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https://issues.apache.org/jira/browse/VELOCITY-423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henning Schmiedehausen closed VELOCITY-423.
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> Report invalid references
> -------------------------
>
> Key: VELOCITY-423
> URL: https://issues.apache.org/jira/browse/VELOCITY-423
> Project: Velocity
> Issue Type: New Feature
> Components: Engine
> Reporter: Will Glass-Husain
> Assigned To: Will Glass-Husain
> Fix For: 1.5
>
> Attachments: invalidreference.txt
>
>
> I've made a new patch that includes a ReferenceInsertionEventHandler
> ("InvalidReferenceHandler") that collects a list of all invalid references in
> a Velocity page.
> To see how it works, look at the test code (the last two methods) in
> BuiltInEventHandlerTestCase.
> To make this work, I had to make some changes to the internals. So I thought
> I'd hold off a couple days before committing, let any interested parties
> comment.
> There's a couple of interesting new pieces for plugin writers.
> (1) In any user-defined plugin (event handlers, uberspectors, etc) you can
> now throw a subclass of VelocityRuntimeException (new exception). to signal
> unrecoverable states to the calling application. This runtime exception
> requires no change to the interface signature and is passed through the
> Velocity parsing process. (In the past, all Exceptions were caught and
> logged).
> Example use: a custom uberspector or event handler that wishes to stop page
> processing. For example, the InvalidReferenceHandler can be configured to
> throw an exception at the first reference error.
> (2) Event handlers can now receive information on the template name, line
> number, and column by implementing InfoAware. This only works for Local
> event handlers attached to a context (as opposed to the new Global type
> defined in Velocity properties).
> Example use: InvalidReferenceHandler reports out the line,column, and
> template name of each reference error.
> Everything is completely backwards compatible. It'd be simpler if it wasn't
> of course as they we could just redo the interfaces.
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