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Lukáš Křečan

@lukas-krecan

SW engineer, maintaner of JsonUnit and ShedLock

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14.11.2024
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Latest posts by Lukáš Křečan @lukas-krecan

A brown penguin chick of some kind. It looks very much like a man in a suit. It is bedraggled and miserable

A brown penguin chick of some kind. It looks very much like a man in a suit. It is bedraggled and miserable

Made it to Friday but at what cost

06.03.2026 03:24 👍 6655 🔁 1305 💬 58 📌 93

Cursor is now available in IntelliJ IDEA through the Agent Client Protocol – giving you more flexibility in how you work with AI agents.
Learn more 👇

04.03.2026 16:16 👍 9 🔁 1 💬 0 📌 0

love a bit of continvouclous morging

16.02.2026 17:10 👍 832 🔁 231 💬 39 📌 44
The reason why RAM has become four times more expensive is that a huge amount of RAM that has not yet been produced was purchased with non-existent money to be installed in GPUs that also have not yet been produced, in order to place them in data centers that have not yet been built, powered by infrastructure that may never appear, to satisfy demand that does not actually exist and to obtain profit that is mathematically impossible.

The reason why RAM has become four times more expensive is that a huge amount of RAM that has not yet been produced was purchased with non-existent money to be installed in GPUs that also have not yet been produced, in order to place them in data centers that have not yet been built, powered by infrastructure that may never appear, to satisfy demand that does not actually exist and to obtain profit that is mathematically impossible.

From Reddit via an AI newsletter. It's a perfect encapsulation of the IT world at the moment.

12.01.2026 20:23 👍 3 🔁 1 💬 0 📌 1
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06.12.2025 19:38 👍 6738 🔁 1458 💬 217 📌 102
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In nur 5 Jahren hat China den Automobilmarkt übernommen und ist uns parallel beim E-Auto davon gerast.

Dass Kanzler Merz allen ernstes davon spricht, dass wir 2035 noch "hocheffiziente Verbrenner" verkaufen, macht es noch verrückter.

01.12.2025 19:06 👍 1965 🔁 737 💬 92 📌 54
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The Shutdown of U.S.A.I.D. Has Already Killed Hundreds of Thousands The short documentary “Rovina’s Choice” tells the story of what goes when aid goes.

One analytical model shows that, as of November 5th, the dismantling of U.S.A.I.D. has already caused the deaths of 600,000 people, two-thirds of them children. https://newyorkermag.visitlink.me/jUzNSc

06.11.2025 21:00 👍 9259 🔁 6017 💬 435 📌 1282
Judgment Day What if AI takes your job? Teedy Deigh finds out.

It's Halloween. So here's a story about the horror of replacing your developers with AI:
accu.org/journals/ove...

31.10.2025 07:27 👍 24 🔁 14 💬 2 📌 2
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27.10.2025 14:48 👍 4 🔁 1 💬 0 📌 0

Why does everyone keep calling it “The Epstein Ballroom?” Please stop repeating “The Epstein Ballroom” because it is not called “The Epstein Ballroom!” Don’t tell the news that it’s called “The Epstein Ballroom” and please don’t repost this!!!!!

22.10.2025 22:33 👍 22537 🔁 9947 💬 775 📌 711

Feel the AGI!

19.10.2025 10:42 👍 6 🔁 1 💬 0 📌 0
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Forward in a Caimh McDonnell book...

🤣😆

12.10.2025 20:15 👍 121 🔁 29 💬 10 📌 3

JsonUnit 5 has been released:
- Jackson 3 support
- Support for Spring 7 RestTestClient
- JSpecify nullability annotations

13.10.2025 06:51 👍 1 🔁 0 💬 0 📌 0

Fun factoid to start the day: regardless of the difficulty of the topic, the compute (and energy) overhead of an interaction with an LLM is a function of the total number of tokens (input + output) involved.

Bit of a clue, dontcha think?

