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https://issues.apache.org/struts/browse/WW-2330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45490#action_45490
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Ralf Fischer commented on WW-2330:
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Isn't this "[L" the prefix which the toString() method of an array prepends?
If parameters.file is a String array, this expression should work:
<s:set name="a" value="%{'/jsp/'+#parameters.file[0]}" />
> unable to concatenate strings in the value attribute of the set tag
> -------------------------------------------------------------------
>
> Key: WW-2330
> URL: https://issues.apache.org/struts/browse/WW-2330
> Project: Struts 2
> Issue Type: Bug
> Components: Expression Language
> Affects Versions: 2.0.11
> Environment: Tested on Debian Linux testing with Tomcat 6.0.14 and
> JBoss 4.
> Reporter: Anton Pussep
> Fix For: Future
>
>
> There seems to be no intuitive way to concatenate strings in the value
> attribute of the set tag:
> <s:set name="a" value="%{'/jsp/'+#parameters.file}" />
> sets "a" to "/jsp/[Ljava.lang.String;@1bd2184", it also didn't help to
> enforce evaluation as a string:
> <s:set name="a" value="%{'/jsp/'+#parameters.file.toString()}" />
> Also in the Struts mailinglist no one could tell me, how to do that, even
> though I got an excellent reply:
> http://www.nabble.com/forum/ViewPost.jtp?post=13825946&framed=y
> I think there should be an intuitive way to do that, for instance it works in
> the text tag:
> <s:text name="/jsp/%{#parameters.file}" />
> The same one of the following would be logical for the set tag:
> <s:set name="a" value="%{'/jsp/' + #parameters.file}" />
> <s:set name="a" value="%{'/jsp/'#parameters.file}" />
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