Java JNI NewGlobalRef

https://stackoverflow.com/questions/2093112/why-i-should-not-reuse-a-jclass-and-or-jmethodid-in-jni?rq=3

https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/design.html#accessing_fields_and_methods

https://stackoverflow.com/questions/10617735/in-jni-how-do-i-cache-the-class-methodid-and-fieldids-per-ibms-performance-r/13940735#13940735

http://normanmaurer.me/blog/2014/01/07/JNI-Performance-Welcome-to-the-dark-side/

https://stackoverflow.com/questions/32685927/android-jni-and-newglobalref

https://www.ibm.com/docs/en/sdk-java-technology/8?topic=collector-overview-jni-object-references