10.10.2025 05:46 👍 5 🔁 2 💬 1 📌 0
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Release Liquibase v5.0.0 · liquibase/liquibase Liquibase Community 5.0 is a major release See the Liquibase Community 5.0 Release Notes for the complete set of release information. ⚠️ MAJOR CHANGES IN COMMUNITY AND COMMERCIAL DISTRIBUTIONS Liqu...

I'm surprised that there wasn't more noise around the license change of #Liquibase from Apache License 2.0 to Functional Source License (FSL) in Liquibase 5.0.0.
github.com/liquibase/li...

Is just nobody using it anymore? 😅

#Java #OSS #licensing

05.10.2025 20:56 👍 13 🔁 11 💬 4 📌 2

Please join me in congratulating Woman on her appointment

03.10.2025 11:02 👍 16459 🔁 2589 💬 404 📌 107

BBC news: "Denmark says 'professional actor' behind drone incursions over its airports"

Me: I bet AmDram societies all over Europe are breathing a sigh of relief.
...
Me: Oh, *that* kind of professional actor.

25.09.2025 14:24 👍 12 🔁 3 💬 1 📌 0
A comic on the bridge from Star Trek the Next Generation.
Picard: COMMANDER DATA, PLEASE IDENTIFY THAT ROMULAN VESSEL.
Data: THAT'S A GREAT IDEA CAPTAIN!
IDENTIFYING A VESSEL IS A GREAT PLACE TO START - IN ANY TACTICAL OR STRATEGIC OUTER SPACE SITUATION.
THIS VESSEL APPEARS TO BE A 23rd CENTURY KLINGON BIRD OF
PREY! 🚀🦅✨
Picard: ARE YOU SURE?
LIKE I SAID WE'RE... PRETTY SURE IT'S ROMULAN.
Data: ...
Data: OF COURSE! SO SORRY ABOUT THAT, YOU'RE RIGHT!
ON CLOSER EXAMINATION IT'S A ROMULAN VESSEL! CAN I RECOMMEND SOME SOONG™ BRAND PRODUCTS THAT CAN HELP YOU WITH THAT?
Picard cradles his face in his hand in a gesture of frustration.
Data: DID I MENTION THE PLIGHT OF OPRESSED WHITES IN SOUTH AFRICA?

A comic on the bridge from Star Trek the Next Generation. Picard: COMMANDER DATA, PLEASE IDENTIFY THAT ROMULAN VESSEL. Data: THAT'S A GREAT IDEA CAPTAIN! IDENTIFYING A VESSEL IS A GREAT PLACE TO START - IN ANY TACTICAL OR STRATEGIC OUTER SPACE SITUATION. THIS VESSEL APPEARS TO BE A 23rd CENTURY KLINGON BIRD OF PREY! 🚀🦅✨ Picard: ARE YOU SURE? LIKE I SAID WE'RE... PRETTY SURE IT'S ROMULAN. Data: ... Data: OF COURSE! SO SORRY ABOUT THAT, YOU'RE RIGHT! ON CLOSER EXAMINATION IT'S A ROMULAN VESSEL! CAN I RECOMMEND SOME SOONG™ BRAND PRODUCTS THAT CAN HELP YOU WITH THAT? Picard cradles his face in his hand in a gesture of frustration. Data: DID I MENTION THE PLIGHT OF OPRESSED WHITES IN SOUTH AFRICA?

realistic Star Trek

26.08.2025 17:23 👍 6557 🔁 2500 💬 47 📌 81
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Folks telling me that the larger context windows of LLMs means they "remember" more, I can only assume either didn't check the output or haven't actually tried it.

For scale, a 100 LOC source file I checked had > 1000 tokens.

26.08.2025 07:42 👍 8 🔁 1 💬 2 📌 0
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I am looking for a job I am looking for a job. In short, I am looking for a hands-on tech leadership role, ideally around the JVM ecosystem. I can offer Pragmatic approach to software design and system architecture I hav…

I am looking for a job. Are you looking for a hands-on technical leader in Java and Kotlin ecosystem? You have unique opportunity to snatch me. More details here blog.krecan.net/2025/08/25/i...

