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https://issues.apache.org/jira/browse/WICKET-6533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358062#comment-16358062
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Maxim Solodovnik edited comment on WICKET-6533 at 2/9/18 8:43 AM:
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I guess this Unicode char need to be escaped here
 
[https://github.com/apache/wicket/blob/master/wicket-util/src/main/java/org/apache/wicket/util/string/Strings.java#L376]
 But is not escaped ....

Would in be OK to enlarge current {{non-printable and not whitespace}} list?
 According to this: 
[https://www.fileformat.info/info/unicode/char/fffe/index.htm] this is 
{{Unicode Noncharacter}}, seems to also be non-printable ....

Addition:
{code:java}
final String val = "\ufffe";
String aa = org.apache.commons.text.StringEscapeUtils.escapeXml11(val);
String a1 = org.apache.commons.text.StringEscapeUtils.escapeXml10(val);
{code}
Both {{aa}} and {{a1}} are {{empty string}}

WDYT?


was (Author: solomax):
I guess this Unicode char need to be escaped here
https://github.com/apache/wicket/blob/master/wicket-util/src/main/java/org/apache/wicket/util/string/Strings.java#L376
But is not escaped ....

Would in be OK to enlarge current {{non-printable and not whitespace}} list?
According to this: https://www.fileformat.info/info/unicode/char/fffe/index.htm 
this is {{Unicode Noncharacter}}, seems to also be non-printable ....

Addition:
{code}
final String val = "\ufffe";
String aa = org.apache.commons.text.StringEscapeUtils.escapeXml11(val);
String a1 = org.apache.commons.text.StringEscapeUtils.escapeXml10(val);
{code}
Both {aa}} and {{a1}} are {{empty string}}

WDYT?

> Error while parsing xml using AjaxButton
> ----------------------------------------
>
>                 Key: WICKET-6533
>                 URL: https://issues.apache.org/jira/browse/WICKET-6533
>             Project: Wicket
>          Issue Type: Bug
>    Affects Versions: 8.0.0-M8
>            Reporter: Łukasz Ludwa
>            Priority: Major
>         Attachments: showcase.zip, showcase_simplified.zip
>
>
> Problem is caused when refreshing markup using Ajax and in data is special 
> character (�).
> Error occurs in my project everywhere when refreshing markup using Ajax where 
> this special character occurs.
> I create and attach quickstart project which reproduces this problem in 
> simple way: changing markup through hiding/showing TextField by ajax button.
>  
> Steps to reproduce problem:
> 1. Download and run attached quickstart project
> 2. Enter to TextField symbol presented under "Insert this string for 
> error..." label:
> 3) Click „Regular submit” twice (this causes component to refresh, but 
> doesn’t cause error)
> 4) Now click „Ajax submit” twice – this causes button to not refresh markup 
> and show error:
>  
> {code:java}
> ERROR: Wicket.Ajax.Call.failure: Error while parsing response: Error: Invalid 
> XML: <?xml version="1.0" encoding="UTF-8"?><ajax-response><component 
> id="field3" ><![CDATA[<input value="" name="field" 
> id="field3"/>]]></component></ajax-response>{code}



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