Java 8 - Permanent Generation Support - Alernative

Question

Support to PermGen Pool has now been removed in Java 8. What is the alternative for PermGen Pool in Java 8. How & where java 8(JVM) is storing per-class structure & internal string.

Does it also mean that we will not get the "java.lang.OutOfMemoryError: Java heap space" error

Upvoting because I had no idea Java 8 was released yet. – Christopher Wirt May 07 '14 at 07:08 — Christopher Wirt, May 07 '14 at 07:08
http://www.infoq.com/news/2013/03/java-8-permgen-metaspace – Masudul May 07 '14 at 07:08 — Masudul, May 07 '14 at 07:08
http://java.dzone.com/articles/java-8-permgen-metaspace – a_horse_with_no_name May 07 '14 at 07:08 — a_horse_with_no_name, May 07 '14 at 07:08

Aniket Thakur · Answer 1 · 2014-05-07T08:38:35.240

It will use Metaspace which is PermGen successor. More info here.

To answer your question

A new flag is available (MaxMetaspaceSize), allowing you to limit the amount of native memory used for class metadata. If you don’t specify this flag, the Metaspace will dynamically re-size depending of the application demand at runtime.

So yes due to dynamic re-sizing the java.lang.OutOfMemoryError: Java heap space will not occur till native memory is exhausted but still you need to take care of class and classloader memory leaks.

Java 8 - Permanent Generation Support - Alernative

1 Answers1