Tagir Valeev
@tagir-valeev.bsky.social
📤 374
📥 29
📝 76
Work at JetBrains. Java Champion. Check my Java book:
https://mng.bz/671p
Girls’ Day at the JetBrains office in Munich, Apr 23rd. The registration is open here:
www.girls-day.de/.oO/Show/jet...
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Angebot: Ein Tag in der Welt der Softwareentwicklung
München | 23. April 2026, 10:00 | JetBrains GmbH, München mit Ekaterina Popova
https://www.girls-day.de/.oO/Show/jetbrains-gmbh/ein-tag-in-der-welt-der-softwareentwicklung
7 days ago
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Today we had a fire alarm in the office. A colleague wrote to a Slack channel 'Fire alarm in the office building', to start a thread if somebody knows any details.
18 days ago
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Just seen on a code review: > .groupBy({ it.second }, { it.first }) People may think it's short and concise. I think, it's cryptic and unreadable. You have to go several lines above and find `to` inside one of previous lambdas to finally understand what is `it.first` and what is `it.second`.
about 1 month ago
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Fun with
#Kotlin
: a pair of parentheses may cost you a lot!
about 2 months ago
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In today crazy
#Java
series: this code works (with Java 25): <T extends Integer> void test(T t) { t++; //t+=1; IO.println(t); } void main() { test(10); } But if you replace t++ with t+=1, it stops working! Main.java:3: error: incompatible types: int cannot be converted to T
3 months ago
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Had a talk about JSpecify and IntelliJ IDEA on Coffee + Software channel
www.youtube.com/live/K9QIYZM...
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Nullability, JSpecify, and IntelliJ with Andrei Kogun and Tagir Valeev
YouTube video by Coffee + Software
https://www.youtube.com/live/K9QIYZMJMV0?si=iZ9yGWtc2cWeuwVL
3 months ago
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Nice commit
github.com/stack-auth/s...
3 months ago
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reposted by
Tagir Valeev
IntelliJ IDEA, a JetBrains IDE
3 months ago
The IntelliJ IDEA 2025.3 release has landed! This version brings several significant updates, all of which are described and demoed on our What’s New page. Check it out! 👇
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What's New in IntelliJ IDEA 2025.3
Explore IntelliJ IDEA's latest features and updates to elevate your professional Java and Kotlin development experience.
https://www.jetbrains.com/idea/whatsnew/
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@briangoetz.bsky.social
are you really this old? 😱
3 months ago
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Will you expect this code to be JSpecify-compliant? If not, then how to fix it? @NullMarked public final class Demo { List<String> removeNulls(List<@Nullable String> input) { return input .stream().filter(Objects::nonNull).toList(); } }
3 months ago
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1
reposted by
Tagir Valeev
Sébastien Deleuze
4 months ago
Don't miss my new blog post in the Road to GA series to learn how the Spring team empowers Spring developers to make their Spring Boot 4 application null-safe, to reduce or remove the risk of NullPointerException and to solve "the billion dollar mistake"!
spring.io/blog/2025/11...
#spring
#java
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Null-Safe applications with Spring Boot 4
Level up your Java code and explore what Spring can do for you.
https://spring.io/blog/2025/11/12/null-safe-applications-with-spring-boot-4
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A user reports wrong highlighting in IntelliJ IDEA: the code is red, but both javac compiler and ecj compiler compile the code successfully, using any version of compiler. Next you read the spec and realize that IntelliJ IDEA behavior is correct, and both compilers are wrong. Weird feeling.
4 months ago
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Days since I mixed 'ExpressionUtils' and 'ExceptionUtils': 0
4 months ago
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Is it official now to call the taskbar notification area as 'tray'? I remember Raymond Chen saying that this is wrong 🤔
devblogs.microsoft.com/oldnewthing/...
5 months ago
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Fixed a static analysis warning in a Java file in the repo . . . It was a demonstration Java file used to onboard users and teach them about IntelliJ IDEA inspections and quick-fixes. The warning was there to illustrate how inspections work 🤦
5 months ago
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TIL: In
#Java
, List.subList() and List.reversed() are implemented smartly. You may call these methods as many times as you want and in any order, but you don't get a long chain of references which leads to StackOverflowError. The longest chain of views is two: reversed -> subList -> original list.
