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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....
All about performance in Java this week. The post Java Weekly, Issue 650 first appeared on Baeldung.
JMH is powerful, but deceptively easy to misuse. Here are the five pitfalls that silently corrupt your results — and exactly how to fix them. If you have spent any time optimising...
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...
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...
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...
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...
Records are one of the most genuinely useful additions to modern Java. They eliminate boilerplate, communicate immutability at the type-system level, and compose beautifully with s...
Есть такие анти‑паттерны, которые выглядят нормально и даже проходят код‑ревью, но тихо убивают производительность в горячих местах: - Конкатенация строк в циклах- String.format()...
Все сейчас пишут красивый, современный код: стримы, record DTO, функциональные цепочки. Применяют лучшие практики и никаких мутабельных аккумуляторов и ручных циклов.А потом код на...
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...
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...
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...
The MovieManager project has been updated to use JDK 25 and the AOT cache from project Leyden. Project Leyden is part of the OpenJDK project and provides cached linking and cached...
Java Flight Recorder (JFR) captures an enormous amount of detail about what your application is doing — but raw JFR files are only as useful as the tools you have to explore them....
Java 8, released by Oracle in March 2014, marked a significant milestone in the evolution of the Java programming language. This version introduced many new features to enhance the...
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...
Although Java 26 was released in mid-March this year, Java 25 is the latest LTS version available, and thus I chose to focus my attention on it in the first place. Irrespective of...
Hardwood, the project Gunnar Morling kick-started handling of Parquet files in Java, reached version 1. Its multi-threaded approach and zero mandatory external dependencies promise...
Java is one of the most widely used languages in the enterprise world. Many backend applications, banking systems, REST APIs, microservices, and enterprise platforms still run on v...
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...
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...
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...
Records are clean, expressive, and widely adopted — but in tight, allocation-heavy loops, they can pile invisible pressure on the garbage collector. Here’s what the profiler actual...
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