Michael Simons
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rotnroll666.bsky.social
Michael Simons
@rotnroll666.bsky.social
1.9K followers 280 following 880 posts
👨‍👩‍👦‍👦👨🏻‍💻🚴🏻 – Father, Husband, Developer, Athlete. Author of Spring Boot Buch, and DuckDB in Action with Manning. Java champion working at Neo4j on various integrations within the JVM ecosystem.

More: https://michael-simons.eu
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rotnroll666.bsky.social
#Neo4j #embedded on #Java 25 and I find that #GoL actually quite relaxing…

gist.github.com/michael-simo...
October 15, 2025 at 8:45 AM
rotnroll666.bsky.social
Gelesen / Read: James Muldoon, Mark Graham, Callum Cant: Feeding the Machine. Hinter den Kulissen der KI-Imperien

This book kind of blew me out of the water.

More in the commit message linked below

codeberg.org/michael-simo...
A table in the restaurant coach in DB Bahn. A plate with rice and curry, and a glass of beer. Also, the book "Feeding the machine" of which I speak in the post.
September 24, 2025 at 2:17 PM
rotnroll666.bsky.social
While I do like idea about #JSpecify for #Java, here's my reason number one not to ship in one of my libraries as dependency until someone forces me… The annotations' retention policy is runtime time, hence the lib ships with your lib and than this obviously is gonna happen…
Screenshot showing the enforcer plugin breaking the build because Specify 0.3.0 and 1..0.0 don't converge.
September 10, 2025 at 1:23 PM
rotnroll666.bsky.social
Some random pictures from my phone of recent months. Enjoy.
July 6, 2025 at 3:27 PM
rotnroll666.bsky.social
The #Neo4j #JDBC Driver will soon learn to export Graph data as #JSON…

Would you consider that useful?
Screenshot of code reading nodes and relationships from Neo4j straight forward as JSON objects
July 3, 2025 at 12:25 PM
rotnroll666.bsky.social
Nope. Prices dropped significantly… and look at the images wrt money saving.

First is 2024, second 2025.
Orange line is how we role, blue line is what we theoretically needed to import… Read numbers: Amount we paid / should have paid, Green numbers: Money we got back respectively saved.
July 2, 2025 at 12:52 PM
rotnroll666.bsky.social
We got a battery in February, and while we didn't import a relevant amount of power, we still export way more than we can use…
July 2, 2025 at 12:50 PM
rotnroll666.bsky.social
I think just in time before the heat wave will make this at least for me impossible, I really crashed the #HellaHamburgHalfmarathon finishing 404 total, and 19th my age group with about ~18000 participants… #Happy as I am really not made for running with anything over 20°…
My in front of a large poster of the Hamburg Halfmarathon, holding up my medal and a small display showing the official time of 1:33:41…
June 29, 2025 at 12:05 PM
rotnroll666.bsky.social
You don't need a lot of tooling for a quick sanity check if you expose only what you want to expose from a #Java package. Generate your #Javadoc and see what it sees and publishes. Its default inclusions are just spot on.
Screenshot of the Javadoc page of the root package of the Neo4j JDBC driver. Package contains many more classes with package private visibility, which ofc don't show here.
June 25, 2025 at 8:14 AM
rotnroll666.bsky.social
Everyone should have a Big-Data-Slayer right at their disposal with local compute.

#DuckDB #BigData #DoomTDA
A Doom Slayer rubber duck in front of a white Mac keyboard.
June 6, 2025 at 9:36 AM
rotnroll666.bsky.social
Always watching… #Java #Duke #30YearsOfJava
A Java Duke next to my workstation, and by coincidence, the beautiful limited edition of LP From Zero that arrived a day ago.
May 23, 2025 at 8:51 AM
rotnroll666.bsky.social
Quite happy to see my face as part of such an illustrious list of fine folks interviewed by @entwicklerde.bsky.social for #JavaMagazin about 30 years #Java.
Picture of a page of JavaMagazin with 13 renowned Java experts.
May 17, 2025 at 1:42 PM
rotnroll666.bsky.social
30 years of #Java. Thank you, @sharatchander.bsky.social for giving me this shirt. I think, I pushed my first Java program to production in 2003, so I have been around for a bit. Back then, my beard wasn't that gray…
Self-portrait showing my bearded chin at the top left, and mostly a black shirt with the famous Java Logo and a 30 years emblem.
May 15, 2025 at 8:32 AM
rotnroll666.bsky.social
I think I am at the right time and place at @jcon.one with @hansolo.eu
Title of a talk: we hate code.
May 14, 2025 at 11:30 AM
rotnroll666.bsky.social
Getting the real EJBs at #Jcon
Free coffee by IBM. And a sign that the code is basically not a palace of the sky airplane and just normal business courtesy.
May 13, 2025 at 9:08 AM
rotnroll666.bsky.social
August 2022. Was awesome.
Bike in front of a giant fish fountain. Strava stats.
May 12, 2025 at 8:24 PM
rotnroll666.bsky.social
I picked this style in my "DuckDB in Action" book

Too bad I forgot to use proper symbols, such as ⋉ and ⋊.
Visualising outer joins, an excerpt from DuckDB in Action.
May 12, 2025 at 1:44 PM
rotnroll666.bsky.social
Sorry not sorry.
Drake meme: Top says "Enterprise grade code generator...", bottom: "Enterprise grade Al agentic Co-Pilot"
May 1, 2025 at 10:02 AM
rotnroll666.bsky.social
45… Never felt better.

40plus, tap in.
A running shot doing the Maasmechelen Nationalpark Halve Marathon trail.
April 26, 2025 at 4:02 PM
rotnroll666.bsky.social
Mood: "End of the road" like.
Black and white image of a body of water (the Oosterschelde) making up about 3/4 of the image. A wooden pole in front, in the water some ruins (I think a bunk structure).
April 24, 2025 at 5:06 PM
rotnroll666.bsky.social
#Java 24, avoid import #tariffs like a pro with #JEP 458, 476 and 477…
A screenshot of a Java program that uses the Neo4j JDBC driver to read records from a database, 3 panes, left to right: * On the class path, listing individual imports * On the module path, using preview feature module import declaration (JEP 476), omitting individual imports * On the module path, as implicit declared class, omitting the the java.base import (there by default), and java.sql (required by neo4j jdby anyway)
April 8, 2025 at 2:29 PM
rotnroll666.bsky.social
The weather? Stellar! Even close on being to hot at the end and I am pretty sure I got sunburned in the UK in freaking April.

Lovely day, I am happy.
My in my Brighton marathon finisher shirt holding up the medal, in front of the sea and the i360 thingy.
April 6, 2025 at 2:19 PM
rotnroll666.bsky.social
Playlist for today #BrightonMarathonWeekend #running
Screenshot of Apple Music displaying Queens Brighton Rock prominently.
April 6, 2025 at 6:24 AM
rotnroll666.bsky.social
German pieces from LaTeX (Spring Boot Buch), english DuckDB Book, AsciiDoc, type set with whatever process idk…

The way Manning sets the annotation is quite nice I think. Straight from the AsciiDoctor ones…
Screenshot Spring Boot Buch Screenshot DuckDB in Action
February 7, 2025 at 12:46 PM
rotnroll666.bsky.social
Early January 2018… In which I spoke about #Spring Boots "Magic" at #rheinJUG in Düsseldorf and explained auto configuration… A picture that I really like.

#Java
Me in the lower right corner in front of several blackboards with a project whiteboard in front showing one of my slides "It's a kind of magic?" Quoting a very good movie from 1986 and a screenshot of the music video with the song of the same name.
January 25, 2025 at 5:23 PM