Java – why doesn’t the Oracle specification tell you anything about meta spaces?

As we all know, Java 1.8 permgen was deleted and replaced by Metaspace

I've read a lot about Metaspace, and I'm sure it exists. But today I was asked about the reference of Oracle JVM specification, including the statement about Metaspace, but by searching all specifications, I couldn't find any matching word "Metaspace"

Can someone share a link to this information with me or tell me why I didn't find any information about it?

Solution

This is the implementation details of hotspot, not what should or should exist in the general JVM specification

You can see that it is described in JEP 122: remove the permanent generation, and some problems are linked from jdk-8046112 and jdk-6964458