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https://issues.apache.org/struts/browse/WW-2333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44586#action_44586
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Dave Newton commented on WW-2333:
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I'm not sure what you said there.
All I know is that there have been reports of non-S2 reports failing because of
the conversion/wrapping/whatever of action properties that are collections.
(And my first S2-only report w/ subreports failed because I didn't know the S2
result type "helped" me by creating it.)
> ValueStackDataSource implementation leads to class cast exceptions
> ------------------------------------------------------------------
>
> Key: WW-2333
> URL: https://issues.apache.org/struts/browse/WW-2333
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - JasperReports
> Affects Versions: 2.0.11
> Reporter: Thorsten Schäfer
> Fix For: Future
>
>
> Assume you have a class Foo that has a Collection of Bar's. Without using
> Struts, the expected behavior of a report that takes Foo's as input is, that
> a reference $F{bar} returns a java.util.Collection (of Bar's). However, this
> will not be the case when using the ValueStackDataSource implementation; an
> instance of ValueStackDataSource is returned instead of a collection. If the
> method "getFieldValue" gets called, it checks if the field value is
> iteratable (which is true for collections) and then returns a new
> ValueStackDataSource instead of the field value itself. I assume that this
> behavior breaks many reports.
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