Facing massive FullGC alarms due to an oversized in‑memory cache, we leveraged Java’s String.intern() via a custom fastjson deserializer and a rewritten HashMap to deduplicate low‑entropy strings, slashing heap usage by over 1 GB while preserving functionality.
This article explains the Java constant pool concept, details how the String constant pool works in different JDK versions, demonstrates the effects of String.intern() with code examples, and discusses practical applications and pitfalls of using intern for memory optimization and synchronization.
This article explains Java’s constant pool architecture, the role of the String pool across JDK versions, demonstrates how String.intern() works with code examples, and shows how interning can dramatically reduce memory usage while also highlighting potential pitfalls.
This article explores the purpose and inner workings of Java's String.intern method, detailing how it interacts with the string constant pool across JDK versions, illustrating memory layout differences, code examples, and practical guidelines for when to apply intern for performance gains.
This article explains how excessive use of String.intern can enlarge the JVM's StringTable, causing the Young Generation Garbage Collection (YGC) to take longer, and provides a demo, code analysis, and practical tips for diagnosing and mitigating the slowdown.
This article explains why using Java's String.intern() can be hazardous by disproving three popular myths about its performance benefits, memory savings, and lifetime, and offers guidance on when (if ever) the method should be applied.
