Will the Guru

• All the static variables and general metadata lives in Metaspace area.
• All the objects on the Heap that are referenced by the static variables in Metaspace will never be garbage collected.
  • Because the static variable is never gone.
• Before Java 7, it was called as the PermGen.
  • Sometimes when the PermGen got full, it returned java.lang.OutOfMemoryError: PermGen, which was able to be resolved by setting -XX:PermSize=N and -XX:MaxPermSize=N.
  • However after Java 8, these flags are no longer valid as PermGen is replaced by Metaspace.

Reference

• https://www.udemy.com/course/java-application-performance-and-memory-management/