Simon Martinelli
@martinelli.ch
Java Champion, Vaadin Champion, Oracle ACE Pro, International Speaker, Programming Architect, and Lecturer for Software Architecture, Java, Persistence, and DevOps.
https://martinelli.ch
https://martinelli.ch
Pinned
Simon Martinelli
@martinelli.ch
· Nov 18
Spec-driven Development with the AI Unified Process
YouTube video by Simon Martinelli
www.youtube.com
The first live stream on spec-driven development is already over.
Thank you all so much for participating. For those who couldn't be there, you can find the recording here:
www.youtube.com/watch?v=jwPB...
Thank you all so much for participating. For those who couldn't be there, you can find the recording here:
www.youtube.com/watch?v=jwPB...
Many people think software engineers will lose their jobs because of AI.
I see it very differently.
AI can generate 100% of the code and tests. Like I described in AIUP.
That part is done.
But software engineering is not coding.
Learn more about AIUP and its artifacts at aiup.dev
I see it very differently.
AI can generate 100% of the code and tests. Like I described in AIUP.
That part is done.
But software engineering is not coding.
Learn more about AIUP and its artifacts at aiup.dev
AI Unified Process - AIUP
Code-centric development leads to maintenance problems, hinders modernization, and causes business misalignment
aiup.dev
January 13, 2026 at 1:12 PM
Many people think software engineers will lose their jobs because of AI.
I see it very differently.
AI can generate 100% of the code and tests. Like I described in AIUP.
That part is done.
But software engineering is not coding.
Learn more about AIUP and its artifacts at aiup.dev
I see it very differently.
AI can generate 100% of the code and tests. Like I described in AIUP.
That part is done.
But software engineering is not coding.
Learn more about AIUP and its artifacts at aiup.dev
🚀 New update: AssertJ support in Testcontainers Mailpit
I just added AssertJ assertions to my Testcontainers Mailpit project.
You can now write fluent assertions instead of low-level checks.
🔗 GitHub: github.com/martinellich...
Feedback is welcome 👍
I just added AssertJ assertions to my Testcontainers Mailpit project.
You can now write fluent assertions instead of low-level checks.
🔗 GitHub: github.com/martinellich...
Feedback is welcome 👍
GitHub - martinellich/testcontainers-mailpit
Contribute to martinellich/testcontainers-mailpit development by creating an account on GitHub.
github.com
January 13, 2026 at 1:12 PM
🚀 New update: AssertJ support in Testcontainers Mailpit
I just added AssertJ assertions to my Testcontainers Mailpit project.
You can now write fluent assertions instead of low-level checks.
🔗 GitHub: github.com/martinellich...
Feedback is welcome 👍
I just added AssertJ assertions to my Testcontainers Mailpit project.
You can now write fluent assertions instead of low-level checks.
🔗 GitHub: github.com/martinellich...
Feedback is welcome 👍
An AI-Ready Architecture for Business Applications
martinelli.ch/an-ai-ready-...
martinelli.ch/an-ai-ready-...
An AI-Ready Architecture for Business Applications - Martinelli
Agentic AI is changing how we build software. AI is no longer just a helper that writes small code snippets. It can reason about requirements, generate larger parts of a system, validate behavior,…
martinelli.ch
January 13, 2026 at 1:12 PM
An AI-Ready Architecture for Business Applications
martinelli.ch/an-ai-ready-...
martinelli.ch/an-ai-ready-...
The Hidden Performance Killer: Understanding Open Session in View in Spring Boot
January 13, 2026 at 1:12 PM
The Hidden Performance Killer: Understanding Open Session in View in Spring Boot
The Hidden Performance Killer: Understanding Open Session in View in Spring Boot
martinelli.ch/the-hidden-p...
martinelli.ch/the-hidden-p...
The Hidden Performance Killer: Understanding Open Session in View in Spring Boot - Martinelli
If you've ever wondered why your Spring Boot application feels sluggish under load despite appearing to work perfectly during development, there's a good chance you've encountered the Open Session in…
martinelli.ch
January 13, 2026 at 1:12 PM
The Hidden Performance Killer: Understanding Open Session in View in Spring Boot
martinelli.ch/the-hidden-p...
martinelli.ch/the-hidden-p...
