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What jstack Misses When Your Java Service Uses Virtual Threads

Take a Spring Boot service with virtual threads enabled, a HikariCP pool of 10 connections, and roughly 5,000 requests in flight. Latency is climbing. You grab a thread dump and find 43 platform threa

maschiojv.hashnode.dev

Daisuke Masuda4d ago · 21 min read

Java 8/11 to Java 21, 25, or 27: A Practical Migration Guide

An engineering guide to upgrading an existing Java system without turning every improvement into a prerequisite. Version and support information reviewed on October 18, 2026. The first successful star

daisuke.masuda.tokyo

Mihai_LeanZeroOct 3 · 49 min read

Jira Data Center heap size and JVM tuning for a Cloud migration: setenv.sh and JCMA

Jira Data Center heap size and JVM tuning for a Cloud migration: setenv.sh and JCMA Key takeaways END STATE: a Jira Data Center 11.3 cluster on Java 21 whose heap is sized from your own GC log and At

leanzero.hashnode.dev

Mihai_LeanZeroOct 3 · 59 min read

Confluence heap size for a Cloud migration: Data Center memory settings, Synchrony, CCMA

Confluence heap size for a Cloud migration: Data Center memory settings, Synchrony, CCMA Key takeaways END STATE: a Confluence Data Center 10.2 cluster whose heap is calculated from your own GC log a

leanzero.hashnode.dev

Mayank MahajanOct 1 · 12 min read

Java Explained Simply: Why It Runs Everywhere (and How)

You're about to type System.out.println("Hello, World!");. Wait. Java has powered banks, e-commerce backends, Android tooling and big-data platforms for almost three decades. The reason isn't its synt

mayankdev.hashnode.dev

Doogal SimpsonSep 29 · 5 min read

Inside Java Card: JVM for Battery-Less Microcontrollers

Java Card powers billions of SIM and bank cards using a highly stripped-down JVM designed for battery-less microcontrollers. By flipping traditional memory management on its head, it stores the object

doogal.dev

Felipe MaschioSep 8 · 9 min read

Masking a JVM thread dump without breaking the analysis

A few weeks ago I posted on r/java about detecting virtual thread pinning from a plain thread dump. The technical discussion was fine. The comment that stuck with me had nothing to do with pinning: "t

maschiojv.hashnode.dev

Md Sharique AlamAug 26 · 11 min read

The exception in the hot loop — how a caught exception ate our CPU

A backend service I work on started returning 200s. Slow 200s. p99 for one specific endpoint had drifted from a few hundred milliseconds to over eleven seconds. Not a timeout — a legitimate, successfu

alambda.hashnode.dev

Murat KayanAug 14 · 14 min read

Project Valhalla Ships in JDK 28. Your Cloud Bill Won't Notice

Value classes are real. So are the constraints. This is a reality check for Java teams planning a 2027-2030 roadmap. Summary JEP 401 (Value Classes and Objects) went into mainline OpenJDK in July 202

betweenthelayers.hashnode.dev

Shraddha LandgeAug 11 · 7 min read

From javac to JVM

When we write a Java program, we write code that humans can understand. But a computer's CPU ultimately works with low-level machine instructions represented as bits (0s and 1s). So, what happens betw

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What jstack Misses When Your Java Service Uses Virtual Threads

Java 8/11 to Java 21, 25, or 27: A Practical Migration Guide

Jira Data Center heap size and JVM tuning for a Cloud migration: setenv.sh and JCMA

Confluence heap size for a Cloud migration: Data Center memory settings, Synchrony, CCMA

Java Explained Simply: Why It Runs Everywhere (and How)

Inside Java Card: JVM for Battery-Less Microcontrollers

Masking a JVM thread dump without breaking the analysis

The exception in the hot loop — how a caught exception ate our CPU

Project Valhalla Ships in JDK 28. Your Cloud Bill Won't Notice

From javac to JVM