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https://issues.apache.org/struts/browse/WW-3306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=47018#action_47018
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Andreas Krüger commented on WW-3306:
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> By default(no need to set struts.el.throwExceptionOnFailure), struts will be
> silent about errors in expressions,
No problems as far as that is concerned. It's not what we want or need, but it
functions as described.
> To make struts throw errors in expressions, and missing properties set
> struts.el.throwExceptionOnFailure=true.
This we do.
And this does not work as described:
It also throws exceptions not only on missing properties, but also on
properties which exist, but return a null value.
This bug seems to exist only when the property is a property of the model.
All is well when the property is from an action object.
The code as given above can be used to reproduce the bug. If you have any
problem reproducing the bug, I'd be glad to help.
> Null value accepted from action property, but not model property when
> throwExceptionOnFailure=true
> --------------------------------------------------------------------------------------------------
>
> Key: WW-3306
> URL: https://issues.apache.org/struts/browse/WW-3306
> Project: Struts 2
> Issue Type: Bug
> Components: Value Stack
> Affects Versions: 2.2.0
> Reporter: Andreas Krüger
>
> In this project, we experiment with setting
> struts.el.throwExceptionOnFailure=true to catch errors.
> We use <s:property value="myprop" /> in our JSP.
> Occasionally, the property thus referenced is null. We want struts to insert
> an empty string in that case.
> This it duely does, when either struts.el.throwExceptionOnFailure=false or
> when the property is from an action object.
> However, if the property is from a model object and
> struts.el.throwExceptionOnFailure=true, this bombs out.
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