Fix BufferUnderflowException

[bautismal]

Fix bug for issue #2523

[jfarcand]

@bautismal This is a great start. I would check if the bb.array() is large enough (using the limit), and fall back to your solution if not. What do you think?

[bautismal]

@jfarcand, Not sure what change you are suggesting?
I think the following code is a nonsense - copying the array to itself ?
Either directly return bb.array(), or create a new byte array and copy the contents of bb to it, or am I missing something?

byte[] b = bb.array();
bb.get(b);