Lukáš Petrovický

@triceo@home.social
32 Followers
141 Following
45 Posts
Java software developer.
Lives in Brno, Czech Republic.
Will not bring up politics unless in a reply to someone else.
Githubhttps://github.com/triceo
LinkedInhttps://www.linkedin.com/in/petrovicky/
LocationBrno, Czech Republic
Lukáš PetrovickýMay 3, 2023
TimefoldMay 3, 2023

Introducing Timefold, the exciting next chapter in #OptaPlanner's legacy! 🚀

Founded by Geoffrey De Smet and Maarten Vandenbroucke, we're here to take the project to new heights while offering seamless continuity for our community.

https://timefold.ai/blog/2023/optaplanner-fork

OptaPlanner continues as Timefold

Timefold Solver is the faster, Open Source fork of OptaPlanner. It's built by a dedicated Open Source company, co-founded by the OptaPlanner creator.

Timefold
Lukáš PetrovickýMay 2, 2023
Geoffrey De SmetMay 2, 2023

#OptaPlanner - the popular open source Solver AI - is my life's work. I created it 17 years ago and have been working on it ever since, including 9 years for Red Hat.

Today, I am forking my own project.

Meet #Timefold, the fork of #OptaPlanner 🚀

https://timefold.ai/blog/2023/optaplanner-fork/

OptaPlanner continues as Timefold

Timefold Solver is the faster, Open Source fork of OptaPlanner. It's built by a dedicated Open Source company, co-founded by the OptaPlanner creator.

Timefold
Lukáš PetrovickýApr 24, 2023
Mario Fusco 🇪🇺 🇺🇦Apr 24, 2023
#Lombok is the perfect demonstration that the simple fact that is technically possible to do something neither implies that is a good idea nor represents a good enough reason to actually do it.
Lukáš PetrovickýApr 20, 2023
Nicolai ParlogApr 20, 2023

I'm sure you've encountered the annoying situation where you chain constructors in #Java but can't smoothly call the right one with `this(...)` or `super(...)` because you need to do work before, which the compiler doesn't allow: no statements before `this`/`super`!

That's about to change - behold JEP 447: https://openjdk.org/jeps/447

JEP 447: Statements before super(...) (Preview)

Lukáš PetrovickýApr 18, 2023
Tagir ValeevApr 17, 2023
RT @joshbloch
This is your annual reminder that Math.abs(Integer.MIN_VALUE) is negative
Lukáš PetrovickýApr 7, 2023
Hacker News Apr 7, 2023

Is it my fault if you can’t handle the truth? (2019)

Comments

Is It My Fault You Can't Handle The Truth?

You can't handle it! In 2018 or 2019, I was introduced to the idea of hyper-rationality. I think it was under another name (to be g...

Lukáš PetrovickýMar 31, 2023
OpenJDKMar 31, 2023
Proposed to target JDK 21: JEP 444: Virtual Threads: https://openjdk.org/jeps/444 #jdk21 #openjdk #java
JEP 444: Virtual Threads

Lukáš PetrovickýMar 15, 2023
Dr David MillsMar 14, 2023
Every warning label is a story someone tells somewhere.
#electronics #warningsigns
Lukáš PetrovickýMar 11, 2023
Foojay.ioMar 11, 2023

Is #Java old and not evolving? Do you need to compile your #Java code before you can run it? Is #Java slow and insecure? Will your #Java application stop while memory cleanup is ongoing? Batting outdated ideas aside like flies, check out @frankdelporte on Foojay  Today.

https://foojay.io/today/9-outdated-ideas-about-java/

#foojaytip

9 Outdated Ideas About Java | Foojay.io Today

In this article, we want to look into some false assumptions and outdated ideas about Java based on early versions.

foojay
Lukáš PetrovickýMar 7, 2023
Mario Fusco 🇪🇺 🇺🇦Mar 7, 2023

When I get the typical support email saying:

"The customer does <absurd_thing_not_making_any_fucking_sense>, how can we make this work?"

my usual answer is:

