Microservice frameworks on the JVM

While I am reluctant to spend a great deal of time on what a microservice is given that most people are familiar with the topic at this point, I think it would be a remiss not to give at least a brief description in case you are not familiar with the idea. With that said, here is a nice, concise definition of microservice from SmartBear, a provider of software quality tools perhaps best known for their stewardship of the Swagger API and related libraries:

Essentially, microservice architecture is a method of developing software applications as a suite of independently deployable, small, modular services in which each service runs a unique process and communicates through a well-defined, lightweight mechanism ...

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