Marcin Grzejszczak
@toomuchcoding.com
Java Champion. Working on observability and contract testing - Micrometer, Spring Cloud Contract.
I'm more than happy to announce the first 0.1.0 release of Stubborn Contract. You can read more about it here stubborn.sh/blog/announc...
Announcing Stubborn Contract 0.1.0
The first stable release of the official continuation of Spring Cloud Contract — a modern JVM stack, Spring-free messaging, and drop-in SCC compatibility.
stubborn.sh
How do you like the new stubborn.sh docs? docs.stubborn.sh your feedback is invaluable! #consumerdrivencontracts #springcloud contract
Stubborn Contract: The Official Continuation of Spring Cloud Contract
Stubborn Contract is the official continuation of Spring Cloud Contract, led by Marcin Grzejszczak, one of its original creators. Future development continues under the Stubborn organization.
stubborn.sh
Yup! It's official. Spring Cloud Contract is becoming stubborn.sh
Spencer Gibb@spencer.gibb.us · 2mo agoToday, we are announcing a transition for Spring Cloud Contract. All maintenance, support, and ownership of the project will be officially transferred to one of its original creators, Marcin Grzejszczak @toomuchcoding.com, under Stubborn.sh spring.io/blog/2026/07...
Tell your agent to use IntelliJ IDEA functionality using the IntelliJ MCP server. If you're also interested, you can see the supported tools here: www.jetbrains.com/help/idea/mc... "better quality, fewer tokens burnt" - Thanks @toomuchcoding.com, I couldn't have said it better myself!
🍃 From Contracts to Confidence: Spring Cloud Contract 5 in the Age of AI by @toomuchcoding.com @ Spring I/O 2026 ▶️ Video: youtu.be/WxyUF4iISDI #springio26
From Contracts to Confidence: Spring Cloud Contract 5 in the Age of AI by Marcin Grzejszczak
YouTube video by Spring I/O
youtu.be
The #SpringCloud team is pleased to announce a pair of releases: Spring Cloud 2025.0.3 and 2025.1.2. These releases contain bug and CVE fixes and a handful of enhancements. OSS support for 2025.0.3 ends soon (June 2026). 2025.1.2 is compatible with #SpringBoot 4.0.x and the newly released 4.1.x.
Spring Cloud 2025.0.3 (aka Northfields) Has Been Released
Level up your Java code and explore what Spring can do for you.
spring.io
@toomuchcoding.com & Jakub Pilimon discuss how typo broke production and the fix became a framework. They also look at where this is going next. Capture real traffic, generate contracts automatically, and let people review what matters. 🎧 #GOTOpodcast: gotopia.tech/podcast
In the age of AI tests are more important than ever, they are the guardrails for LLMs. Contract tests are essential for you to guard integrations. Check stubborn.sh as an implementation of contract tests with Spring Cloud Contract (works for npm too!)
Stubborn — Branch-aware contract governance for Spring Cloud Contract
Governance server for Spring Cloud Contract. Verify before you deploy. Every branch, every service.
stubborn.sh
There's no better place to make an announcement than SpringIO Barcelona! I'm happy to announce stubborn.sh - a broker for Spring Cloud Contract contracts! Check the demo at demo.stubborn.sh
🚀 Datasource Micrometer v1.4.1 & v2.2.1 have been released. Highlights • GraalVM hints for SPRING_PROXY • Fix ClassLoader for SpringJdbcProxyFactory Release Notes • github.com/jdbc-observa... • github.com/jdbc-observa... #springboot #micrometer #observability #jdbc
Release Release v1.4.1 · jdbc-observations/datasource-micrometer
Add runtime hints for SpringJdbcProxyFactory (#107) Extract connection info retrieval from DataSourceObservationListener (#108) Specify fixed classloader in SpringJdbcProxyFactory (#109) Changelog...
github.com
Today I've managed to officially confirm with the first company to deliver a workshop similar to this one maven.com/toomuchcodin... ! Around 40 people 😱! If your company is also interested ping me 💪
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.
maven.com
Just FYI on April 1st, the TOOMUCHCODING promo code that gives you a 200$ discount will be turned off. If there's a discount it will not be that high anymore so that's your last chance really to use it! Use this link to get your discount now: maven.com/toomuchcodin...
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.
maven.com
A junior dev fixed a typo. It broke production. That bug eventually led to #SpringCloudContract. @toomuchcoding.com sits down with Jakub Pilimon to talk 15y of Spring, why #observability is missing context & how AI might fix the contract testing adoption problem for good 👇 youtu.be/D-yp3sB8cu0?...
A Typo Led to the Creation of Spring Cloud Contract • Marcin Grzejszczak & Jakub Pilimon • GOTO 2026
YouTube video by GOTO Conferences
youtu.be
Another dream come true! It was such honor and pleasure to have been interviewed by Jakub Pilimon for @gotocon.com . Enjoy! www.youtube.com/watch?list=P...
A Typo Led to the Creation of Spring Cloud Contract • Marcin Grzejszczak & Jakub Pilimon • GOTO 2026
YouTube video by GOTO Conferences
youtube.com
Aaaand I have my first student for the June's cohort! Be like Wojciech! Let's Generate, Break and then Fix stuff with AI 😀 maven.com/toomuchcodin...
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.
maven.com
Do you know that there are already 100 people on the waitlist of maven.com/toomuchcodin... workshop? And do you know that you can get 200$ discount with the TOOMUCHCODING promo code? The offer is valid until the end of March. There will not be any such discount again!
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.
maven.com
Final call! In 4 hours we start the lightning lessons about breaking #AI code in 60 seconds! maven.com/p/4b47ed/wat... Join me - it's going to be fun!
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…
maven.com
How time flies! In about 20 hours I'm running my lightning lesson! maven.com/p/4b47ed/wat... tell your friends, tell your family, bring your dog - it's going to be fun!
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…
maven.com
Claude is down... I remember that I used something to code myself one day, but what was that? 🤔
On Thursday 18:00 CEST I'm going the Lightning Session about me breaking AI generated apps. There are about 50 people already registered to watch - come and join us! Take your kids, your grandmother, your dog, all of them can start using AI! maven.com/p/4b47ed/wat...
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…
maven.com
Hey 👋 just a friendly reminder that on Thursday at 18 cest I'll be running a free (that's a good price!) lightning session about creating, running, breaking and fixing AI apps! Check it out here maven.com/p/4b47ed/wat...
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…
maven.com
#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...
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…
maven.com
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...
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...
maven.com
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.
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…
maven.com
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
I love plan mode! | Marcin Grzejszczak
Why I think plan mode is awesome...
toomuchcoding.com
🎤 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...
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
I Can See Clearly Now: Observability of JVM & Spring Boot 2-3-4 apps
Friday, March 6, 2026 @ 1:20 PM
brcm.tech
I am proud of myself. I'm almost out of tokens but at least this time 1 HOUR HAS PASSED!!! #YouAreAbsolutelyRight
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?)
Subscribe | Marcin Grzejszczak
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