Spring specify null and zero length data

String: length of zero and null value are not same. but, this code return null when string has length of zero.

So, I think it need to be more specific. if the parameter String(source) value is null -> then NullPointException is occured (automatically). and if String length is not valid (that is length is not 1) -> then IllegalArgumentException ocurred by the code.

Please check and leave a comment. thank you.

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