Generational ZGC, introduced in JDK 21, applies a weak generational hypothesis to split the heap into young and old regions, improving throughput by ~10%, reducing max pause times by 10‑20%, mitigating allocation stalls, and offering a phased adoption path via JVM flags and diagnostic tools.
This article explains the motivations for upgrading to JDK21, introduces Generational ZGC, details integration steps and monitoring setup, presents performance test results comparing ZGC and Generational ZGC, and outlines future plans for Java services at Zhaozhuan.
This article explains why the backend services were upgraded from JDK 8 to JDK 21, introduces the generational ZGC garbage collector, details its architecture, tuning parameters, integration steps, monitoring setup, and presents performance test results that demonstrate reduced allocation stalls, lower latency, higher throughput, and near‑zero GC pauses.
This article compares JDK 8, 17, and 21 using SPECjbb®2015 to evaluate throughput, latency, and memory consumption of G1, Parallel, and generational ZGC, highlighting significant performance gains and offering upgrade guidance for Java applications.
This article introduces Java 21’s major enhancements—including lightweight virtual threads and generational ZGC—provides code samples for creating virtual threads and enabling ZGC, demonstrates a Spring Boot 3.x application using record patterns, and explains how to monitor Java 21 services with Alibaba Cloud ARMS on ACK.
This article explores JDK 21's major features including virtual threads, generational ZGC, and new APIs, comparing their performance with traditional threading models and demonstrating practical implementations in Spring Boot.
The article introduces the official General Availability release of JDK 21, explains version naming conventions such as Alpha, Beta, RC, GA and LTS, and details its fifteen new features—including Virtual Threads, preview language enhancements, generational ZGC, and the removal of Shenandoah—while showing how to enable them.
