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• This keeps the number of JNI global refs HotSpot has to manage to a minimum
  • Java objects are should not be pinned in the Java heap until some random native retain count lowers or the ObjC-GC runsdecides to kick in
• Java objects that own native objects have to concretely define the lifecycle of the native objects they hold
• The jlong type is used because it is big enough to hold both 32 and 64-bit sized pointers
  • Use the jlong_to_ptr() and ptr_to_jlong() macros to correctly handle casting and avoid sign-extension problems

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