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https://issues.apache.org/jira/browse/WW-3698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14032276#comment-14032276
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olivier rousseil commented on WW-3698:
--------------------------------------
Since the revert made in 2.3.16 we have again the original bug !
It's impossible to export a report A if it has a subreport B.
For example, the error is :
Caused by: java.lang.ClassCastException:
org.apache.struts2.views.jasperreports.ValueStackDataSource cannot be cast to
java.util.List
when jasper try to evaluate expression :
net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating
expression :
Source text : new
net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{listForBSubReport})
> jasperreports plugin's ValueStackDataSource converts field values in
> ValueStackDataSource even when it's not wanted
> -------------------------------------------------------------------------------------------------------------------
>
> Key: WW-3698
> URL: https://issues.apache.org/jira/browse/WW-3698
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - JasperReports
> Affects Versions: 2.2.3.1
> Environment: Tomcat 7 application server, Jasperreports 4.1.1
> Reporter: Dario Tortola
> Assignee: Lukasz Lenart
> Priority: Minor
> Labels: patch
> Fix For: 2.3.12
>
> Original Estimate: 20m
> Remaining Estimate: 20m
>
> Report A with Subreport B
> Subreport B's datasource is a java.util.List field of Report A's datasource's
> elements
> org.apache.struts2.views.jasperreports.ValueStackDataSource.getFieldValue,
> after locating the value, if
> org.apache.struts2.util.MakeIterator.isIterable(value) instead of value a new
> ValueStackDataSource over value is returned.
> Since ValueStackDataSource is not a java.util.List, a
> javax.servlet.ServletException is thrown when the returned
> ValueStackDataSource fails to be cast to List
> To avoid such unwanted conversion it's enough to change this code on
> ValueStackDataSource.getFieldValue
> {code:java}
> if (MakeIterator.isIterable(value)) {
> return new ValueStackDataSource(this.valueStack, expression);
> } else {
> return value;
> }
> {code}
> replace (MakeIterator.isIterable(value)) with
> (!field.getValueClass().isInstance(value) && MakeIterator.isIterable(value))
> for the new ValueStackDataSource to be returned only if the value is not
> already what the field asks for
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