Building an Order Processing Pipeline with Spring Integration (HTTP + File Polling)

Short summary

A practical tutorial for building an order-processing pipeline using Spring Integration, handling multiple input sources (HTTP POST and CSV file polling). The sample app demonstrates message-driven architecture with Spring Boot 4.1, Spring Integration 7, PostgreSQL, and includes 38 tests covering transformation, validation, routing, and fan-out patterns. Runnable code and best practices included for correlation tracking, configuration organization, and stateful aggregation.

• •Demonstrates message-driven order processing with Spring Integration across HTTP and file inputs
• •Includes production patterns: validation, routing, persistence, error handling, and observability
• •Complete runnable example with 38 tests and deployment via Docker/Maven

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