Details
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Bug
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Status: Closed
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Minor
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Resolution: Fixed
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2.2.3.1
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Tomcat 7 application server, Jasperreports 4.1.1
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Patch
Description
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
if (MakeIterator.isIterable(value)) { return new ValueStackDataSource(this.valueStack, expression); } else { return value; }
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