Hi, Spring fans! Welcome to another installment of This Week in Spring! How are you? It's September 26th, 2023, and I am in sunny Singapore for SpringOne at VMWare Explore Singapore. If you're around, don't forget to say hi!

It's gonna be a fun and busy week in Singapore, and then next week I'm off to Antwerp, Belgium, for the amazing Devoxx BE 2023. Then, I'm off to Morocco, for Devoxx MA 2023. Then, I'm off to Amsterdam for SpringOne Tour Amsterdam. If you're in any of these places, do not hesitate to reach out and say hi! I'd love to chat! And with that, we've got a ton of things to cover so let's dive right into it!

• Java 21 is here, and I wrote a huuuuge explainer about all the new features in this blog here: Hello, Java 21
• If you want to watch your knowledge instead of read it, you might watch this video instead
• Want to learn more about one key dimension of the new features in Java 21? Check out this article from Java language architect Brian Goetz from 2022: Data Oriented Programming in Java
• How Google Cloud emulators and Testcontainers speed up development | Google Cloud Blog
• Want to use Oracle OpenJDK 21 in Github Actions? Julien Dubois has you sorted
• Simplified Event Externalization with Spring Modulith
• Spring Cloud Dataflow 2.11.0 Released
• Spring Modulith ? A Deep Dive (Workshop) - YouTube
• Spring for GraphQL 1.0.5, 1.1.6, 1.2.3 released
• Blog: kubeadm: Use etcd Learner to Join a Control Plane Node Safely