#jdk25 — Public Fediverse posts

Long if/else chains, repeated checks, unnecessary casts—classic #Java overhead. #Java25 adds #PatternMatching in switch, #RecordPatterns & guards, reducing boilerplate & improving type safety.
Mihaela Gheorghe-Roman explains: https://javapro.io/2026/04/28/pattern-matching-in-java-25-writing-cleaner-safer-faster-code/

#CleanCode #JDK25 @openjdk

#VirtualThreads changed significantly in JDK 24 & 25.

JEP 491 fixes monitor pinning, but new bottlenecks emerge in connection pools, rate limiters, and ThreadLocal caches that no longer behave as expected.

This #InfoQ article explains what to audit before adopting virtual threads, with guidance backed by a public benchmark.

🔗 Read more: https://bit.ly/4g8tmZl

#Java #JDK25 #JEPs

Built for Java teams that need reliable crash, memory, and runtime diagnostics from production workloads, #Eliya is suited to regulated environments where diagnostic artifacts support audits and incident analysis.

#InfoQ sat down with Fahim Farook, Principal Architect at Asymm Systems, to break down:
🔹 The core motivation behind Eliya
🔹 Managing policy boundaries
🔹 Smooth migration paths

Read the interview here 👉 https://bit.ly/4eIeQbc

#Java #OpenJDK #JDK25 #Observability #DevOps

Concurrency used to mean trade-offs: simplicity vs scalability. With #VirtualThreads, #Java challenges that. Mihaela Gheorghe-Roman explores benchmarks, migration steps, & what #JDK25 adds to #ProjectLoom. Still afraid of blocking I/O?

Dive in: https://javapro.io/2026/03/05/java-25-and-the-new-age-of-performance-virtual-threads-and-beyond/

@openjdk

Java 25 (JEP 520) introduces JFR Method Timing and Tracing, bringing deterministic bytecode instrumentation straight into the JDK. ☕

Here is a deep dive into how it works under the hood, the architecture, and the performance benchmarks:

🔗 https://ionutbalosin.com/2026/05/jfr-method-timing-and-tracing-deterministic-profiling-without-overhead/

#Java #JDK25 #Performance

Compact Object Headers - Reducing Java's Memory Footprint

Every Java object on a 64-bit JVM has carried a 16-byte header for decades. JEP 519 (JDK 25) cuts that to 8 bytes - by packing the class pointer into the mark word.

If you run JVMs in containers, serverless, or anything memory-constrained - this is the rare "free win."

👉 https://ionutbalosin.com/2026/04/compact-object-headers-reducing-javas-memory-footprint-by-22/

#Java #JVM #JDK25 #Performance #OpenJDK

Still writing instanceof + casts + nested conditionals? That’s legacy #Java. With #Java25, pattern matching simplifies type checks, switch logic, and data extraction.
Learn how with Mihaela Gheorghe-Roman: https://javapro.io/2026/04/28/pattern-matching-in-java-25-writing-cleaner-safer-faster-code/

#CleanCode #PatternMatching #JDK25 #JAVAPRO

Most memory problems aren’t leaks—they’re structural. Wanderson Xesquevixos breaks down how Compact Object Headers in #JDK25 shrink per-object overhead & why this finally matters in containers & #Microservices.

Benchmark-backed, no hype: https://javapro.io/2026/02/10/mastering-memory-efficiency-with-compact-object-headers-in-jdk-25/

#JVM @openjdk

Long if/else chains, repeated checks, unnecessary casts—classic #Java overhead. #Java25 adds #PatternMatching in switch, #RecordPatterns & guards, reducing boilerplate & improving type safety.
Mihaela Gheorghe-Roman explains: https://javapro.io/2026/04/28/pattern-matching-in-java-25-writing-cleaner-safer-faster-code/

#CleanCode #JDK25 @openjdk

Still writing instanceof + casts + nested conditionals? That’s legacy #Java. With #Java25, pattern matching simplifies type checks, switch logic, and data extraction.
Learn how with Mihaela Gheorghe-Roman: https://javapro.io/2026/04/28/pattern-matching-in-java-25-writing-cleaner-safer-faster-code/

#CleanCode #PatternMatching #JDK25 OpenJDK

Your #Java app didn’t grow—your heap did. Wanderson Xesquevixos digs into #JDK25’s Compact Object Headers and shows how a simple flag can cut committed heap by ~30% in object-heavy workloads.

Read before tuning GC again: https://javapro.io/2026/02/10/mastering-memory-efficiency-with-compact-object-headers-in-jdk-25/

#Java #JVM #Performance @openjdk

Good news for Java developers: Temurin JDK 25 for x64 Windows is now available in the Red Hat Customer Portal, giving you another supported, production‑ready option for running Java on Windows.
https://developers.redhat.com/articles/2026/03/06/temurin-jdk-25-now-available-red-hat-customer-portal
#java #jdk25

Concurrency used to mean trade-offs: simplicity vs scalability. With #VirtualThreads, #Java challenges that. Mihaela Gheorghe-Roman explores benchmarks, migration steps, & what #JDK25 adds to #ProjectLoom. Still afraid of blocking I/O?