I’m happy to share that I’m in the top 3% of the most active speakers worldwide in 2025, according to Sessionize.
A big thank you to all conference organizers, attendees, and the amazing community.
Looking forward to many more talks, discussions, and exchanges in the future 🚀
A big thank you to all conference organizers, attendees, and the amazing community.
Looking forward to many more talks, discussions, and exchanges in the future 🚀
January 13, 2026 at 11:27 AM
I’m happy to share that I’m in the top 3% of the most active speakers worldwide in 2025, according to Sessionize.
A big thank you to all conference organizers, attendees, and the amazing community.
Looking forward to many more talks, discussions, and exchanges in the future 🚀
A big thank you to all conference organizers, attendees, and the amazing community.
Looking forward to many more talks, discussions, and exchanges in the future 🚀
Reposted by Simon Martinelli
Spec-Driven-Development mit Simon Martinelli @martinelli.ch und Ralf D. Müller Ralf D. Müller
#SoftwareArchitektur im #Stream
Freitag 2026-01-16 13:00 CET
Mehr Informationen und Möglichkeit für Fragen:
software-architektur...
#SoftwareArchitektur im #Stream
Freitag 2026-01-16 13:00 CET
Mehr Informationen und Möglichkeit für Fragen:
software-architektur...
January 12, 2026 at 5:50 PM
Spec-Driven-Development mit Simon Martinelli @martinelli.ch und Ralf D. Müller Ralf D. Müller
#SoftwareArchitektur im #Stream
Freitag 2026-01-16 13:00 CET
Mehr Informationen und Möglichkeit für Fragen:
software-architektur...
#SoftwareArchitektur im #Stream
Freitag 2026-01-16 13:00 CET
Mehr Informationen und Möglichkeit für Fragen:
software-architektur...
Spec-driven Development is not Task-driven AI
martinelli.ch/spec-driven-...
martinelli.ch/spec-driven-...
Spec-driven Development is not Task-driven AI - Martinelli
Spec-driven development is suddenly everywhere. Many AI tools claim to support it, and many teams say they are already doing it. But when I look closer, what I often see is something very different.…
martinelli.ch
January 11, 2026 at 6:30 PM
Spec-driven Development is not Task-driven AI
martinelli.ch/spec-driven-...
martinelli.ch/spec-driven-...
Reposted by Simon Martinelli
January 11, 2026 at 4:42 PM
How are you testing e-mail in your Spring Boot App?
I use Mailpit and Testcontainers and created an integration. Check it out
github.com/martinellich...
I use Mailpit and Testcontainers and created an integration. Check it out
github.com/martinellich...
GitHub - martinellich/testcontainers-mailpit
Contribute to martinellich/testcontainers-mailpit development by creating an account on GitHub.
github.com
January 10, 2026 at 8:27 PM
How are you testing e-mail in your Spring Boot App?
I use Mailpit and Testcontainers and created an integration. Check it out
github.com/martinellich...
I use Mailpit and Testcontainers and created an integration. Check it out
github.com/martinellich...
Reposted by Simon Martinelli
One Query, Complete Object Graphs: Nested DTOs with jOOQ MULTISET martinelli.ch/one-query-co... by @martinelli.ch
One Query, Complete Object Graphs: Nested DTOs with jOOQ MULTISET - Martinelli
In my previous post about Open Session in View, I explored how this default Spring Boot setting can hide serious performance problems. The N+1 query problem sits behind a system that looks correct in ...
martinelli.ch
January 5, 2026 at 2:02 PM
One Query, Complete Object Graphs: Nested DTOs with jOOQ MULTISET martinelli.ch/one-query-co... by @martinelli.ch
Why User Stories Are a Poor Fit for Spec-Driven Development
martinelli.ch/why-user-sto...
martinelli.ch/why-user-sto...
Why User Stories Are a Poor Fit for Spec-Driven Development - Martinelli
User stories are popular in agile teams. They are short, readable, and focused on user value. For planning work, they can be very useful. However, when the goal is Spec-driven Development, classic…
martinelli.ch
January 5, 2026 at 8:14 AM
Why User Stories Are a Poor Fit for Spec-Driven Development
martinelli.ch/why-user-sto...
martinelli.ch/why-user-sto...
