Please support Surrogate Pair String data receive.

Question

Dear Sir,
I would like to report a problem that when data which contains surrogate pair string is posted, BlazeDS servlet does not response.
One of good example { 0xf0, 0xa9, 0xb8, 0xbd } utf-8 bytes.
The charactor of the bytes is a japanese charactor 'hokke'.
What's going on is that when a surrogate pair string is posted, flex.messaging.io.amf.Amf3Input::readUTF() method could not handle the utf-8 bytes to String conversion, then UTFDataFormatException, which is an IOException,  is thrown.
The exception is handled at flex.messaging.endpoints::service() method as "This happens when client closes the connection, log it at info level".
I would like you to improve flex.messaging.io.amf.Amf3Input::readUTF() method to be ABLE to handle surrogate pair string.
One of quick fix for my test purpose is the following...
     * @exclude
    protected String readUTF(int utflen) throws IOException
        char[] charr = getTempCharArray(utflen);
        byte[] bytearr = getTempByteArray(utflen);
        int c, char2, char3;
        int count = 0;
        int chCount = 0;
        in.readFully(bytearr, 0, utflen);
         * Use String class constructor for utf-8 deserialization for surrogate pair support.
        String s = new String(bytearr, 0, utflen, "utf-8");
        return s;
I, Japanese user, and Asian users has confront the surrogate pair issue for IT solutions.
Please, consider to officially support this issue.
I would like to have some comment on this.
Best Regards.

Answer 1

We need to understand what you mean by "store surrogate pair". What do you want to do? Say you want to store the Unicode supplementary character represented by U+10300. This "internally" involves two surrogate code points, in pair (in the reserved U+D800 - U+DFFF range).
Surrogate Pair. A representation for a single abstract character that consists of a sequence of two 16-bit code units, where the first value of the pair is a high-surrogate code unit, and the second is a low-surrogate code unit. (See definition D75 in Section 3.8, Surrogates.)
Surrogate Code Point. A Unicode code point in the range U+D800..U+DFFF. Reserved for use by UTF-16, where a pair of surrogate code units (a high surrogate followed by a low surrogate) “stand in” for a supplementary code point.
From the Unicode glossary at:
http://unicode.org/glossary/
Note that it says "reserved for use by UTF-16".