Jakarta EE - Not just for Servers
summary
Shows how to build HTTP REST services with jax-rs and deploy them to Kubernetes using abs (local dev inside a container, then abs deploy), with health/readiness endpoints, Prometheus metrics and Jaeger tracing auto-configured. Notes Java is rare on AWS Lambda (3.4%) because startup hurts: Express ~0.5s, Spring Boot ~13s; Quercus cuts JVM startups to ~1.6s and native Quercus to ~0.1s. Uses OpenWhisk/Knative scaling models: one-request-one-container causes cold starts, Knative reuses containers to handle concurrent users; demo deploys and runs successfully.
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