"By showing them how the rewrite that thing in a more reasonable way"

and then we end up supporting the absurd thing 😭

×
Dr David MillsMar 14, 2023
Every warning label is a story someone tells somewhere.
#electronics #warningsigns
Show threadNixieMar 14, 2023
@Dtl From the creators of "pigtails are not handles"...
Show threadAndrew Lewis WorkshopMar 14, 2023
@Dtl reminds me of a conversation I had with a colleague once:
Them: "have you worked on these before?"
Me: "yes, a few times..."
Them: "I've got the lid off, any advice?"
Me:"Um..."
Them:"arghhhhh!"
Me:"the heat sinks are live, not grounded?"
Them:"thanks."
Show threadGraham Sutherland / PolynomialMar 14, 2023
@LewisWorkshop @Dtl shocked myself on a network appliance a while back due to this. they had a couple of TO220 packaged diodes bonded to a heatsink, and the tabs were at mains potential. gave me a dead arm for about an hour.
Show threadEndlessMasonMar 14, 2023
@Dtl We had budget for a sticker, but not a proper handle. sorry.
Show threadPhoenixSerenityMar 14, 2023
@Dtl I was telling a couple of galpals about warning labels a couple of weeks ago & how for every one that exists - someone did something quite stupid. That's why we have labels like: "Remove cap, before drinking." & "Open bag, before consuming."
Show threadLGsMomMar 14, 2023
@Dtl A story and a large settlement.
Show threadJoe UchillMar 14, 2023
@Dtl I suppose the sticker was cheaper than installing a handle.
Show threadSimon RichterMar 14, 2023
@Dtl this is missing a "Do not cover pressure relief breaking point with stickers" sticker on the side of the capacitor.
Show thread🇺🇦 haxadecimalMar 14, 2023
@Dtl The next time I design anything with a large aluminum electrolytic capacitor, I am definitely going to put labels like that on them.
Show threadDr David MillsMar 14, 2023
@brouhaha I think I will too.
Show thread🇺🇦 haxadecimalMar 14, 2023
@Dtl Avry makes printable round label sheets for ½in to 3in diameter. Maybe more, that was the result of a cursory search. I have a Silhouette CNC paper cutter, so I could use full-sheet label stock.
Show threadDave WeinsteinMar 14, 2023
@Dtl "If not handle why handle-shaped?"
Show threadPapá RobotMar 14, 2023
@Dtl or foot warmers
Show threadteddyMar 14, 2023
@Dtl ...and a market opportunity. i am going to make my fortune on handle-rated caps
Show threadChris BohnMar 14, 2023
@Dtl Every. Warning. Label.
Show threadDym SohinMar 14, 2023

@Dtl clearly rectifying a design flaw of not providing actual handle

> «dont tell me what to do, Cacy, you not my real handle»

Show threadComputeforloot Mar 14, 2023
@Dtl truth
Show threadjbrMar 14, 2023
@Dtl That one might sting a lot if it discharges on ya.
Show threadAlexey MerzMar 14, 2023
@Dtl But what could possibly go wrong?
Show threadTallawkMar 14, 2023
@Dtl
Every morning I read a safety rule from "The Book." The ones involving steam engines are always fun.
Once in a while I will remind my peeps that, "The rules are written in blood here. Every one of these has a story behind it."
Show threadGriff FerrellMar 14, 2023
@Dtl Could've been worse

My sister is a radiologist
Show threadCustard SmingleighMar 14, 2023
@Dtl @tjkendon
I used to be a Dell certified hardware repair guy, fifteen years ago. There used to be at least one 1U rack mount server model where the system board had a wire cage holding down a big capacitor in the middle of the board. After fielding so many RMAs for ripped off capacitors they decided it would be cheaper to MAKE the capacitor into a handle.
Show threadtjkendonMar 15, 2023
@Smingleigh @Dtl my first thought when I read this was "The heart wants what it wants."
Show threadKit BashirMar 14, 2023
@Dtl @ifixcoinops that looks like a mistake you can make only twice.
Show threadMartin Piper (he/him) 💙💛🌻💉Mar 14, 2023
@Dtl chonky death handle.
Show threadMartin Piper (he/him) 💙💛🌻💉Mar 14, 2023
@Dtl this is now my metal band name.
Show threadripperMar 14, 2023
@Dtl Well, you don't want to incapacitate the board.
Show threadDougN ​ 😷 Mar 14, 2023
@Dtl yup. Because somebody did.
Show threadQ McCallumMar 15, 2023

@Dtl That one story often leads to others:

"I'm sorry, you want us to print _what_ on a sticker? But why would ...? I mean, fine, here's the price tag and timeline, but ..."

Show threadJames GreenMar 15, 2023

@Dtl What'll they charge you with?

I'll see myself out...

