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Microservice architecture is a very popular approach in designing and implementing highly scalable web applications. Communication within a monolithic application between components is usually based on method or function calls within the same process. A microservices‑based application, on the other hand, is a distributed system running on multiple machines.

Communication between these microservices is important in order to have a stable and scalable system. There are multiple ways to do this. Message-based communication is one way to do this reliably.

When using messaging, components interact with each other by asynchronously exchanging messages. Messages are exchanged through channels.

When Service A wants to communicate with Service B, instead of sending it directly, A sends it to a specific channel. When Service B wants to read the message, it picks up the message from a particular message channel.

In this Spring Integration tutorial, you will learn how to implement messaging in

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