Reposted by Simon Martinelli
This video is still relevant: “AssertJ — Use It Now!” 🚀
If you write Java tests, this one’s for you. Learn how AssertJ can make your assertions cleaner, clearer, and more powerful.
Watch now: youtu.be/qn4AMKTPpg8
#Java #Testing #AssertJ #CleanCode #DevTips
If you write Java tests, this one’s for you. Learn how AssertJ can make your assertions cleaner, clearer, and more powerful.
Watch now: youtu.be/qn4AMKTPpg8
#Java #Testing #AssertJ #CleanCode #DevTips
AssertJ use it now
YouTube video by Mike Møller Nielsen
youtu.be
December 24, 2025 at 9:50 PM
This video is still relevant: “AssertJ — Use It Now!” 🚀
If you write Java tests, this one’s for you. Learn how AssertJ can make your assertions cleaner, clearer, and more powerful.
Watch now: youtu.be/qn4AMKTPpg8
#Java #Testing #AssertJ #CleanCode #DevTips
If you write Java tests, this one’s for you. Learn how AssertJ can make your assertions cleaner, clearer, and more powerful.
Watch now: youtu.be/qn4AMKTPpg8
#Java #Testing #AssertJ #CleanCode #DevTips
While it looks impressive and being in the top 1%, especially considering this is only the code I publish on GitHub, not the code I write for my clients, I have to admit I have a colleague. His name is Claude 😉
January 1, 2026 at 11:21 AM
While it looks impressive and being in the top 1%, especially considering this is only the code I publish on GitHub, not the code I write for my clients, I have to admit I have a colleague. His name is Claude 😉
Reposted by Simon Martinelli
Why Java is the real production language for AI.
Python is ideal for experiments, but enterprise AI needs predictable concurrency, type safety, and stable runtimes. Java already gives us that, plus native performance through ONNX Runtime and Project Panama.
Read: buff.ly/0j6CZ8O
#Java #AI #ONNX
Python is ideal for experiments, but enterprise AI needs predictable concurrency, type safety, and stable runtimes. Java already gives us that, plus native performance through ONNX Runtime and Project Panama.
Read: buff.ly/0j6CZ8O
#Java #AI #ONNX
January 1, 2026 at 7:15 AM
Why Java is the real production language for AI.
Python is ideal for experiments, but enterprise AI needs predictable concurrency, type safety, and stable runtimes. Java already gives us that, plus native performance through ONNX Runtime and Project Panama.
Read: buff.ly/0j6CZ8O
#Java #AI #ONNX
Python is ideal for experiments, but enterprise AI needs predictable concurrency, type safety, and stable runtimes. Java already gives us that, plus native performance through ONNX Runtime and Project Panama.
Read: buff.ly/0j6CZ8O
#Java #AI #ONNX
The holiday card just arrived before the new year.
Thank you @sharatchander.bsky.social
Happy New Year!
Thank you @sharatchander.bsky.social
Happy New Year!
December 31, 2025 at 4:22 PM
The holiday card just arrived before the new year.
Thank you @sharatchander.bsky.social
Happy New Year!
Thank you @sharatchander.bsky.social
Happy New Year!
The Hidden Performance Killer: Understanding Open Session in View in Spring Boot
martinelli.ch/the-hidden-p...
martinelli.ch/the-hidden-p...
The Hidden Performance Killer: Understanding Open Session in View in Spring Boot - Martinelli
If you’ve ever wondered why your Spring Boot application feels sluggish under load despite appearing to work perfectly during development, there’s a good chance you’ve encountered the Open Session in ...
martinelli.ch
December 30, 2025 at 11:12 AM
The Hidden Performance Killer: Understanding Open Session in View in Spring Boot
martinelli.ch/the-hidden-p...
martinelli.ch/the-hidden-p...
🚀 Release announcement: vaadin-jOOQ-archetype 1.0.0
I just released version 1.0.0 of my Vaadin jOOQ Maven Archetype.
It helps you bootstrap a modern Java full-stack application with:
- Vaadin 25
- Spring Boot 4
- jOOQ
Clean, production-ready defaults
#keepitsimple
I just released version 1.0.0 of my Vaadin jOOQ Maven Archetype.
