How does the Metaspace area differ from PermGen in JVM, and what was introduced instead of PermGen in newer Java versions?

In the JVM, the PermGen (Permanent Generation) space was used to store class metadata, such as information about classes, methods, and constants. However, PermGen had a fixed size, which could lead to OutOfMemoryError errors when loading a large number of classes.

In newer versions of Java (starting from Java 8), PermGen was replaced by Metaspace. Key differences:

• Metaspace is allocated in native memory (heap is not limited by JVM), allowing dynamic expansion of the metadata area.
• Memory management of Metaspace is more flexible, reducing the likelihood of errors due to memory shortages.

Thus, Metaspace is a modern memory area for storing class metadata, replacing PermGen.