What is the difference between `PermGen` (Java 7) and `Metaspace` (Java 8+)?

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What is the difference between `PermGen` (Java 7) and `Metaspace` (Java 8+)?

Key points

  • PermGen had fixed size; Metaspace grows dynamically
  • PermGen prone to OutOfMemoryError; Metaspace avoids this issue
  • Metaspace stores class metadata in native memory

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