Hi, Spring fans! Welcome to another fun edition of This Week in Spring! I'm writing to you from beautiful Amsterdam ahead of the wonderful Voxxed Days Amsterdam event, and I'm really looking forward to it. If you're there, please come say hello!

Also, be aware that I'll be speaking at the Paris JUG on the 9th, as well as at Devoxx France later in the month. Come say bonjour!

And, of course, I am most looking forward to Spring I/O in beautiful Barcelona, Spain, at the middle of the month!

We’ve got plenty to cover this week, so let’s jump right in!

• Spring Modulith 2.1 M4, 2.0.5, and 1.4.10 released
• Spring AI 2.0.0 M4, 1.1.4, 1.0.5 are available now
• Spring Boot 4.0.5 available now
• Spring Boot 4.1.0 M4 available now
• Spring Cloud Config 5.0.2, 4.3.2, 4.2.6, 4.1.9, and 3.1.13 released and includes a fix for CVE-2026-22739
• I really enjoyed this new video on Spring AI 2.0.0 M4 and Embabel 0.3.4!
• This has nothing to do with Spring, but have you seen Caitie McAffrey's 2015 talk on applying the Saga pattern (and, by extension, workflow engines) to distributed systems? It's fantastic and absolutely worth a watch!
• Here's a great interview with two of my favorite people: Jakub Pillion and Marcin Grzejszczak
• Have you checked out the new guide on Spring App Advisor?
• This is really interesting: a directory of (AI/Anthropic) skills for building Spring and JVM-based applications
• If you'd like a deep dive on Kafka offset commits with Spring Boot, take a look at this excellent post on Piotr's blog
• The new State of Java 2025 report from JetBrains is definitely worth a look
• Our friend Adib Saikali has put together a helpful guide on MCP Security - be sure to check it out!
• Are you using the fantastic JobRunr project? It’s a distributed job-scheduling engine, and one of its coolest features is carbon-aware scheduling. With datacenter, electricity, and RAM costs at all-time highs, one way to reduce the cost of running workloads is to schedule them when the local energy grid is less busy. JobRunr introduced carbon-aware scheduling for Europe in the last 18 months, and now it also has support for the USA. Take a look!