JVM

A comprehensive analysis of JFR (Java Flight Recorder) configuration system, usage methods, and event collection mechanisms. Covers JFR configuration system (global configuration, recording level configuration, JFC configuration files), multiple usage methods (JVM parameters, jcmd commands, JDK API, JMX), jfr tool analysis, event type classification and configuration applicability, as well as core changes and best practices from JDK 11 to JDK 25.

In-depth guide on how to quickly locate Java heap OOM using JFR (JDK Flight Recorder) with practical methods and underlying principles, covering JFR event analysis for three typical OOM scenarios, including key events such as Allocation Requiring GC, ZAllocationStall, ObjectAllocationOutsideTLAB, and techniques for collecting and analyzing them.

In-depth analysis of JVM error handling and diagnostic parameter design principles, implementation mechanisms, and version evolution, covering Heap Dump, Java heap OOM handling, error logging, and other key parameters with source code analysis and best practices.

An exploration of JEP 502’s StableValue API, which addresses the fundamental trade-off between immutability and initialization flexibility in Java. This article covers the API design, core implementation details including double-checked locking patterns, memory semantics, and JIT optimization strategies using the @Stable annotation.

A comprehensive deep-dive into JVM memory architecture covering heap memory, metaspace, thread stacks, and compressed object pointers. This technical analysis examines memory allocation processes, Native Memory Tracking, and provides practical examples using tools like jol, jhsdb, and JFR for understanding JVM memory management internals.

A deep dive into diagnosing and resolving a production JVM issue where applications would freeze during hourly log synchronization tasks. We explore safepoint analysis, JVM log output blocking, asynchronous logging implementation, and WebFlux optimization to achieve a complete solution.

Discover how OpenJDK 11 revolutionized JVM logging with its unified configuration system. Learn about essential log tags for GC analysis, class loading, and runtime compilation, plus master dynamic log configuration using jcmd for real-time performance tuning.