I've had this problem before as well, in my case it was related to a Label
component trying to render a label for a RadioGroup. Inside beginRender of
the Label component, it does this:
labelElement.forceAttributes("for", fieldId, "id", fieldId + ":label");
In my case, fieldId was null (as RadioGroup implements ClientElement but its
getClientId() method returns null). In 5.1.0.1, a change meant that an
attribute with a null value was saved in the Element, so when the
Attribute.render() method was called, a null was passed as the value to
encodeQuoted() on the markup model.
In my case, the solution was to not use the Label component for the
RadioGroup, but just have a normal <label> tag in my template.
Ciaran
On 23/03/2009 6:37pm, "Ville Virtanen" <ville.virta...@cerion.fi> wrote:
>
> Ok, now I had time to look it little closer:
>
> In the particular view I'm generating lazy initialization exp and observe
> T5:
>
> The String content is null and thus of course generates npe at that point.
> the last encoded string (or one of those) is t-omitted-frame, so it actually
> crashes somewhere when rendering the own T5 error page?
>
> Anyway, I don't have the required insight to trace the T5 rendering
> mechanisms quickly, and unfortunately just now I don't even have the time to
> make a view that reproduces it. (This does not happen under all
> circumstances.)
>
> I'll be back when I have time (if it is not solved yet) but atm my work is
> too crazy...
>
> - Ville
>
> Code that crashes: (AbstractMarkupModel, 94)
> public void encodeQuoted(String content, StringBuilder builder)
> {
> int length = content.length(); <-------
>
>
>
> Ville Virtanen wrote:
>>
>> Hi,
>>
>> We are constantly getting this stacktrace on some of our views. Nothing,
>> and I mean nothing else is visible. The normal T5 error page doesn't come
>> up etc. Only this stacktrace. Using 5.1.0.1-20090305.090208-13 everything
>> works ok.
>>
>> Does anyone know how to trace this or dig deeper?
>>
>> - Ville
>>
>> java.lang.NullPointerException
>> at
>> org.apache.tapestry5.dom.AbstractMarkupModel.encodeQuoted(AbstractMarkupModel
>> .java:94)
>> at
>> org.apache.tapestry5.dom.Element$Attribute.render(Element.java:60)
>>
>>
>>
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