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https://issues.apache.org/jira/browse/WICKET-6533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16357181#comment-16357181
 ] 

Maxim Solodovnik commented on WICKET-6533:
------------------------------------------

I can confirm, reproducible using following simplified code:

{code}
        @Override
        protected void onInitialize() {
                super.onInitialize();
                Form<Void> form = new Form<>("form");

                final TextField<String> field = new TextField<>("field", 
Model.of(""));
                form.add(field.setOutputMarkupId(true));
                add(form.add(new AjaxButton("submitButton", form) {
                        private static final long serialVersionUID = 1L;

                        @Override
                        protected void onSubmit(final AjaxRequestTarget target) 
{
                                field.setModelObject("\ufffe");
                                target.add(field);
                        }
                }));
        }
{code}

> 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
>
>
> 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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