Integration Patterns

Integration work in Java is mostly about boundaries: how messages are shaped, routed, transformed, retried, and observed as they move between applications and services.

Use this chapter to decide which integration responsibilities belong in application code, which belong in integration frameworks, and how to keep messaging flows understandable as the system grows.

In this section

• Enterprise Integration Patterns in Java
  Understand how channels, routers, transformers, and endpoints structure Java systems that connect heterogeneous applications and services.
• Java Message Channel Patterns for Delivery Boundaries
  Choose point-to-point, publish-subscribe, and dead-letter channels for Java messaging systems with clearer delivery and failure behavior.
• Java Message Routing Patterns for Integration Flows
  Choose content-based routers, filters, dynamic routers, and resequencers that keep Java integration routing explicit as destinations and rules grow.
• Java Message Transformation Patterns for Schema Boundaries
  Transform, enrich, and normalize Java messages so connected systems can exchange data without sharing identical schemas.
• Java Aggregation and Splitting Patterns for Messages
  Use splitters, aggregators, and resequencers to break apart, recombine, and reorder messages in Java integration flows.
• Java Message Endpoint Patterns for Integration Boundaries
  Use service activators and messaging gateways to connect Java application code to asynchronous messaging systems without leaking transport concerns.
• Java Microservices Integration Patterns for Service Boundaries
  Choose API gateways, service discovery, circuit breakers, sagas, and event-driven consistency patterns for Java microservice boundaries.
• Java Spring Integration Flows for Messaging Systems
  Build Java integration flows with Spring Integration using channels, endpoints, EIP components, and operational testing practices.