In current "master" branch, jme3-bullet-native builds a "libbulletjme.so" native library for Platform.Linux_ARM64.

However, NativeLibraryLoader is unable to load the native library, because JmeSystemDelegate.getPlatform() identifies aarch64 architectures as Platform.Linux64 instead of Platform.Linux_ARM64.

Here's the culprit:

I'll fix it in "master". The fix should be backported to "v3.3" branch.