PermGen — 3 Technical Articles

Apr 7, 2025 · Fundamentals

Understanding Java's Method Area, PermGen, and Metaspace: What Changed in JDK 8?

This article explains the JVM method area concept, its implementation as the permanent generation in JDK 1.7, the limitations of that approach, and how JDK 1.8 introduced metaspace using native memory to improve class metadata management and avoid out‑of‑memory errors.

JVMJavaMetaspace

0 likes · 5 min read

Understanding Java's Method Area, PermGen, and Metaspace: What Changed in JDK 8?

Senior Brother's Insights

Oct 22, 2019 · Backend Development

Why Java 8 Replaced PermGen with Metaspace: A Deep Dive into JVM Memory Changes

This article explains how the JVM memory layout evolved from Java 7 to Java 8, detailing the shift from the permanent generation to Metaspace, the underlying spec versus HotSpot implementation, and the key JVM flags that control class metadata allocation.

Backend DevelopmentGarbage CollectionJVM

0 likes · 8 min read

Why Java 8 Replaced PermGen with Metaspace: A Deep Dive into JVM Memory Changes

Qunar Tech Salon

Jul 20, 2015 · Backend Development

Understanding Java Classloader Memory Leaks and PermGen Space Errors in Servlets

The article explains why repeatedly redeploying a Java servlet can trigger a java.lang.OutOfMemoryError: PermGen space, describes how classloader leaks occur, illustrates the problem with memory diagrams, and offers practical tips for detecting and fixing such leaks in backend applications.

JavaMemory LeakPermGen

0 likes · 7 min read

Understanding Java Classloader Memory Leaks and PermGen Space Errors in Servlets