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https://issues.apache.org/struts/browse/WW-3306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=47016#action_47016
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Musachy Barroso 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, if this is not the case, please provide
more details and we will see if it is a bug. To make struts throw errors in
expressions, and missing properties set struts.el.throwExceptionOnFailure=true.
If the error is not consistent, provide details to reproduce.
> 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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