It was really exciting to officially introduce Arconia at Spring I/O last month. Open-source extension improving the developer experience on Spring Boot. I talked about dev services, observability, automated migrations, agent skills, and a sneak peek at the upcoming dev UI. @arconia.io

Planning to use virtual threads with Spring Boot. Means server.tomcat.max-threads will be ignored and server.tomcat.max-connections will effectively determine concurrency, but that's for capping open connections, not actively handled requests. Should I add a semaphore to control concurrency myself?

Just silently broke my Logback-based logging when updating a GraalVM natively compiled Spring Boot app from 3.5.8 to 3.5.14. Goes to show that this is still really tricky to use and not really ready for mass enterprise adoption, as far as I'm concerned.

No better way to get over your King’s Day hangover than some Belgian beer & boogie with Triggerfinger in Paradiso 🎸

Want fewer freezes and bugs in your IntelliJ IDEA? Help us — enable automatic error reporting: Appearance & Behavior → System Settings → Data Sharing → Send error reports automatically Every report helps prioritize fixes. Takes 10 seconds, makes a real difference! #ide #java

Second time I’ll watch this band which I’d never thought I’d be able to see live some years ago!

US citizens actually voted for this con man (and his relatives) 🤦‍♂️ gothburz.substack.com/p/these-even...

Leaving Barcelona after another great @springio.net edition. Glad that I could speak again, very happy to have reconnected with so many people and hope to be at #springio27 that will take place in Valencia! 😎 Thanks to @sergialmar.com and everyone else who made this happen 🙏 #springio26

It’s sorta shocking how many people just don’t care about X and Musk and keep posting there. Here’s another thing that might make you change your mind: cybernews.com/tech/x-shado...

Watching @thomasvitale.com explain his Arconia framework for @spring.io development: very cool, will definitely give this a try. Community hero! 🦸‍♂️ #springio26

Google Maps combined with Barcelona public transport really makes it easy to get around. Hadn’t used Maps for this much yet, but have to admit that I’m impressed with the experience #springio26

Home is where the wifi autoconnects: #springio26 may be in a new location, but phone already feels right at home

Starting my trip to Barcelona for @springio.net, really looking forward to reconnecting with everyone! If you’re attending: I will be speaking on DLQ management for large scale systems on Wednesday, so consider to join me 2026.springio.net/sessions/fal...

Take me to church: guitar ensemble at the ANNA church in Amstelveen

Now playing: youtu.be/1LkYJl5EdNY?...

I see quite some usage of JSON-RPC lately, esp. in AI. Is there some support in the Spring ecosystem for this already? I'm thinking about routing/mapping to handlers, error handling and esp. metrics since editing HTTP metrics are useless b/o the single endpoint.

Cool to read how @springio.net has real-world impact: medium.com/graalvm/insi...

Even Josh and James are in awe when Venkat demos Kotlin in vi while talking as if he was a one-man band #vdams26

“Ik hoop maar dat er roze koeken zijn” youtu.be/F3ZTrGWSLf4?... #dvams26

Alina explaining how GraalVM will focus on AI after Oracle just laid off 30.000 colleagues to pay for those investments is a bit hard to watch. Obviously she is handling it very professionally, but I can’t help thinking about how it must feel to sit there presenting at a time like this… 🫶 #vdams26

Spring-AI deep-dive by @tzolov.bsky.social at #vdams26. Fast-paced with lots of info, at the same time slowly building up to show how all features are based on a small nr of core principles and techniques, very nice!

So Anthropic engineering interviews will now ask “what would YOU improve in our Claude Code code base” as an assignment

En het parlement biedt uiteindelijk nooit tegenwicht. Want kabinet zegt dat ze het heel zorgvuldig gaan doen met de beste regels. Als parlement kun je dan of zeggen "nietus, dat doen jullie helemaal niet", of je kunt meedoen: alles voor de veiligheid! Zie ook mijn stuk berthub.eu/articles/pos...

Random shoutout to the Jon Spencer Blues Explosion 🤯

First blog post of the year is out: Fault Injection with @spring.io using @micrometer.io Baggage Propagation. If you're building complex orchestration flows with Spring and looking for a way to test non-happy flows, this one is for you! trifork.nl/blog/fault-i...

Spring cleanup (although I’m keeping my old Spring books)

Standard tickets are almost SOLD OUT. 🎟️ Get yours before prices go up! 2026.springio.net

Learned that Spring RestClient.Builder is stateful and passes state like interceptors by ref on build. That means that this creates clients with both *two* interceptors: var first = builder.requestInterceptor(someInterceptor).build; var second= builder.requestInterceptor(someInterceptor).build;

To my fellow European techies: why do you still think it’s OK to speak at American conferences? At this point, isn’t it completely obvious that you’re traveling to a country led by a corrupt and fascist regime that needs be boycotted?

God forbid that there’s a plan

Half my timeline is now about AI while the other half shows the US Gestapo in near-real time action. Too fucking unreal, I need to go offline more to stay sane.

New Year’s resolution: listen more John Butler Trio. Weird how I’ve mostly missed them before.

Here we go 🤞 As always for @spring.io, this would be a brand new talk. I've meaning to write or talk about this solution for some years already, so hopefully I'll be able to finally share what we've developed for DLQ management with the whole community in Barcelona next year! 🍃

So fucking predictable news.sky.com/story/us-pla...

I’m working on it! ⏳

Don't know why yet, but turns out that running a Spring Boot app using virtual threads on OpenJ9 24 or 25 in a Linux container results in continuous high CPU load, which did NOT occur on their 21 JVM. Starting investigation, but all clue suggestions are welcome!

In the pocket! 🎸 www.paradiso.nl/programma/tr...

To my fellow European techies: why do you still think it’s OK to speak at American conferences? At this point, isn’t it completely obvious that you’re traveling to a country led by a corrupt and fascist regime that needs be boycotted?

Alas, the TV has died… Probably main board issue, but can’t find replacement. Well, it’s Black Friday, so l’ll take it as a sign #glasshalffull

Ajeto!

It’s time: open.spotify.com/playlist/2QB... Currently listening: open.spotify.com/track/6Owqzz...

Go home Windows, you're drunk

This innocent-looking change in Spring Cloud AWS is actually quite a big improvement for systems that use different message payloads on a single SQS queue: I've written my own custom dispatching for this, looks I can now remove all that code now! 🥳 See docs.awspring.io/spring-cloud... for details

I’ve been saying this for years, yet @broadcom.bsky.social’s Core Spring training still promotes interfaces as return types for @Bean methods… Glad to see the @spring.io 7 release notes making this explicit statement

Did some checking: the problem described in trifork.nl/blog/i-used-... with two configured JSON msg converters persists in Spring Boot 3.5.7, but is no longer there in Boot 4 which configures just a single JacksonJsonHttpMessageConverter! 🥳 Also, both converters have ParameterNamesModule in 3.5.7

Now watching: youtu.be/K3MTqCu9jdM?...

I think you may want to disable `MapperFeature.SORT_CREATOR_PROPERTIES_FIRST` if so -- Records are... challenging as ordering is implied by record declaration, somehing POJOs don't have.

Can we *please* treat the fact that github.com/OpenAPITools... doesn't support Jackson 3 yet as *another* good reason to *finally* stop designing JSON APIs that distinguish between fields missing and being null?

Somehow this received 100K views: nice to see that the topic resonated with so many people!

“Pivot to porn” is a perfect band name, BTW