QName::=(NCName':')?NCName error when tml is parsed

[Jens Breitenstein]

Hi T5 Users!

I am struggling with an strange error in T5.3.7 and hopefully one of you 
can give me a hint how to track it down..

I wrote a "Icon" component to show bootstrap glyphicons:

public class Icon
{
    @Parameter(required = true, defaultPrefix = BindingConstants.LITERAL)
    @Property private String _name;

    boolean beginRender(final MarkupWriter writer)
    {
        // <span class="glyphicon glyphicon-log-in"/>
        writer.element("span", "class", "glyphicon glyphicon-" + _name);
        writer.end();
        return true;
    }
}


So it's possible to show a glyphicon in a page by

<t:Icon name="exclamation-sign"/>

Everthing worked fine until I moved to component to a "common library 
package". After starting Jetty and accessing a page which uses this 
component I get:

Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: 
Failure parsing template 
classpath:de/xyz/application/client/pages/DataManaging.tml: Element or 
attribute do not match QName production: QName::=(NCName':')?NCName.  
[at classpath:de/xyz/application/pages/DataManaging.tml, line 9]
    at 
org.apache.tapestry5.internal.services.SaxTemplateParser.parse(SaxTemplateParser.java:173)
    at 
org.apache.tapestry5.internal.services.TemplateParserImpl$1.invoke(TemplateParserImpl.java:61)
    at 
org.apache.tapestry5.internal.services.TemplateParserImpl$1.invoke(TemplateParserImpl.java:58)
    at 
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
    ... 98 more
Caused by: org.xml.sax.SAXParseException: Element or attribute do not 
match QName production: QName::=(NCName':')?NCName.
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at 
org.apache.tapestry5.internal.services.XMLTokenStream.parse(XMLTokenStream.java:317)
    at 
org.apache.tapestry5.internal.services.SaxTemplateParser.parse(SaxTemplateParser.java:163)


Even more confusing is the fact the error never appears again it only 
occurs on first access.


Thanks in advance


Jens