Helidon is a open-sourced project which is a collection of libraries for building Microservice based applications.
Helidon provides two programming models for developers.
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helidon-se embraces Reactive Streams specification, and provides functional style programming experience.
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For those familiar with Java EE/MicroProfile specifications, helidon-mp provides MicroProfile compatibility, it is easy to update yourself to Helidon.
Firstly make sure you have read the official Getting Started guide. And before you create a Helidon project, make sure you have installed all items mentioned in the prerequisites section.