Helidon
Helidon is a set of Java libraries for building microservices-based applications, designed to be lightweight, fast, and cloud-native. It offers two programming models: Helidon SE for a reactive, functional style and Helidon MP for a MicroProfile-compliant, annotation-driven approach. It integrates seamlessly with tools like Docker and Kubernetes, making it suitable for modern cloud deployments.
Developers should learn Helidon when building microservices in Java that require high performance and low overhead, especially in cloud environments like Kubernetes. It's ideal for projects needing a lightweight alternative to heavier frameworks like Spring Boot, with use cases including REST APIs, reactive systems, and serverless applications where fast startup times and minimal resource usage are critical.