Resetting the reader throws a NullPointerException

[cdokolas]

If a client calls the reader's reset() method, the following exception is thrown

NullPointerException: Cannot invoke "javax.imageio.stream.ImageInputStream.getStreamPosition()" because "this.iis" is null

It is apparent that J2KImageReader.setInput() ignores the possibility that the input parameter may be null, as it will be when called by ImageReader.reset() (the base class).