Latest updates for Jvm Internals

Fresh curated links around JVM Internals are collected here so marketers can spot useful updates and turn timely ideas into posts faster.

Recent items include:

  • How the JVM Decides What to Compile: Inside the JIT Tier System and Profiling Pipeline
  • Past the JVM
  • Understanding Garbage Collection Pauses: Why Stop-the-World Still Happens and What the JVM Is Actually Doing

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javacodegeeks.com /1 week ago

How the JVM Decides What to Compile: Inside the JIT Tier System and Profiling Pipeline

A conceptual walkthrough of C1, C2, tiered compilation, and why the JVM’s optimizer knows more about your code than you do. Java is often described as a compiled language and an in...

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dev.to /1 month ago

Past the JVM

Learning Java got me thinking how exactly does things word under the hood.. I'm not talking about Java in Particular I'm mentioning programming in General how does a command I Writ...

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javacodegeeks.com /1 week ago

Understanding Garbage Collection Pauses: Why Stop-the-World Still Happens and What the JVM Is Actually Doing

A conceptual guide to safepoints, GC roots, and why even modern collectors like ZGC and Shenandoah cannot always avoid pausing your application. “Stop-the-world” sounds like a reli...

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javacodegeeks.com /1 month ago

ThreadLocal Is a Memory Leak Waiting to Happen With Virtual Threads — Here’s the Proof

ThreadLocal was designed for a world of 200 pooled platform threads living for the life of an application. Virtual threads create one fresh thread per task and never reuse them. Th...

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javacodegeeks.com /2 weeks ago

The Java Memory Model Explained: Happens-Before and Concurrency Semantics

There is a quiet assumption embedded in almost every line of Java ever written: that when one thread writes a value to a variable, another thread will eventually see it. That when...

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javacodegeeks.com /1 month ago

Reading JVM Safepoint Logs Without Going Mad: A Practical Stop-the-World Diagnosis Guide

JFR and async-profiler guides are everywhere. Safepoint logs — the raw output that tells you exactly why your JVM froze — are almost universally a footnote. This is the guide that...

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javacodegeeks.com /1 month ago

Virtual Thread Pinning: The Silent Performance Killer in Your Codebase

Virtual threads promise to make blocking I/O cheap. And they do — as long as they can actually unmount from their carrier when they block. The problem is that synchronized blocks p...

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javacodegeeks.com /1 day ago

Value Classes (JEP 401): When Records Aren’t Flat Enough for the JIT

How value classes differ from records — no identity, no heap header — where they outperform records in tight loops, and the Valhalla mental model in 300 words. Status check: As of...

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habr.com /1 month ago

JDK 27 Compact Object Headers: как сбросить до 30% кучи без кроссфита и жестких диет

Каждый Java-объект в HotSpot начинается со служебного заголовка размером 12 байт. В JDK 27 по умолчанию он сжимается до 8 — это JEP 534, финальный шаг внедрения Compact Object Head...

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blog.frankel.ch /2 weeks ago

Security Baked Into the JVM: why fork Apache River and OpenJDK?

The more distributed a system, the harder it is to secure. Code crosses JVM boundaries. Objects are serialized across trust boundaries. Third-party proxies run inside your process....

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javacodegeeks.com /1 month ago

String Deduplication Is On By Default in G1 — And Most Developers Don’t Know What It Does

A granular look at what the JVM is quietly doing with your strings at the native level, when that work genuinely saves you memory, and when it simply burns CPU for nothing. 1. Wait...

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javacodegeeks.com /1 month ago

How to Read a Flame Graph: A Practical Profiling Guide for JVM Developers

async-profiler demystified — learn to spot the hot frames, understand the stack, and fix what actually matters. Why Flame Graphs Beat Thread Dumps Let’s be direct: if your Java ser...

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javacodegeeks.com /1 month ago

Lazy Constants (JEP 531): JIT’s Best Friend You Haven’t Met

How ofLazy() unlocks constant-folding without static final, why it finally replaces double-checked locking, and what the numbers look like in practice. Every Java developer knows t...

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javacodegeeks.com /1 month ago

Java Virtual Threads Without Pinning

Virtual Threads, introduced as part of Project Loom, provide a lightweight concurrency model that enables Java applications to handle millions of concurrent tasks efficiently. Whil...

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javacodegeeks.com /2 weeks ago

Stop Using Virtual Threads for Everything: Performance Lessons Learned

When JEP 444 landed in Java 21 in September 2023, the reaction across the Java community was unusually enthusiastic. Virtual threads promised to solve one of the oldest pain points...

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javacodegeeks.com /2 weeks ago

Project Panama FFM API: Calling C Code Without JNI Hell

Java has always needed a way to call native code. Scientific computing, image processing, hardware drivers, cryptography libraries — the C ecosystem holds decades of production-gra...

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dzone.com /1 day ago

Differential Flamegraphs in Java in Jeffrey Microscope

In the first article, we got started with Jeffrey Microscope and learned to read a single flamegraph — the timeseries, search, tooltips, and the allocation and wall-clock variants....

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javacodegeeks.com /1 month ago

How to Read a Flame Graph: A Practical Profiling Guide for JVM Developers

Stop guessing where your Java app is spending its time. Here is everything you need to go from zero to actionable insight with async-profiler. You have a Java service that is slowe...

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infoq.com /1 month ago

OpenJDK News Roundup: Vector API, Compact Object Headers and G1GC as Default in JDK 27

There was a flurry of activity in the OpenJDK ecosystem during the week of May 18th, 2026, highlighting three JEPs elevated from Proposed to Target to Targeted and three JEPs eleva...

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feeds.feedblitz.com /1 day ago

How Does a Java Program Get Its Own Process ID

Learn how to retrieve the current Java process ID using ProcessHandle, RuntimeMXBean, and legacy approaches across different Java versions. The post How Does a Java Program Get It...

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rubystacknews.com /1 month ago

Understanding Ruby Proc Internals Through proc.c

Originally appeared on Weelkly Article – Linking Ruby knowledge from the most remote places in the world..May 26, 2026 Ruby’s elegance hides an extremely sophisticated runtime unde...

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dzone.com /1 month ago

Alternative Structured Concurrency

Java structured concurrency has been under development for a span of 5 years, weaving through 8 (!) distinct JEPs (JEP 428, JEP 437, JEP 453, JEP 462, JEP 480, JEP 499, JEP 505, JE...

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javacodegeeks.com /3 weeks ago

ZGC vs G1GC in Java 26: Which GC Should You Actually Use?

Every time a new Java release drops, the question surfaces again in Slack channels and pull-request threads alike: “Are we still on G1? Should we switch to ZGC?” With Java 26 landi...

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habr.com /1 day ago

Сериализация one-nio: от истоков к поддержке JDK 25

Привет, Хабр! В этой статье я расскажу об эволюции подсистемы сериализации one-nio — фреймворка для создания высоконагруженных сервисов, работающего в Одноклассниках с 2012 года. П...

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blog.frankel.ch

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dev.to

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feed.infoq.com

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feeds.feedblitz.com

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