Kafka Learning Projects

A collection of Kafka-based projects for learning and studying Apache Kafka patterns, architecture, and best practices.

Projects

1. kafka-banking-events

A Spring Boot application demonstrating Kafka usage for banking event processing:

• Payment event production and consumption
• Event-driven architecture
• Kafka topic management
• Docker Compose setup for local development

Quick Start

cd kafka-banking-events
docker-compose up
mvn spring-boot:run

2. kafka-order-notification

A Spring Boot application for learning end-to-end Kafka event publishing and consuming:

• REST API to create orders and trigger Kafka events
• Order event production and consumption patterns
• JSON serialization/deserialization with Spring Kafka
• Topic creation via Spring configuration
• Observing delivery metadata (partition and offset)
• Error handling and logging

Quick Start

cd kafka-order-notification
docker-compose up
./mvnw spring-boot:run

Create an order:

curl -X POST http://localhost:8080/orders \
  -H 'Content-Type: application/json' \
  -d '{"customerId":"CUST-1","productName":"PENCIL","amount":12.50}'

3. DB-level-kafka-order-notification

An advanced Spring Boot application extending kafka-order-notification with database-level event processing:

• Database-level order persistence with JPA/Hibernate
• Idempotency checks to prevent duplicate order processing
• Event deduplication using processed event store
• Order notifications service for order status tracking
• Kafka consumer with automatic offset reset
• Error handling and transactional guarantees
• Docker Compose setup with database support

Quick Start

cd DB-level-kafka-order-notification
docker-compose up
./mvnw spring-boot:run

Create an order:

curl -X POST http://localhost:8080/orders \
  -H 'Content-Type: application/json' \
  -d '{"customerId":"CUST-1","productName":"PENCIL","amount":12.50}'

Getting Started

Each project folder contains its own setup instructions and documentation.

Technologies Used

• Apache Kafka
• Spring Boot
• Docker & Docker Compose
• Maven