XML Parsing Error: Invalid unicode character with NEKO

[mhn]

My page hangs if a user submits a query via ajax with unicode characters (e.g. Alt + 01).

The ajax console shows during rendring:

error[14:57:16,523]: Error parsing XML

error[14:57:16,523]: Parse Error: XML Parsing Error: Invalid unicode character.

Environment:

- richfaces 3.3.3

- myfaces 1.2.9

- facelets

- neko parser 1.9.12

- main template contains:

-- <?xml version="1.0" encoding="UTF-8"?>

-- <meta charset="UTF-8"/>

- request and response character encoding  is also UTF-8

The unicode char is correctly processed and displayed in NON-Ajax requests.

The unicode char is correctly processed but not displayed in the response if tidy filter is used for ajax requests.

What can I do to avoid this parsing error in combination with NEKO?

[mhn]

After a lot of debugging I found an inconsistency.

In my sample user enters the Unicode Character 'START OF HEADING' (in windows Alt + 01 or U+0001).

http://www.fileformat.info/info/unicode/char/1/index.htm

This character is rendered as \u0001 in outputText tags which is fine.

It causes the above mentioned parsing error if it is rendered as an attribute value, e.g. as value of an inputText field.

This is caused by a wrong transformation in class org.ajax4jsf.xml.serializer.ToXHTMLStream.

Method ToXHTMLStream.writeAttrString contains following check:

String outputStringForChar = m_charInfo.getOutputStringForChar(ch);

if (null != outputStringForChar)

{

    writer.write(outputStringForChar);

}

else if (escapingNotNeeded(ch))

{

    writer.write(ch); // no escaping in this case

}

else

{

    writer.write("&#");

    writer.write(Integer.toString(ch)); //THIS IS CALLED!

    writer.write(';');

}

The 'START OF HEADING' control char is transformed to the entity &#1; which results in an parsing error on client side.

[mhn]

Is there any workaorund or should I create a JIRA issue ?