This article explains the internal mechanics of Java virtual threads, the role of Continuation, pinned threads, and carrier threads, and provides concrete monitoring techniques using JVM flags, JFR events, and framework-specific considerations for Helidon and Quarkus.
GraalVM Native Image now supports Native Memory Tracking (NMT), allowing developers to monitor off‑heap memory allocations, compare Java and native execution, integrate with JFR, and assess performance impact through detailed reports and experimental events.
This article explains how to use Java Flight Recorder (JFR) and JProfiler for low‑overhead, production‑grade performance analysis, covering JFR advantages, process discovery, file generation commands, JProfiler features, memory and CPU profiling techniques, and includes practical code examples.
This article explores the evolution of continuous performance profiling, explains why traditional tracing falls short, and details a series of optimizations—including batch processing, object‑reference serialization, aggregation insertion, and multi‑chunk handling—to dramatically reduce memory usage and speed up Java Flight Recorder analysis using async‑profiler and flame graphs.
JDK 20, released in March 2023, introduces a suite of security enhancements—including new exception constructors, expanded algorithm service attributes, stricter defaults for DTLS 1.0 and ECDH suites, performance‑boosting intrinsics for ChaCha20, Poly1305, MD5 and ECC, as well as new Java Flight Recorder events for tracking security properties—providing developers with stronger defaults and better observability.
The article analyzes a weekend outage of a Spring Boot microservice where all HTTP requests timed out, tracing the root cause to Caffeine's synchronous cache eviction lock being blocked by a long‑running compute operation, and proposes using AsyncCache with a dedicated thread pool to avoid similar contention.
Bisheng JDK is Huawei's customized OpenJDK distribution offering high‑performance, production‑ready Java runtime optimized for ARM, compatible with Java SE 8, supporting Linux/AArch64, and featuring JFR and a fast serializer with specific JVM options.
jcmd, introduced in JDK 7, is a powerful built‑in Java diagnostic tool that lets you send commands to running JVMs, replace utilities like jstack and jmap, and perform tasks such as listing processes, printing thread stacks, retrieving heap information, and using Java Flight Recorder.
Alibaba’s Dragonwell JDK 8.0.0‑GA, now GA‑ready for production, syncs the latest OpenJDK 8u212‑b04 updates, adds security patches, fixes critical Alibaba‑specific bugs, and introduces proprietary features such as JWarmUp, JFR enhancements, and the upcoming ElasticHeap, with detailed installation steps and performance results.
The article examines Java 11’s long‑term support status, key enhancements like ZGC, Flight Recorder, HTTP/2 client, TLS 1.3, and numerous JEPs, explaining why engineers and IT decision‑makers should consider upgrading to leverage performance, security, and productivity gains.
