jasperreports plugin's ValueStackDataSource converts field values in
ValueStackDataSource even when it's not wanted
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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
Priority: Minor
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
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