I've tested this against LWJGL 2.0, 2.1, 2.2.2, 2.4.1, 2.6, 2.7.1:
Whenever I make calls to alGetSourcei it returns the property # instead of the value. This is the case for AL_BUFFERS_PROCESSED and AL_SOURCE_STATE at the very least.
I'm trying to record audio from the microphone and play it back as a stream.