René Schwietzke
@reneschwietzke.bsky.social
Tester and Java Developer, Passionate Performance Dude. Working at Xceptance. Public speaker #JVM #Java #Performance #QA #LoadTest #Quality #Testing
Mastodon: @[email protected]
Mastodon: @[email protected]
Liebe deutsche Politik, ohne großen Wurf, der allen wehtut wird es nix. Wir brauchen eine flexiblen Arbeitsmarkt, weniger Steuern und weniger Steuerregelwerk, aber mehr Kontrolle.
July 1, 2026 at 2:59 PM
Liebe deutsche Politik, ohne großen Wurf, der allen wehtut wird es nix. Wir brauchen eine flexiblen Arbeitsmarkt, weniger Steuern und weniger Steuerregelwerk, aber mehr Kontrolle.
"Das geht so nicht!"
"Das können wir nicht ändern."
Bekannte deutsche Sätze.
"Das können wir nicht ändern."
Bekannte deutsche Sätze.
June 22, 2026 at 5:59 AM
"Das geht so nicht!"
"Das können wir nicht ändern."
Bekannte deutsche Sätze.
"Das können wir nicht ändern."
Bekannte deutsche Sätze.
I am currently trying to turn my 100 different 1BRC implementations into a JDK release test suite. Who can sell me some time?
#youcannotbuytime
#youcannotbuytime
May 27, 2026 at 6:57 AM
I am currently trying to turn my 100 different 1BRC implementations into a JDK release test suite. Who can sell me some time?
#youcannotbuytime
#youcannotbuytime
Reposted by René Schwietzke
The "JFX Adopters Meeting" is a user conference where everyone presents their existing JavaFX application @ZEISS Meditec AG www.zeiss.com/meditec/en/n...
JFX Adopters Meeting 2026
www.zeiss.com
May 13, 2026 at 5:57 PM
The "JFX Adopters Meeting" is a user conference where everyone presents their existing JavaFX application @ZEISS Meditec AG www.zeiss.com/meditec/en/n...
Dear #DB, two long distance rides with two transfers each. Both rides on time, from end to end. Small delay from Cologne to Frankfurt but buffered off in Frankfurt. Thank you.
April 23, 2026 at 7:31 PM
Dear #DB, two long distance rides with two transfers each. Both rides on time, from end to end. Small delay from Cologne to Frankfurt but buffered off in Frankfurt. Thank you.
Just got the information that I have to pay 2 cents less in May per kWh electricity than April. 28.2 Cents. It is a dynamic price and set per month based on energy prices at EEX.
April 23, 2026 at 11:41 AM
Just got the information that I have to pay 2 cents less in May per kWh electricity than April. 28.2 Cents. It is a dynamic price and set per month based on energy prices at EEX.
If you are keen to learn how you can optimize data processing to save CPU and memory, basically money 💰, I invite you to my #JCON2026 talk: "Conquering a Billion Rows with Java Concurrency".
I am promising a "Wow, really?".
📅 Wednesday, 22 April 2026, 17:00 CEST
📍 Cinema 6, Cinedom Cologne, JCON
I am promising a "Wow, really?".
📅 Wednesday, 22 April 2026, 17:00 CEST
📍 Cinema 6, Cinedom Cologne, JCON
April 22, 2026 at 10:16 AM
If you are keen to learn how you can optimize data processing to save CPU and memory, basically money 💰, I invite you to my #JCON2026 talk: "Conquering a Billion Rows with Java Concurrency".
I am promising a "Wow, really?".
📅 Wednesday, 22 April 2026, 17:00 CEST
📍 Cinema 6, Cinedom Cologne, JCON
I am promising a "Wow, really?".
📅 Wednesday, 22 April 2026, 17:00 CEST
📍 Cinema 6, Cinedom Cologne, JCON
@infosec812.foojay.social.ap.brid.gy Hope to see you tomorrow at my talk.
April 21, 2026 at 3:18 PM
@infosec812.foojay.social.ap.brid.gy Hope to see you tomorrow at my talk.
Starting to in Cologne ... and it is raining cats and dogs.#jcon2026
April 19, 2026 at 8:20 AM
Starting to in Cologne ... and it is raining cats and dogs.#jcon2026
For an upcoming customer workshop, I am diving through JFR and all its features. Amazing. I am pretty sure that most Java developers don't know anything about that marvel.