25.08.2025 08:44 👍 0 🔁 2 💬 0 📌 0
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Humble Tech Book Bundle: Software Architecture 2025 by O'Reilly Pay what you want for the latest Humble Tech Bundle: Software Architecture 2025 and help support Code for America with your purchase!

Among the books in this year’s Software Architecture humble bundle:

@andrewhl.bsky.social : Facilitating Software Architecture

and

@dianamontalion.com : Learning Systems Thinking

Software Architect Books from Humble Bundle
www.humblebundle.com/books/softwa...

24.08.2025 04:26 👍 9 🔁 4 💬 0 📌 0
Growing the Java Language #JVMLS
Growing the Java Language #JVMLS YouTube video by Java

"Growing the #Java language" by @briangoetz.bsky.social

www.youtube.com/watch?v=Gz7O...

22.08.2025 13:09 👍 22 🔁 6 💬 0 📌 1
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Word

07.08.2025 18:28 👍 9 🔁 2 💬 1 📌 0
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Five Practical Tips for Any Team to Reduce Risks, Increase Agility, and Deliver Value - Johanna Rothman A colleague recently asked me how a team can deliver something useful in the next four to five weeks. “That's all? Just four to five weeks?” I asked. Yes, that was all the time they had remaining. The...

Five Practical Tips for Any Team to Reduce Risks, Increase Agility, and Deliver Value
www.jrothman.com/mpd/2025/08/...
#AgilePrinciples #Collaboration

05.08.2025 19:23 👍 1 🔁 1 💬 0 📌 0

Every time Gradle posts a major release plugins get borked.

Every. Single. Time.

Sometimes even on minor, and patch releases. All just to shave a few nano seconds from build times.

I wonder why I even bother with this broken build tool 🙄😓😡

02.08.2025 09:12 👍 29 🔁 4 💬 5 📌 3
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Pause unused application contexts in the TestContext framework · spring-projects/spring-framework@dbe89ab Since the introduction of the Spring TestContext Framework in 2007, application contexts have always been stored in the context cache in a "running" state. However, leaving a context runn...

🍃 #Spring Framework 7.0 will provide built-in support for pausing & restarting unused application contexts between test classes.

This ensures that background processes in the context are not actively running while the context is not used by tests. 👍🏻

github.com/spring-proje...

15.07.2025 09:49 👍 14 🔁 3 💬 0 📌 0
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Ignoring Fields During Comparison Using AssertJ | Baeldung Learn how to ignore fields during comparisons using AssertJ.

AssertJ is pretty good at it www.baeldung.com/assertj-igno...

14.07.2025 08:36 👍 10 🔁 0 💬 0 📌 0
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Figma's $300k Daily AWS Bill Isn't the Scandal You Think It Is Well, the internet did what the internet does best this week: it collectively lost its mind over a number in an S-1 filing. Figma disclosed they signed a ~$550 million contract with AWS, someone used ...

“$110M a year on AWS? I could do it for half!”

Bro, your last infra project was making a cron job email you weather updates.

Sit down.

www.duckbillgroup.com/blog/figmas-...

10.07.2025 23:04 👍 179 🔁 35 💬 15 📌 8
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Thoughts on Motivation and My 40-Year Career I’ve never published an essay quite like this. I’ve written about my life before, reams of stuff actually, because that’s how I process what I think, but never for public consumption. I’ve been pus…

New post up, with a bunch of thoughts on what drives me personally, and my own 40-year career (h/t @lethain.com).

I have a pretty unusual life story. But one of the reasons I love the tech industry so much is how common unusual stories like mine have historically been.

charity.wtf/2025/07/09/t...

09.07.2025 21:31 👍 155 🔁 33 💬 15 📌 18
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I told you we’d be back

12.06.2025 16:15 👍 42814 🔁 12647 💬 1563 📌 5136