It helps you bootstrap a modern Java full-stack application with:
- Vaadin 25
- Spring Boot 4
- jOOQ
Clean, production-ready defaults
#keepitsimple
GitHub - martinellich/vaadin-jooq-archetype
Contribute to martinellich/vaadin-jooq-archetype development by creating an account on GitHub.
github.com
December 29, 2025 at 8:14 AM
🚀 Release announcement: vaadin-jOOQ-archetype 1.0.0
I just released version 1.0.0 of my Vaadin jOOQ Maven Archetype.
It helps you bootstrap a modern Java full-stack application with:
- Vaadin 25
- Spring Boot 4
- jOOQ
Clean, production-ready defaults
#keepitsimple
I just released version 1.0.0 of my Vaadin jOOQ Maven Archetype.
It helps you bootstrap a modern Java full-stack application with:
- Vaadin 25
- Spring Boot 4
- jOOQ
Clean, production-ready defaults
#keepitsimple
Reposted by Simon Martinelli
Spring Boot 4 finally has a dedicated OpenTelemetry starter. No more pulling in actuator just for observability.
Metrics, traces, and logs via OTLP out of the box.
youtu.be/6_Y41z7OIv8
Metrics, traces, and logs via OTLP out of the box.
youtu.be/6_Y41z7OIv8
Spring Boot 4 OpenTelemetry: From Zero to Full Observability in Minutes
YouTube video by Dan Vega
youtu.be
December 23, 2025 at 6:41 PM
Spring Boot 4 finally has a dedicated OpenTelemetry starter. No more pulling in actuator just for observability.
Metrics, traces, and logs via OTLP out of the box.
youtu.be/6_Y41z7OIv8
Metrics, traces, and logs via OTLP out of the box.
youtu.be/6_Y41z7OIv8
The two MCP servers for jOOQ and Karibu Testing now use HTTP instead of SSE.
Please update your configuration.
If you encounter any problems, please let us know!
Happy Holidays! 🎅
Please update your configuration.
If you encounter any problems, please let us know!
Happy Holidays! 🎅
December 23, 2025 at 2:49 PM
The two MCP servers for jOOQ and Karibu Testing now use HTTP instead of SSE.
Please update your configuration.
If you encounter any problems, please let us know!
Happy Holidays! 🎅
Please update your configuration.
If you encounter any problems, please let us know!
Happy Holidays! 🎅
I like to explain the difference between vibecoding and spec-driven development with a cooking analogy.
Cooking is vibecoding.
You start with an idea, try things out, taste, and adjust.
Baking is spec-driven development.
You define everything upfront: ingredients, quantities, order, timing.
Cooking is vibecoding.
You start with an idea, try things out, taste, and adjust.
Baking is spec-driven development.
You define everything upfront: ingredients, quantities, order, timing.
December 22, 2025 at 8:14 AM
I like to explain the difference between vibecoding and spec-driven development with a cooking analogy.
Cooking is vibecoding.
You start with an idea, try things out, taste, and adjust.
Baking is spec-driven development.
You define everything upfront: ingredients, quantities, order, timing.
Cooking is vibecoding.
You start with an idea, try things out, taste, and adjust.
Baking is spec-driven development.
You define everything upfront: ingredients, quantities, order, timing.
Reposted by Simon Martinelli
👾New on CyberJAR: What's New in JDK 26?
Next feature release of #Java includes 10 JEPs, mostly with improvements to the features under development. Here's a laconic overview:
www.youtube.com/watch?v=wtTd...
Next feature release of #Java includes 10 JEPs, mostly with improvements to the features under development. Here's a laconic overview:
www.youtube.com/watch?v=wtTd...
Java 26 Preview: New JEPs and What They Mean for You
YouTube video by CyberJAR
www.youtube.com
December 19, 2025 at 3:21 PM
👾New on CyberJAR: What's New in JDK 26?
Next feature release of #Java includes 10 JEPs, mostly with improvements to the features under development. Here's a laconic overview:
www.youtube.com/watch?v=wtTd...
Next feature release of #Java includes 10 JEPs, mostly with improvements to the features under development. Here's a laconic overview:
www.youtube.com/watch?v=wtTd...