Custom events and streaming are extremely useful but who knows that?
Custom events and streaming are extremely useful but who knows that?
April 8, 2026 at 6:18 AM
For an upcoming customer workshop, I am diving through JFR and all its features. Amazing. I am pretty sure that most Java developers don't know anything about that marvel.
Custom events and streaming are extremely useful but who knows that?
Custom events and streaming are extremely useful but who knows that?
Just asked Gemini to give me the future based on the present.
March 23, 2026 at 7:57 PM
Just asked Gemini to give me the future based on the present.
The new world of development: coming up with concepts, planning and coordinating their execution, and evaluating the results. Three-week sprints are now three-day sprints. Testing is essential, but coding is not. Requirements are critical, but coding is not.
I didn't expect that revolution. #AI
I didn't expect that revolution. #AI
March 9, 2026 at 6:22 PM
The new world of development: coming up with concepts, planning and coordinating their execution, and evaluating the results. Three-week sprints are now three-day sprints. Testing is essential, but coding is not. Requirements are critical, but coding is not.
I didn't expect that revolution. #AI
I didn't expect that revolution. #AI
Folks, I took the liberty to use #AI to rip out QuestDB from #JBake and also migrate to JDK 21 minimum. Opinions?
It renders jbake.org and my very own blog. Opinions? I would open a PR because QuestDB removal was on the list for a while.
github.com/rschwietzke/...
It renders jbake.org and my very own blog. Opinions? I would open a PR because QuestDB removal was on the list for a while.
github.com/rschwietzke/...
Build software better, together
GitHub is where people build software. More than 150 million people use GitHub to discover, fork, and contribute to over 420 million projects.
github.com
March 9, 2026 at 6:17 PM
Folks, I took the liberty to use #AI to rip out QuestDB from #JBake and also migrate to JDK 21 minimum. Opinions?
It renders jbake.org and my very own blog. Opinions? I would open a PR because QuestDB removal was on the list for a while.
github.com/rschwietzke/...
It renders jbake.org and my very own blog. Opinions? I would open a PR because QuestDB removal was on the list for a while.
github.com/rschwietzke/...
Just in preparation for #JCON2026. Join my talk on Wed, 22 April 2026 at 17:00 CEST.
Conquering a Billion Rows with Modern Java Concurrency
schedule.jcon.one/2026/session...
Conquering a Billion Rows with Modern Java Concurrency
schedule.jcon.one/2026/session...
February 18, 2026 at 5:43 PM
Just in preparation for #JCON2026. Join my talk on Wed, 22 April 2026 at 17:00 CEST.
Conquering a Billion Rows with Modern Java Concurrency
schedule.jcon.one/2026/session...
Conquering a Billion Rows with Modern Java Concurrency
schedule.jcon.one/2026/session...
Got stuck in Stockholm due to the Berlin airport being shut down for the day. The next attempt is Sunday.
February 6, 2026 at 11:05 AM
Got stuck in Stockholm due to the Berlin airport being shut down for the day. The next attempt is Sunday.
Greetings to all the great people I met at #jfokus. Thanks to the team of @jfokus.se for bringing us together again.
Safe travels and see you in Valhalla.
Safe travels and see you in Valhalla.
February 4, 2026 at 11:15 PM
Greetings to all the great people I met at #jfokus. Thanks to the team of @jfokus.se for bringing us together again.
Safe travels and see you in Valhalla.
Safe travels and see you in Valhalla.
February 4, 2026 at 9:48 AM
Regular developers without being product manager, developer, architect, tester and customer at the same time in one role will be so yesterday in a few months.
#jfokus
#jfokus
February 2, 2026 at 1:22 PM
Regular developers without being product manager, developer, architect, tester and customer at the same time in one role will be so yesterday in a few months.
#jfokus
#jfokus
On my way to @jfokus.se #jfokus See you in a bit.
February 1, 2026 at 5:00 PM
On my way to @jfokus.se #jfokus See you in a bit.
Antigravity is impressive. It sucks that it often strips all comments when refactoring code to fit a new feature.
Still experimenting around.
Still experimenting around.
January 26, 2026 at 7:46 AM
Antigravity is impressive. It sucks that it often strips all comments when refactoring code to fit a new feature.
Still experimenting around.
Still experimenting around.