springdoc-openapi-starter-webmvc-ui and archunit-junit5 dependency into build.gradle.kts file

```gradle.kts dependencies { implementation("org.springdoc:springdoc-openapi-starter-webflux-ui:2.8.6") testImplementation("com.tngtech.archunit:archunit-junit5:1.2.1") }

- Insert SpringDoc configurations into `application.properties` file

SpringDoc configurations

springdoc.swagger-ui.doc-expansion=none springdoc.swagger-ui.operations-sorter=alpha springdoc.swagger-ui.tags-sorter=alpha

- Insert Redis configurations into `application.properties` file

Redis configurations

spring.data.redis.host=localhost spring.data.redis.port=6379 spring.data.redis.password=rootroot

- Insert R2DBC configurations into `application.properties` file

R2DBC configurations

spring.r2dbc.url=r2dbc:postgresql://localhost:5432/postgres spring.r2dbc.username=postgres spring.r2dbc.password=rootroot

spring.sql.init.mode=always spring.sql.init.platform=postgres spring.sql.init.continue-on-error=true

- Insert MongoDB configurations into `application.properties` file

MongoDB configurations

spring.data.mongodb.host=localhost spring.data.mongodb.port=27017 spring.data.mongodb.authentication-database=admin spring.data.mongodb.username=root spring.data.mongodb.password=rootroot spring.data.mongodb.database=test

- Create `docker-compose.yaml` at project root and add following services: `redis:6`, `postgresql:17` and `mongo:8`.

  - redis service should have
    - password `rootroot`
    - mapping port 6379 to 6379
    - mounting volume `./redis_data` to `/data`
  - postgresql service should have
    - password `rootroot`
    - mapping port 5432 to 5432
    - mounting volume `./postgres_data` to `/var/lib/postgresql/data`
  - mongo service should have
    - initdb root username `root`
    - initdb root password `rootroot`
    - mapping port 27017 to 27017
    - mounting volume `./mongo_data` to `/data/db`

- Insert `redis_data`, `postgres_data` and `mongo_data` directories in `.gitignore` file

- Run gradle clean test command to check if the project is working

./gradlew clean test

- (Optional) `docker-compose up -d` to start the services, `./gradlew spring-boot:run` to run the Spring Boot project, `docker-compose rm -sf` to stop the services.

Let's do this step by step.