AndroidJNI reports lots of exceptions that don't propagate to Unity

I'm working on a plugin for Android, and I set AndroidJNI.debug = true. My code is working, and I'm getting the correct output from Java in the C#-side, the JNI itself logs a lot of exceptions. For example:

 11-11 19:12:38.084: D/Unity(10003):  AndroidJNI_CUSTOM_FindClass()
 11-11 19:12:38.092: D/Unity(10003):  AndroidJNI_CUSTOM_ExceptionOccurred()
 11-11 19:12:38.092: D/Unity(10003):  AndroidJNI_CUSTOM_NewGlobalRef()
 11-11 19:12:38.131: D/Unity(10003):  AndroidJNI_CUSTOM_FindClass()
 11-11 19:12:38.131: D/Unity(10003):  AndroidJNI_CUSTOM_ExceptionOccurred()
 11-11 19:12:38.131: D/Unity(10003):  AndroidJNI_CUSTOM_NewGlobalRef()

These exceptions don't propagate to Unity, and my code is working, but these logs don't look healthy, if only from a performance perspective.

Any insight greatly appreciated!