Marcin Grzejszczak's Avatar

Marcin Grzejszczak

@toomuchcoding.com

Java Champion. Working on observability and contract testing - Micrometer, Spring Cloud Contract.

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10.11.2024
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Latest posts by Marcin Grzejszczak @toomuchcoding.com

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Watch AI Build a Microservice. Watch Me Break It in 60 s AI can generate clean microservices in seconds. But production systems fail due to latency, retries, and dependency coupling - not syntax errors. In this live demo, you’ll see how a small delay can…

#AI can generate microservices in seconds.

But it usually forgets timeouts, retries, and circuit breakers.

Next week I’ll run a live demo where we generate services with AI and then break them by injecting latency.

No slides. Just a terminal.

maven.com/p/4b47ed/wat...

06.03.2026 11:31 👍 1 🔁 0 💬 0 📌 0
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Watch AI Build a Microservice. Watch Me Break It in 60 s AI can generate clean microservices in seconds. But production systems fail due to latency, retries, and dependency coupling - not syntax errors. In this live demo, you’ll see how a small delay can ca...

What happens if you let AI build a microservice?

Next Thursday (12 Mar, 18:00 CET) I’ll show it live in a ⚡ lightning lesson.

First: AI builds the service.
Then: I try to break it in 60 seconds.

A quick look at what AI coding tools can - and can’t - do yet.

Details:
maven.com/p/4b47ed/wat...

04.03.2026 17:16 👍 0 🔁 0 💬 0 📌 0
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Watch AI Build a Microservice. Watch Me Break It in 60 s AI can generate clean microservices in seconds. But production systems fail due to latency, retries, and dependency coupling - not syntax errors. In this live demo, you’ll see how a small delay can…

I’m running a live demo on March 12 (6 pm CET).

I’ll have AI generate two services.
We’ll look at the code.
Then I’ll add latency and break it live.

No slides. Just a terminal and real behavior.

maven.com/p/4b47ed/wat...

If you’re using #AI to build backend systems, this is worth your time.

03.03.2026 22:27 👍 0 🔁 0 💬 0 📌 0

I want it!

02.03.2026 10:06 👍 0 🔁 0 💬 0 📌 0

thanks I'll check it out!

26.02.2026 12:43 👍 0 🔁 0 💬 0 📌 0

Wdym by "TEST ASSERTION DSLS ARE BAD."?

26.02.2026 10:25 👍 0 🔁 0 💬 1 📌 0

AbstractSingletonProxyFactoryBeanPostProcessor

26.02.2026 10:20 👍 1 🔁 0 💬 0 📌 0
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I love plan mode! | Marcin Grzejszczak Why I think plan mode is awesome...

Are you a fan of "plan mode" too? I wrote a blog post about why I think it's awesome toomuchcoding.com/post/2026-02... (of course LLM still ignores what we agreed upon there...) #YesYouAreRight #YouAreAbsolutelyRight

24.02.2026 13:13 👍 2 🔁 0 💬 0 📌 0
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🎤 Agata Kabat is joining our speakers!

In her talk “Before the To-Do List: The One Conversation Every Team Needs”, Agata will explore how intentional communication and a strong team contract build real collaboration, trust, and productivity.

2026.geecon.org/speakers/inf...

24.02.2026 10:07 👍 1 🔁 1 💬 0 📌 0
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I Can See Clearly Now: Observability of JVM & Spring Boot 2-3-4 apps Friday, March 6, 2026 @ 1:20 PM

Is your production app behaving like a gremlin? Stop the chaos! Join Jonatan Ivanov at #Devnexus to learn how to make your #Java, #JVM, and #SpringBoot applications observable. Get the practical tools you need.

https://brcm.tech/46CHHch

23.02.2026 21:27 👍 3 🔁 3 💬 0 📌 0
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Generate, Break, Fix: Distributed Systems in the AI Era - new workshop! | Marcin Grzejszczak Generate, Break, Fix: Distributed Systems in the AI Era - I'm running a new workshop!

My new post about the new AI workshops! toomuchcoding.com/post/2026-02... #ai

23.02.2026 19:03 👍 0 🔁 0 💬 0 📌 0
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I am proud of myself. I'm almost out of tokens but at least this time 1 HOUR HAS PASSED!!! #YouAreAbsolutelyRight

23.02.2026 14:13 👍 0 🔁 0 💬 0 📌 0
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Subscribe | Marcin Grzejszczak If you’d like new posts by email, subscribe below (unsubscribe anytime): Previous issues Below are links to previous issues.

I've added links to the old issues of the TooMuchCoding newsletter. If you want to check them out just go here toomuchcoding.com/subscribe/ (but why click if you can subscribe and get the issues straight to your email?)

22.02.2026 07:34 👍 0 🔁 0 💬 0 📌 0
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Issue #10 of the TooMuchCoding newsletter is out! 10 straight weeks of publishing info about what's going on in the IT world - so you don't have to! If you're interested in AI, JVM, Observability etc. go to toomuchcoding.com/subscribe/ and subscribe!

