java - When does GetByteArrayElements return null?

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I'm using JNI/NDK to tie in some C++ libraries with an Android app. One of the Java methods uses a byte array, so I need to call GetByteArrayElements in the JNI bindings. In what cases does GetByteArrayElements return NULL? Oracle's documentation simply states:

Returns a pointer to the array elements, or NULL if the operation fails.

What cases can cause the operation to fail and return NULL?

@downvoter You're disagreeing with the JNI Specification here. If you can find wording in there that contradicts this answer please provide it. – user207421 Sep 30, 2014 at 0:12 Rephrased the question slightly, because, "Are there cases where it can return null?" was looking for what those cases are, not just a simple, "Yep." Thought that would be obvious to any reader, but I guess not. – derpface Oct 1, 2014 at 13:05

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