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In modern, microservices-oriented architectures, we want to keep components as independent as possible. When service A performs an action (e.g. registers a user), service B should respond to it (e.g. send a welcome email) without A needing to know from B directly.

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If you’ve been around the Java world for a while, you know the picture: your code is littered with defensive queries like:

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In the world of Java development, we have become accustomed to rapid change. Almost two decades have passed since the legendary article saying goodbye to Java 8, and the platform has continued to evolve. The monolithic release cycle is history. Instead, we get new features every six …