5 months ago
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Implemented Comparator.min/max for the Java standard library. Should be available since Java 26. ❌comp.compare(a, b) >= 0 ? a : b ✅comp.max(a, b)
bugs.openjdk.org/browse/JDK-8...
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https://bugs.openjdk.org/browse/JDK-8357219
5 months ago
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reposted by
Tagir Valeev
Mark Reinhold
6 months ago
Java 25 / JDK 25: General Availability:
mail.openjdk.org/pipermail/jd...
Features:
openjdk.org/projects/jdk...
Downloads:
jdk.java.net/25/
#Java25
#JDK25
#OpenJDK
#Java
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Java 25 / JDK 25: General Availability
https://mail.openjdk.org/pipermail/jdk-dev/2025-September/010483.html
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reposted by
Tagir Valeev
IntelliJ IDEA, a JetBrains IDE
6 months ago
Java 25 LTS is here! 🚀 Ready to tap into the latest
#Java
features?
#IntelliJIDEA
supports Java 25 from day one. Let’s dive into what’s new and how your IDE has you covered! 👇
#Java25IntelliJIDEA
jb.gg/r70wns
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Java 25 LTS and IntelliJ IDEA | The IntelliJ IDEA Blog
Full support for Java 25 is available in IntelliJ IDEA!
https://jb.gg/r70wns
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JetBrains AI Assistant is quite useful for adding Maven dependencies. Take care, though, to update the versions to the latest, as its learning set is somewhat outdated. To update the version, invoke good old code completion.
6 months ago
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reposted by
Tagir Valeev
Anton Arhipov
6 months ago
Looks like today is the day for JDK25!
openjdk.org/projects/jdk...
#java
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JDK 25
https://openjdk.org/projects/jdk/25/
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Yesterday during dinner with Javazone speakers, I asked JetBrains Kineto to create an app to check whether a number is prime and show factors if it's not. It took a single prompt and about 30 minutes. It deploys the app automatically. Now I have my very own prime checker 😁
6 months ago
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Josh's talk was actually very hot 🔥
#JavaZone
6 months ago
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reposted by
Tagir Valeev
IntelliJ IDEA, a JetBrains IDE
6 months ago
🔄 Just starting to explore JSpecify or thinking of migrating from another nullability library? Come chat with
@tagir-valeev.bsky.social
and the team behind the JSpecify support in IntelliJ IDEA – you’ll find them at the
@jetbrains.com
booth at
@javazone.bsky.social
2025!
add a skeleton here at some point
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Java 24 is three times bigger than Java 8. That's the fact, that's simple math.
@starbuxman.joshlong.com
on
#JavaZone
6 months ago
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reposted by
Tagir Valeev
Marit van Dijk
6 months ago
In person
@docker.com
help from
@shelajev.bsky.social
at
@javazone.bsky.social
- Thank you!
#JavaZone
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What people see: new modern API to write class files. What I see: missing semicolon at line 8.
@rafaelcodes.bsky.social
at
#JavaZone
.
6 months ago
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reposted by
Tagir Valeev
IntelliJ IDEA, a JetBrains IDE
6 months ago
Good morning
@javazone.bsky.social
2025! Swing by the
@jetbrains.com
booth to see what’s new in IntelliJ IDEA 2025.2. 🎤 Don’t miss
@maritvandijk.bsky.social
’s talk, “Be more productive with IntelliJ IDEA”, at 10:20 am, where she’ll share tips to boost your workflow.
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If you like to chat about Java or IntelliJ, catch me near JetBrains booth on
#JavaZone
.
6 months ago
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get! get! get! get! get!!!
#Java25
7 months ago
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I like how
@briangoetz.bsky.social
uses type nullability markers ? and ! in an unrelated discussion without even explaining them, like if it's already well-known thing that exists in the language for a long time 🙂
7 months ago
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As named constructors are not possible in
#Java
, some non-public constructors in OpenJDK contain bogus parameter, just to differentiate them from other constructors.
7 months ago
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reposted by
Tagir Valeev
IntelliJ IDEA, a JetBrains IDE
7 months ago
“Sudo, Make Me a Sandwich! – Live Coding With Agentic AI in IntelliJ IDEA” by
@antonarhipov.bsky.social
is now live:
youtu.be/1cx8vDJYi74
Watch Junie, JetBrains’ coding agent, in action and see how far AI can go in dev workflows.
