iiinova — where your digital self keeps evolving

Roland Weisleder @rweisleder.de · 11/08/2026

Me traveling from DE 🇩🇪 into the NL 🇳🇱 bounded context. A domain event occurred.

Railway station sign for Deventer, a city in the Netherlands.

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Roland Weisleder @rweisleder.de · 07/07/2026

Ah, those cryptic tracking numbers again... #scammers

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Roland Weisleder @rweisleder.de · 23/06/2026

Sitting in a bus in Strasbourg when suddenly @kevlin.bsky.social enters

Display in a bus showing a shell with a login prompt

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Roland Weisleder @rweisleder.de · 18/06/2026

Today at the @lu.voxxeddays.com, talking about architecture and legacy systems

Main stage of the Voxxed Days Luxembourg

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Roland Weisleder @rweisleder.de · 09/06/2026

Tonight at the @jugbb.bsky.social where @martinelli.ch talks about spec-driven development

Speaker in front of a screen showing the title slide of the talk "Lessons from Spec-driven Development"

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Roland Weisleder @rweisleder.de · 27/04/2026

Complexity is easy to add, but hard to remove.

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Roland Weisleder @rweisleder.de · 17/01/2026

A @kevlin.bsky.social at a metro ticket machine in Chongqing, China

Display of a ticket machine showing the Windows Explorer

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Roland Weisleder @rweisleder.de · 30/10/2025

Thankfully, the project follows a strict branching strategy. Otherwise it would be pure chaos if a second developer worked on it today.

Git graph showing a tangled mess of overlapping branches and merges, all created by a single developer in one day.

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Roland Weisleder @rweisleder.de · 22/09/2025

Honored to have been chosen as @sessionize.com Speaker of the Day!

Screenshot of sessionize.com showing the author being recognized as "Speaker of the Day"

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Roland Weisleder @rweisleder.de · 20/08/2025

*opens new Java legacy project* *opens random POJO* *sighs deeply*

Java code snippet with two fields:
private Boolean optional = false;
private @Nullable Boolean isMandatory = null;

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Roland Weisleder @rweisleder.de · 20/08/2025

Something that annoyed me when viewing test results in IntelliJ: it indeed shows the execution time for each test method, but not how long it took for example to start @SpringBootTest. Today I discovered "Use Wall Time".

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Roland Weisleder @rweisleder.de · 02/06/2025

I love those easter eggs! Guess who's in the next frame...

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Roland Weisleder @rweisleder.de · 26/05/2025

NullPointerExceptions are in fact just a love letter from Java to us developers. Brought to us by @intellijidea.com #Java30WithIntelliJIDEA

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Roland Weisleder @rweisleder.de · 13/05/2025

Thanks for the great feedback (although only one person gave feedback) for my talk about #ArchUnit. People at #JCON, don't forget to give feedback!

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Roland Weisleder @rweisleder.de · 13/05/2025

Already have to leave #JCON. See you next year hopefully.

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Roland Weisleder @rweisleder.de · 13/05/2025

People at #JCON, at 14:30 you have several interesting options. But if you want to see how you can untangle your spaghetti code and if fixing failing tests on a big cinema screen is interesting to you, then attend my talk at cinema 5.

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Roland Weisleder @rweisleder.de · 28/04/2025

As a bank customer I want to be notified one hour after a failed contactless card payment So that I ... know that I did the right thing by inserting the card without getting distracted by an instant notification I wouldn't read anyhow? Or what was the user story for this notification?

Android notification about a failed contactless card payment and the suggestion to insert the card

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Roland Weisleder @rweisleder.de · 28/04/2025

@jcon.one Looks like you should visit a Java conference to learn how to avoid NullPointerExceptions 😜

dialog with a Java NullPointerException at the homepage of @jcon.one

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Roland Weisleder @rweisleder.de · 10/04/2025

A @kevlin.bsky.social in Berlin saying "Train service is interrupted due to computer restart" via blog.fefe.de?ts=99090c94

A digital display board of the Berlin S-Bahn that says in German “Train service is interrupted due to computer restart”

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Roland Weisleder @rweisleder.de · 09/04/2025

Sorry, I meant the consumers of starters. For a spring hello world: Should I explicitly depend on spring-boot, spring-boot-autoconfigure, spring-web etc. or is spring-boot-starter-web enough? Where to draw the line? Or should starters just be for starting until we know what we really depend on?

source code of a hello world application built with Spring Boot

dependency tree of the maven artifact spring-boot-starter-web

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Roland Weisleder @rweisleder.de · 05/02/2025

I guess my students have learned how projects really work: A perfect plan is useless if you realize too late that the real work is still ahead.

A line chart titled "Time spent per task" compares planned vs. actual hours per week over a 16-week period. The planned hours remain stable, while the actual hours spike dramatically around week 10. After the spike, actual hours stay consistently higher than planned.

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Roland Weisleder @rweisleder.de · 05/02/2025

Fortune Cookies? In Germany we eat Grumpy Cookies.

A box of 'STINKSTIEFEL' grumpy fortune cookies with sarcastic messages in German, featuring black cookies and a grumpy face illustration.

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Roland Weisleder @rweisleder.de · 30/12/2024

Tell me your office infrastructure is old without telling me your office infrastructure is old.

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Roland Weisleder @rweisleder.de · 25/11/2024

Okay, today I tried to stay as far away from the IDE as possible to escape the predicted off-by-one error. And then I arrived at the hotel. Guess who took the elevator to the wrong level?

Elevator in a hotel with a sign with room numbers per level

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Roland Weisleder @rweisleder.de · 25/11/2024

Time to grab some popcorn 🍿 before my talk starts @ JUG Paderborn

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Roland Weisleder @rweisleder.de · 25/11/2024

Starting my last trip this year with 3 stops in 3 days. JUG Paderborn: talking about ArchUnit University Dusseldorf: talking to CS students about software development in practice (legacy systems everywhere!) Software Crafters Dusseldorf: talking about Java and OOP

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Roland Weisleder @rweisleder.de · 22/11/2024

Just saw this sign at an institute for Computer science... That might explain the quality of our source code documentation. In English: "The sign. The signs."