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A Java rule‑engine experiences occasional 1‑2 second Young GC pauses after warm‑up, caused by dynamic promotion thresholds that trigger massive object promotion, and the article explains the root cause, demonstrates log analysis, and provides JVM tuning steps to eliminate the long pauses.
This article uses the Chinese Spring Festival story to explain Java's heap structure, young and old generations, large‑object allocation, and how excessive memory consumption leads to heap‑space OOM and stop‑the‑world garbage collection, providing code examples and practical mitigation tips.
The article explains the purpose of Survivor spaces in the JVM young generation, how they reduce premature promotion to the old generation, prevent fragmentation, and improve garbage‑collection efficiency by using two alternating survivor areas.
The article explains why the JVM uses a generational heap, describes the structure and operation of the young generation—including Eden and two Survivor spaces—illustrates object lifecycles, the role of Survivor spaces in preventing fragmentation, and outlines related JVM tuning parameters.