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https://issues.apache.org/struts/browse/WW-3306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=46994#action_46994
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Musachy Barroso commented on WW-3306:
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O_o. By default all EL errors are swallowed, you don't need to set that flag at
all. If a property is null, or there is an exception evaluating an expression
nothing happens and nothing get written to the output. Many users have asked a
way to make struts throw an exception when an EL expression uses an invalid
property or when an exception is throw, and that's what
struts.el.throwExceptionOnFailure=true does.
Thanks for the best practices tutorial/tutorial, but I have a strong feeling
that having created this setting myself, I might know what I am talking about.
> 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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