In the AES cipher implementation, the override of engineDoFinal() method in the following code is not necessary as it only calls super.

    /**
     * Finalize crypto operation with ByteBuffers
     *
     * @param input the input ByteBuffer
     * @param output the output ByteBuffer
     *
     * @return output length
     * @throws ShortBufferException
     * @throws IllegalBlockSizeException
     * @throws BadPaddingException
     */
    protected int engineDoFinal(ByteBuffer input, ByteBuffer output)
        throws ShortBufferException, IllegalBlockSizeException,
        BadPaddingException {
        return super.engineDoFinal(input, output);
    }