An odd "XML parsing failed" still after using jstl c:out

The jstl c:out tag can escape xml characters. However, I still got the "XML parsing failed" as followed:

XML parsing failed
XML parsing failed: syntax error (Line: 34, Charac开发者_StackOverflowter: 3)

Error:
invalid character

Specification:
http://www.w3.org/TR/REC-xml/#NT-Char

31:
32: <a href="someUrl">userA</a>
33: Says:
34: \11\08\10\10\10\11
35: (13:47)
36:
37:<br/>

Now I'm confused by the output.

\11 (=U+000B) is not a valid character in an XML 1.0 document.

This is probably the result of a broken encoding. Make sure you're using UTF-8, and investigate where that strange character comes from.