java - Access nested list elements in jasper reports -


i have specific task , aim create pdf report java.util.collection list elements. size of list not predefined nested list size, java.util.collection list, not predefined. each report have print in new page. in end need have 1 pdf file on meany lists.

the problem cannot access nested list elements

i made subreport nested list elements, 

<subreport isusingcache="false" runtobottom="true">     <reportelement uuid="23bd89bf-ac96-4a86-8d78-55e07d8bd280" positiontype="float" stretchtype="relativetotallestobject" mode="transparent" x="0" y="64" width="555" height="651"/> <datasourceexpression><![cdata[new net.sf.jasperreports.engine.data.jrbeancollectiondatasource($f{records})]]></datasourceexpression> <subreportexpression><![cdata[$p{paymentdetailssubreport}]]></subreportexpression> </subreport>

$f{records} data field must data array nested list. cannot figure out way how access nested list elements. found article field mapping http://community.jaspersoft.com/questions/527663/context-help-access-getters doesn't work in case

any idea how access nested list elements?


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