Permanent Generation (PermGen) space removed in Java 8

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Former user (Deleted)
Last updated: Jan 25, 2023 by
Stonebranch

Problem

The Permanent Generation (PermGen) space has been completely removed in Java 8.

If you specify the Maximum PermGen Size option (-XX:MaxPermSize=<NNN>) for a Java 8 VM, you may see a warning message similar to the following.
 

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=512m; support was removed in 8.0

Resolution

The PermGen space is superseded by a new space called Metaspace in Java 8.

You can specify the Maximum Metaspace Size with the analogous -XX:MaxMetaspaceSize=<NNN> option; however, the default (no limit) is recommended for most deployments.