Coder Trainee

Jun 29, 2026 · Backend Development

Java Performance Tuning in Practice (Part 6): End-to-End Case Study from Full GC to 200 ms Response

The article walks through a real e‑commerce order service where afternoon spikes caused response times to jump to 2‑3 seconds, Full GC to run every few minutes, and Metaspace to hit 99.9%, then demonstrates step‑by‑step analysis using monitoring, GC logs, jstat, jmap, and heap dumps, fixes a custom class‑loader leak, adjusts JVM flags, and achieves sub‑200 ms latency with no Full GC.