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Posted to dev@tapestry.apache.org by "Jesse Kuhnert (JIRA)" <ta...@jakarta.apache.org> on 2006/12/08 22:01:27 UTC
[jira] Resolved: (TAPESTRY-1177) ForBean can cause
NullPointerException when rendered without a template
[ http://issues.apache.org/jira/browse/TAPESTRY-1177?page=all ]
Jesse Kuhnert resolved TAPESTRY-1177.
-------------------------------------
Resolution: Fixed
Resolved issue by changing line of logic that sets the local "render" boolean to just check if element is null. Thanks for the patch!
> 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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