This is a Reactive Spring Boot web service for managing client data and resolving bank names by credit card numbers. The service uses MongoDB for data persistence and supports high-throughput asynchronous operations.

• CRUD operations for clients
• Lookup of banks for specific credit card IDs
• Reactive stack (WebFlux + Reactive MongoDB)
• Docker & Docker Compose ready
• Collection filtering happens on MongoDb Side by generic repository customization.
• Primary data validation presents using Jakarta Validation.
• Errors handling:
  • 404 (Not Found) Error thrown if a client not found
  • 400 (Bad Request) Error thrown if a client already exists (by name) or the request is not valid.
• Used MapStruct for DTO <-> Models mapping.
• Used Smart tests approach - if no Mongo present, the tests depends on it will be skipped to allow normal build anytime

Base URL: http://localhost:8080/clients

curl -X POST http://localhost:8080/clients \
  -H "Content-Type: application/json" \
  -d '{
        "name": "John Doe",
        "creditCardIds": ["1111222233334444", "5555666677778888"]
      }'

curl -X PUT http://localhost:8080/clients/<id> \
  -H "Content-Type: application/json" \
  -d '{
        "name": "Updated Name",
        "creditCardIds": ["cc1", "cc3"]
      }'

curl http://localhost:8080/clients

curl http://localhost:8080/clients/<id>

curl -X DELETE http://localhost:8080/clients/<id>

curl -X POST http://localhost:8080/clients/bank-names \
  -H "Content-Type: application/json" \
  -d '{
        "personIds": ["<clientId1>", "<clientId2>"],
        "creditCardIds": ["1111222233334444", "cc1"]
      }'

• Java 17
• Gradle
• Docker & Docker Compose

./gradlew clean build

docker-compose up --build
docker-compose up -d
docker-compose down

The app will be available at:
📍 http://localhost:8080/clients

{
  "_id": "abc123",
  "name": "Alice",
  "creditCardIds": ["cc1", "cc2", "cc3"]
}

The app uses the following environment variables (loaded via .env):

MONGO_IMAGE=docker.io/library/mongo:latest
MONGO_PORT=27017
APP_PORT=8080
MONGO_DB_NAME=clients_db
MONGO_URI=mongodb://mongo:${MONGO_PORT}/${MONGO_DB_NAME}

• Add tests and monitor test coverage.
• Replace Smart tests with TestContainers usage.