[ http://issues.apache.org/jira/browse/TAPESTRY-1177?page=all ]
Jesse Kuhnert updated TAPESTRY-1177:
------------------------------------
Fix Version/s: 4.1.1
Assignee: Jesse Kuhnert
> ForBean can cause NullPointerException when rendered without a template
> -----------------------------------------------------------------------
>
> Key: TAPESTRY-1177
> URL: http://issues.apache.org/jira/browse/TAPESTRY-1177
> Project: Tapestry
> Issue Type: Bug
> Components: Framework
> Affects Versions: 4.1.1
> Reporter: Phil McCarthy
> Assigned To: Jesse Kuhnert
> Priority: Minor
> Fix For: 4.1.1
>
> Attachments: ForBean.java.tapestry-1177.patch
>
>
> Create a component which doesn't implement ITemplateComponent. In the
> component specification, declare a For component, but don't bind its optional
> "element" parameter. Call the For component's render() method.
> Stacktrace is:
> java.lang.NullPointerException
> Stack Trace:
> *
> org.apache.tapestry.markup.MarkupWriterImpl.end(MarkupWriterImpl.java:261)
> *
> org.apache.tapestry.components.ForBean.renderComponent(ForBean.java:183)
> * ...
> The problem is caused by line 140 of ForBean.java:
> String element = HiveMind.isNonBlank(getElement()) ? getElement() :
> getTemplateTagName();
> Because no element binding was specified, and there's no template, this
> returns null. The markup writer pushes the null value when begin(null) is
> called, then barfs when it is popped in end().
> Fix is to not call loopWriter.begin()/end() when element is null.
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