Speaker Details | Devoxx UK

Thomas Vitale

Systematic

Thomas is a Software Architect specialized in building highly-scalable, resilient, and secure enterprise applications. He develops software solutions at Systematic, Denmark, where he’s been working on modernizing platforms and applications for the cloud-native world, focusing on developer experience and security. Thomas likes contributing to open-source projects like Spring Security and Spring Cloud. He’s the author of “Cloud Native Spring in Action - With Spring Boot and Kubernetes”, published by Manning, where some of his main interests converged, such as Kubernetes, Buildpacks, Knative, and other cloud-native technologies.

Knative and Spring - Bringing back the func

Conference

Kubernetes is now a standard to deploy and manage containerized applications. How do functions fit into the cloud-native space in 2022? What does it take to write a function in Java or any other language and get it up and running in a Kubernetes cluster?

We’ll show with practical examples and a live demo how developers can focus on the business logic while the platform takes care of supporting event-driven and serverless workloads in a polyglot environment.

CloudEvents provide a language and transport-agnostic way to describe events.
Knative Eventing routes CloudEvents between producers and consumers so that developers don’t have to worry about which message broker is used under the hood (e.g. RabbitMQ, Kafka, cloud-provider specific).
Frameworks like Spring Cloud Functions let developers focus on implementing the business logic instead of dealing with infrastructural concerns and integrations with event brokers.
GraalVM and libraries like Spring Native make it possible to build serverless applications in Java and take advantage of the scale-to-zero feature offered by Knative Serving.
Cloud Native Buildpacks solve the problem of building production-ready containers end to end, offering support for multiple languages and frameworks, and focusing on performance and security.

To demonstrate how all these tools can work together, we will show how Knative `func` combines them and provide developers with a Dockerfile-free and Kubernetes YAML-free experience.

Event-Driven Microservices

Spring Cloud Gateway: Resilience, Security, and Observability

Conference

Do you want to use a microservices architecture? Are you looking for a solution to manage access to single services from clients? How can you ensure resilience and security for your entire system? Spring Cloud Gateway is a project based on Reactor, Spring WebFlux, and Spring Boot which provides an effective way to route traffic to your APIs and address cross-cutting concerns.

In this session, I'll show you how to configure an API gateway to route traffic to your microservices architecture and implement solutions to improve the resilience of your system with patterns like circuit breakers, retries, fallbacks, and rate limiters using Spring Cloud Circuit Breaker and Resilience4J. Since the gateway is the entry point of your system, it’s also an excellent candidate to implement security concerns like user authentication. I'll show you how to do that with Spring Security, OAuth2, and OpenID Connect, relying on Spring Redis Reactive to manage sessions. Finally, I'll show you how to improve the observability of your system using Spring Boot Actuator and Spring Cloud Sleuth and relying on the Grafana stack.