Event-driven microservices can be straightforward to describe before implementing, testing, and maintaining. They are also highly responsive to new information in real time, with latencies in Java of below 10 microseconds 99.99% of the time, depending on the functionality of the small, independently deployable microservice

In this introductory article, we use an example event-driven Hello World program (a programming paradigm where the program flow is determined by events) to step through behaviour-driven development, where we describe the behaviour the business needs first as test data and writing a very simple microservice which turns input events like this:

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