Hi I have been wondering How iReport takes care of subreport I faced all above problem doing subreport in iReport. In order to pass List / collection to subreport following things need to be done.... In Main Report. >>>>>>>>>>>>>>>>> Put Following <import value="net.sf.jasperreports.engine.*"/> <import value="net.sf.jasperreports.engine.data.*"/> //Define List <field name="addresses" class="java.util.List"/> Pass List to subreport <subreport isUsingCache="true"> <reportElement x="0" y="39" width="555" height="276"/> <dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{addresses})]]></dataSourceExpression> <subreportExpression class="java.lang.String"><![CDATA[$P{SUBREPORT_DIR} + "report1_subreport5.jasper"]]></subreportExpression> </subreport> In Subreport >>>>>>>>>>>>>>>>> put Following very important >>> below address is field in my addressess List in Main Report <field name="address" class="java.lang.String"/> and In Detail Section Put Following <textField isStretchWithOverflow="true" isBlankWhenNull="true"> <reportElement x="142" y="20" width="92" height="20"/> <textElement> <font size="12"/> </textElement> <textFieldExpression class="java.lang.String"><![CDATA[$F{address}]]></textFieldExpression> </textField> Remeber Many time you might not see subreport visible in main report reson being it the Property for Data to visible >> "When No Data "(Property of report) should be set accordingly. Hope this might help some one.... Ranjit