#IntelliJIDEAConf
0
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reposted by
Tagir Valeev
Donald Raab
8 months ago
I've wanted to buy "100 Java Mistakes..." by
@tagir-valeev.bsky.social
for a while. Done 👍. Tagir knows so much about Java, and I'm sure I've made many of these mistakes. I'm looking forward to reading this now. 🙏
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Using AI slows down experienced developers?
metr.org/blog/2025-07...
8 months ago
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Asked JetBrains Junie to implement Stream.takeWhile support in our dataflow analysis. It implemented it, and the tests I wrote beforehand are passed. However, it just reused the Stream.filter implementation. Apparently, I needed better tests. Still, it's a good start, not complete garbage.
8 months ago
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If you have a CPU-intensive computation which moves/copies data between HashSets a lot, it may make sense to enumerate all your objects (map them to consecutive integers) and move to BitSets instead, mapping back at the end. They are waaaay faster.
8 months ago
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I'm going to visit JVM LS this year! See ya there!
add a skeleton here at some point
8 months ago
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reposted by
Tagir Valeev
Sharat (Shar) Chander - 🟦🌊
8 months ago
One of my top 3 highlights this year thus far was being invited by the
@jetbrains.com
@intellijidea.com
team to celebrate
#30YearsOfJava
. The
#Java
story is rooted in both ongoing technical innovation & community participation. My thanks to
@maritvandijk.bsky.social
who made this all possible.
add a skeleton here at some point
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reposted by
Tagir Valeev
Sharat (Shar) Chander - 🟦🌊
9 months ago
#Java
peers...the 2025
@intellijidea.com
Conference is around the corner (June 3-4)! There's still time to register for this FREE virtual event:
jb.gg/c463w8
Hear from host
@maritvandijk.bsky.social
and me as we kick things off to celebrate 30 YEARS OF JAVA!
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IntelliJ IDEA Conf 2025 | June 3-4, 2025
We invite you to join us for IntelliJ IDEA Conf 2025 and gain insights from industry leaders and experts.
https://jb.gg/c463w8
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TIL: In
#Java
format strings, you can specify indentation to a single percent character.
9 months ago
0
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Kinda cool
#Java30Years
#JetBrains
www.youtube.com/watch?v=kHyb...
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30 Years of Java
YouTube video by IntelliJ IDEA, a JetBrains IDE
https://www.youtube.com/watch?v=kHybgBHqL2A
9 months ago
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Here's how the analytics for a single flaky test looks like inside the IntelliJ project.
9 months ago
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reposted by
Tagir Valeev
10 months ago
Manchmal sind es die kleinen Dinge, die einem das Leben versüßen oder auch 100.
@bahn.de
@tagir-valeev.bsky.social
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reposted by
Tagir Valeev
JetBrains
10 months ago
🤗 Mellum is now open source on
@hf.co
! It’s a focal model that is small, efficient, and made for one thing: code completion. ⚙️ Trained from scratch by JetBrains. 🌱 First in a growing family of dev-focused LLMs. 🔗
jb.gg/hi_mellum
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The correct answer is counter-intuitively, Outer2.foo. Normally, classes and variables have separate namespaces in Java, so importing class and importing variable (static field) with the same name does not produce an ambiguous import.
add a skeleton here at some point
11 months ago
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Ok, here's my solution. Full of warnings, of course, but who cares about warnings? void main() { O<O<O>> O = O<O>::<O>O; } interface O<T> { void use(O c); default <C> void O() { } }
add a skeleton here at some point
11 months ago
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Provide the declaration of the O type, so this statement could be a valid
#Java
statement: O<O<O>> O = O<O>::<O>O;
11 months ago
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reposted by
Tagir Valeev
Benjamin Marwell ☕
11 months ago
Well, I didn't fall for Mistake #11 from
@tagir-valeev.bsky.social
's book, but quite something similar: Jackson Objects are both mutable AND return the updated self. I took it for being a copy-then-modify-Operation and used the original value elsewhere - which was modified, too. 😬
#java
#mistakes
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What is the output of the following Java code? A: Outer.Inner.foo B: Outer2.foo C: Compilation error D: Runtime exception (No idea if it's possible to post a poll here)
11 months ago
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