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https://issues.apache.org/struts/browse/WW-3188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=46484#action_46484
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Dave Newton commented on WW-3188:
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Hmm, not really--whenever I've worked w/ load-balanced systems the sessions
were shared, so things like the message store interceptor work.
> Don't render action errors/messages when have null message
> ----------------------------------------------------------
>
> Key: WW-3188
> URL: https://issues.apache.org/struts/browse/WW-3188
> Project: Struts 2
> Issue Type: Improvement
> Affects Versions: 2.1.6
> Environment: Freemarker
> Reporter: Jasper Rosenberg
> Priority: Minor
> Fix For: 2.1.8
>
>
> Often I will end up passing an actionMessage to be rendered via an url such
> as:
> http://www.myco.com/myapp/doit.action?actionMessages=Display+This+Message
> This message is often set dynamically in the result for a redirect, for
> example:
> <result
> type="redirect">http://www.myco.com/myapp/doit.action?actionMessages=${actionMessages[0]}</result>
> But of course there may be no actionMessage actually available, and so the
> url ends up:
> http://www.myco.com/myapp/doit.action?actionMessages=
> In this case we end up with one null action message in the actionMessages
> list, and so when you use the actionmessage tag, you get a list with "null"
> as the message.
> I worked around this by just overriding the actionmessage.ftl and
> actionerror.ftl templates to check that if the list has content, the first
> element also "?has_content". This isn't terribly general though.
> I think a decent improvement would be to just check each action message with
> ?has_content (which checks for null and empty string) as you iterate and only
> render the "li" if it is true. Then just only output the starting "ul" when
> hit the first one, and the terminating ul if there was a message with content
> found.
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