Dive in: https://javapro.io/2026/03/05/java-25-and-the-new-age-of-performance-virtual-threads-and-beyond/

@openjdk

Most memory problems aren’t leaks—they’re structural. Wanderson Xesquevixos breaks down how Compact Object Headers in #JDK25 shrink per-object overhead & why this finally matters in containers & #Microservices.

Benchmark-backed, no hype: https://javapro.io/2026/02/10/mastering-memory-efficiency-with-compact-object-headers-in-jdk-25/

#JVM @openjdk

Got some time today to upgrade my application, bookLister, to using #Kotlin 2.3 and #JDK25 along with some general dependency upgrades. Does the app do anything yet? Nope (Just will give a status on its /healthcheck URI). It is up to date with the latest and greatest that's possible. You bet!

Java finally gets native superpowers.

Just published a new hands-on tutorial where we call ImageMagick directly from Java 25 using the Foreign Function & Memory API.
No JNI. No C glue. Just pure Java + Quarkus doing real image processing.

If you’ve wondered how Python calls fast C libraries… this is how Java does it now.

👉 https://www.the-main-thread.com/p/java-ffm-api-quarkus-imagemagick-tutorial

#Java #Quarkus #FFMAPI #ImageMagick #JDK25

Yay, one big step closer to the release of #IntelliJIDEA 2025.3! Check out the release candidate: https://blog.jetbrains.com/idea/2025/11/intellij-idea-2025-3-release-candidate/

#Java #JDK25 #Junit6 #SpringBoot4

Как прошёл Java Rock Stars Meetup в сентябре (и чего ожидать в декабре)

25 сентября в Москве прошёл Java Rock Stars Meetup, в котором было всё: доклады, холивары о будущем Spring в России и много нетворкинга. Пока готовился обзор прошедшего митапа, мы уже успели организовать новый и заключительный в этом году Java Rock Stars Meetup, который пройдёт 2 декабря в Москве в привычном месте — лофте Casa Picassa. Регистрируйтесь на митап

https://habr.com/ru/companies/axiomjdk/articles/969344/

#java #jdk25 #axiomjdk #axiom_jdk #митап #митап_в_москве #приглашение #обзор #spring #kotlin

Spring Boot 4.0.0 is available
https://spring.io/blog/2025/11/20/spring-boot-4-0-0-available-now

Build on Spring Framework 7.0.0, modularization of Spring Boot codebase, improved null safety with jspecify, first class support for Java 25

#springframework #springboot #java #jdk25 #web #data #jdk

Java 25: упрощённые исходники

Язык Java развивается. Не так давно вышла очередная версия, в которой, помимо всего прочего , вышло любопытное обновление языка ( JEP-512 ). Изменения, в язык внесенные, делают его более пригодным и удобным для обучения и написания коротких программ. В этой статье хочу рассказать о том, как это сделано. Для этого заглянем в компилятор и немного коснемся теории создания языков.

https://habr.com/ru/companies/axiomjdk/articles/952826/

#java #axiomjdk #компилятор #axiom_jdk #jdk25 #jep #java_25 #lts

What's new in Java 25 for developers
Review the stable and preview features in this new LTS release of Java
https://developer.ibm.com/articles/java-whats-new-java25/
#Java #JDK25 #Java25

Java 25's new CPU-Time Profiler (1) https://mostlynerdless.de/blog/2025/06/11/java-25s-new-cpu-time-profiler-1/
#Java #jdk25

Виртуальные потоки в Java: эволюция, практика, подводные камни

Привет! Меня зовут Денис, я руковожу группой R&D в Naumen Service Management Platform. В этой статье — разбор виртуальных потоков (VT) в Java: почему исторически обычные потоки упирались в I/O, как и зачем появились виртуальные потоки, что пошло не так в Java 21, что исправили в JDK 24–25, а также когда виртуальные потоки необходимы, а когда — лучше от них отказаться.

https://habr.com/ru/companies/naumen/articles/953262/

#виртуальные_потоки #java #jdk24 #jdk25 #project_loom #jep_491 #scoped_values #threadlocal #tomcat

​:java_logo:​ Java 25 ​:ablobcatbongokeyboard:​

void main() {
    IO.println("Hello, World!");

    var name = IO.readln("What is your name? ");
    IO.println("Hello " + name);
}

@sdkman any idea why 25-tem is the suggested default for macOS ARM but isn't included in the canidate list?

https://api.sdkman.io/2/candidates/java/darwinarm64/versions/list?installed=

The darwinx64 release is included. Both releases exist on the adoptium website.

#Temurin #JDK25 #sdkman

JDK 25 Security Enhancements
https://seanjmullan.org/blog/2025/09/23/jdk25
#Java #jdk25 #Security

What's new in Java 25 for developers
https://developer.ibm.com/articles/java-whats-new-java25/
#Java #jdk25 #java25