Until Java 7, there was an area in JVM memory called
PermGen, where JVM used to keep its classes. In Java 8, Permanent Generation (PermGen) space was completely removed and is replaced by a new space called Metaspace.
The consequences of the PermGen removal is that
obviously the PermSize and MaxPermSize JVM arguments are ignored and you will
never get a java.lang.OutOfMemoryError: PermGen error.
Metaspace by default auto increases its size (up to
what the underlying OS provides), while PermGen always has a fixed maximum
size. You can set a fixed maximum for Metaspace with JVM parameters, but you
cannot make PermGen auto increase.
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