21.02.2026 17:59 👍 1 🔁 0 💬 0 📌 0
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Generate, Break, Fix: Distributed Systems in the AI Era by Marcin Grzejszczak on Maven Diagnose, fix, and prevent the distributed systems failures that every AI coding agent creates - in any language.

Hey 👋 I'm preparing a workshop about working with AI and distributed systems. If you're interested in the topic please help me out and fill out the survey! maven.com/toomuchcodin... #ai #microservices

21.02.2026 11:00 👍 0 🔁 0 💬 0 📌 0
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If I got a dollar every time I read this... #YouAreAbsolutelyRight

19.02.2026 22:17 👍 1 🔁 0 💬 0 📌 0
https://maven.com/forms/e8d298

Hey 👋 i need your help and your feedback about AI and distributed systems (for my workshop agenda). Please fill out the survey and repost 🙏 maven.com/forms/e8d298

19.02.2026 14:58 👍 0 🔁 0 💬 0 📌 0

LGTM - ship it!

19.02.2026 12:17 👍 0 🔁 0 💬 0 📌 0
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Generate, Break, Fix: Distributed Systems in the AI Era by Marcin Grzejszczak on Maven Diagnose, fix, and prevent the distributed systems failures that every AI coding agent creates - in any language.

If you're interested in using AI in such a way that your apps will not break in production due to obvious issues of distributed systems check out the workshop that I'm working on "Generate, Break, Fix: Distributed Systems in the AI Era" - maven.com/toomuchcodin... #ai #YouAreAbsolutelyRight

18.02.2026 10:07 👍 1 🔁 0 💬 0 📌 0
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This is the feedback I got after doing the Java Microservices with Spring workshop. Now I'm upgrading that workshop into an AI native one where we will Generate, Break and Fix distributed systems using AI! Check it out here: maven.com/toomuchcodin...

17.02.2026 21:32 👍 0 🔁 0 💬 0 📌 0
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Generate, Break, Fix: Distributed Systems in the AI Era by Marcin Grzejszczak on Maven Diagnose, fix, and prevent the distributed systems failures that every AI coding agent creates - in any language.

First cohort coming soon. Join the waitlist:

maven.com/toomuchcoding/generate-break-fix-distributed-systems-in-the-ai-era

What's the worst thing AI has generated for you in a backend system?

16.02.2026 16:35 👍 0 🔁 0 💬 0 📌 0

So I'm building a workshop:

"Generate, Break, Fix: Distributed Systems in the AI Era"

→ You bring your laptop, your AI tool, Docker
→ I bring broken infrastructure - injecting latency, flaky service discovery etc.
→ You generate with AI, I break it, you fix it

Any language. No slides.

16.02.2026 16:35 👍 0 🔁 0 💬 1 📌 0

I spent ~10 years building Spring Cloud Sleuth (now Micrometer Tracing) and Spring Cloud Contract.

The tools AI agents keep getting wrong. I've seen these failure patterns from both sides.

16.02.2026 16:35 👍 0 🔁 0 💬 1 📌 0
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Generate, Break, Fix: Distributed Systems in the AI Era by Marcin Grzejszczak on Maven Diagnose, fix, and prevent the distributed systems failures that every AI coding agent creates - in any language.

I've been using AI coding agents daily for months.

They're incredible at generating code.
They're NOT that incredible at distributed systems.

Same mistakes every time: no resilience, no observability, hardcoded everything. Services that compile and fall apart in production.

16.02.2026 16:35 👍 1 🔁 0 💬 1 📌 0
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Issue 9 of TooMuchCoding newsletter is out! Grab it while it's hot! We're getting close to 100 subscribers. If you want to help me reach that milestone go to toomuchcoding.com/contact and subscribe there! You don't have to believe me - look what ChatGpt said... #YouAreAbsolutelyRight

14.02.2026 21:47 👍 0 🔁 0 💬 0 📌 0
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Java Microservices with Spring by Marcin Grzejszczak on Maven Learn how to do Java Microservices with Spring with the Spring Framework and Micrometer committer.

Today I finished the 2 week workshops with 9 students where we worked on how to do Java Microservices with Spring. 12 hours over 2 weeks. It was sheer pleasure and I hope that you enjoyed it! maven.com/toomuchcodin...

13.02.2026 22:07 👍 1 🔁 0 💬 0 📌 0
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I don't know about you but every time I ask AI to do some complex task with technologies i don't have a lot of experience in I feel like Neo... #YesYouAreRight #YesYouAreAbsolutelyRight

12.02.2026 07:26 👍 1 🔁 0 💬 0 📌 0

Finally, voice of reason!

12.02.2026 06:44 👍 0 🔁 0 💬 0 📌 0
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a woman wearing a hat and a white tank top has the word rage on her chest ALT: a woman wearing a hat and a white tank top has the word rage on her chest
11.02.2026 18:48 👍 0 🔁 0 💬 1 📌 0
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Never trust anyone who says you shouldn't look at what an LLM does. I was seconds away from a catastrophe... #YesYouAreRight #YesYouAreAbsolutelyRight

11.02.2026 16:45 👍 1 🔁 0 💬 2 📌 0