Show threadsubtlepseudonymMar 15, 2023
@Dtl If the capacitor can't briefly hold and later discharge some leverage, is it really worth having?
Show threadfingerlessMar 15, 2023
@Dtl
Show threadLogan Five (aka John)Mar 15, 2023

@Dtl I used to have a coworker who was in a competition with his friends to get warning labels put on things. For example, he would contact shampoo companies and say he ate their grape shampoo and then, bam, warning label not to eat the shampoo.

When I see things like this, I wonder how far his pranks have reached.

Show threadAlex Poe Mar 15, 2023
@Dtl written in blood :)
Show threadBernard TyersMar 15, 2023
@Dtl That's excellent. If there was anything that shouldn't be used as a handle in a circuit board, i don't think you could choose anything worse than a cap!
Show threadDudeVotesMar 15, 2023
@Dtl
Heh!
Show threadBlueDot🇺🇦Mar 15, 2023

@Dtl I used to work at Union Pacific Railroad. Got to see their vast locomotive repair facility one time.

The walls had huge safety signs. Each had a generic slogan like "Safety is everyone's job," and then a name and a date. Nobody needed to ask what happened to that guy on that date.

Show threadCallistoMar 15, 2023
@Dtl I still really, really wish I'd saved the installation instructions from a piece of motorcycle luggage that reminded users not to attach it to the chain 🤦‍♂️
Show threadJohn Caveney woke is me🛠️Mar 15, 2023
@Dtl 😂😂
Show threadPeteMar 15, 2023

@Dtl

When my dad was a young electrical engineer in the 1950s, he'd been wondering whether overhead power lines had capacitance, and had the opportunity to find out when, leaving the safety of his office, he went out on site where a line had been taken down out of service and laid on the ground in a field. He touched his hand to the line and got an enormous jolt. I imagine actually most of the charge had already been grounded, and he was lucky to survive.

Show threadSharonbw stands with UkraineMar 15, 2023
@Dtl
My husband and I play a game called, “How stupid do you have to be to have caused this warning?!”
Show threadDawn Tåke 🏳️‍⚧️Mar 16, 2023
@Dtl
Reminds me of the phrase "OSHA rules are written in blood."
Show threadjujubeMar 16, 2023
@Dtl If you've ever heard the top of a large capacitor "pop" you'll respect capacitors from then on
Show threadeuroplus Apr 2, 2023
@Dtl
DO NOT
USE LARGE
HANDLE-LIKE
CAPACITORS
WHERE PEOPLE
EXPECT HANDLES
Show threadHanno ReinDec 5, 2024
@Dtl Bad UX design. People who know what a capacitor is don't need this label because they know it's a capacitor and not a handle. But it is also not useful for people who don't know what a capacitor is because they don't know what a capacitor looks like and thus don't know what not to use as a handle. Finally, reckless people who know what a capacitor is but still use it as a handle most certainly don't care about the label.
Show threadShadow HeartDec 5, 2024
@Dtl capacitors are always good for a laugh. 😈😈😈
Show threadMichael PorterDec 5, 2024
@Dtl I came across this one recently – In this case, it's a story *someone else* tells somewhere...
Show threadDr David MillsDec 5, 2024
@MichaelPorter that's pretty terrifying
Show threadMichael PorterDec 5, 2024
@Dtl That's what I thought - chances are 50/50 I'd be inclined to play with that thing if the sign wasn't there...
Show threadHelical = |⟩Dec 5, 2024
@Dtl ​​ <— me looking over at the legal forms I had to sign when buying chips from TI, which explicitly said I can’t build nuclear weapons with them
Show threadDr David MillsDec 5, 2024
@helical Did you build a nuke with them and ship it to TI with a note saying, "yes, I can!" ?
Show threadHelical = |⟩Dec 5, 2024
@Dtl I’m worried this is no different than a warning sign that says “DO NOT USE THESE AND GATES TO BUILD A NUKE” and somebody made them put up that sign lmao
Show threadTisha TigerDec 5, 2024
@Dtl Capacitors don't have to tell me what to... oops broken
Show threadJacketDec 5, 2024
@Dtl That sticker should not be legal. It's blocking the spot where the capacitor pops safely in case it becomes defect. If you block this it might pop by the bottom and release acid on the board.
Show threadDr David MillsDec 5, 2024
@jacket That capacitor didn't have a scored in vent. I also doubt if that cap went pop that a bit of paper would stop it.
Show threadColinDec 5, 2024
@Dtl @Xanthe *uses mounted CPU heatsink as a handle when mounting/moving motherboard around*
Good luck socket and CPU :3