# File lib/gettext/core_ext/iconv.rb, line 40
      def self.conv(to, from, str)
        raise InvalidCharacter, "the 3rd argument is nil" unless str
        begin
          str = java.lang.String.new(str.unpack("C*").to_java(:byte), from)
          str.getBytes(to).to_ary.pack("C*")
        rescue java.io.UnsupportedEncodingException
          raise InvalidEncoding
        end
      end