Quarkus

We are working on a transaction processing application and everything needs to happen in real-time. I have used AWS Lambda with Quarkus + Java, and struggled with cold start time however Lambda is still cost effective. so wanted to understand which one will be suitable as alternative to lambda services.

Can I mix RxJava with Quarkus?

Moving from a classic monolithic Java EE application on-premise to a cloud application based on microservices. What is the easier framework to learn/to move on? is Quarkus enough mature for production? Is the performance of Quarkus in production the same as the benchmarks suggest?

We use Quarkus with native compilation in GraalVM for our global REST-API "Charon", that can be used by every developer to request user, server and game-data (protected through OAuth2). Quarkus offers a reliable framework, library and stack for high-quality APIs and integrates Vert.x into its core.

GraalVM pushes the performance boundaries even further with the ability to perform ahead-of-time native compilation so we can reach an incredible small memory-footprint and fast bootup-times that we need for our microservices architecture.

As the access to our global REST-API "Charon" is bound to OAuth2, we use Keycloak inside Quarkus to authenticate and authorize users of our API. It is not possible to perform any un-authenticated requests against this API, so we wanted to make really sure that the authentication/authorization component is absolutely reliable and tested. We found those attributes within Keycloak, so we used it.