Jaspersoft® Studio - Element list into element list

danbecvel · July 20, 2016

Hi,

I have an element list (students) into another element list (pages). For each 'page' it always must to show the same list of students. I got the list of students only for the first instance of 'page'.

My code:

<?xml version="1.0" encoding="UTF-8"?>

<![CDATA[]]>

</queryString>

</field>

</field>

</subDataset>

<![CDATA[]]>

</queryString>

</field>

</subDataset>

<![CDATA[]]>

</queryString>

</background>

<title>

</band>

</title>

</band>

</pageHeader>

</band>

</columnHeader>

</reportElement>

<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">

</datasetParameter>

</datasetParameter>

</datasetParameter>

</datasetParameter>

</datasetParameter>

</datasetParameter>

</datasetParameter>

</datasetParameter>

</datasetParameter>

</datasetRun>

<jr:listContents height="415" width="555">

<frame>

</reportElement>

</textElement>

</staticText>

<line>

</reportElement>

</line>

</reportElement>

</image>

</frame>

<frame>

</reportElement>

<box>

</box>

<frame>

</reportElement>

<box>

</box>

</reportElement>

</rectangle>

<line>

</reportElement>

</graphicElement>

</line>

</reportElement>

</textElement>

</staticText>

</reportElement>

</textElement>

</textField>

</frame>

<frame>

</reportElement>

<box>

</box>

</reportElement>

</rectangle>

<line>

</reportElement>

</graphicElement>

</line>

</reportElement>

</textElement>

</staticText>

</reportElement>

</textElement>

</textField>

</reportElement>

</textElement>

</textField>

</frame>

</reportElement>

</textElement>

</staticText>

<frame>

</reportElement>

<box>

</box>

</reportElement>

</rectangle>

</reportElement>

</textElement>

</textField>

</reportElement>

</textElement>

</textField>

</reportElement>

</textElement>

</textField>

</reportElement>

</textElement>

</textField>

</reportElement>

<box>

</box>

</textElement>

<text><![CDATA[Firmado:

(Formador/Resp. Formación)]]></text>

</staticText>

</frame>

<frame>

</reportElement>

<box>

</box>

<frame>

<box>

</box>

</reportElement>

<box>

</box>

</textElement>

</staticText>

</reportElement>

<box>

</box>

</textElement>

</staticText>

</reportElement>

<box>

</box>

</textElement>

</staticText>

</reportElement>

<box>

</box>

</textElement>

</staticText>

</reportElement>

<box>

</box>

</textElement>

</staticText>

</frame>

</reportElement>

<jr:list printOrder="Vertical">

</datasetRun>

<jr:listContents height="20" width="555">

<frame>

</reportElement>

<box>

</box>

</reportElement>

<box>

</box>

</textElement>

</textField>

</reportElement>

<box>

</box>

</textElement>

</textField>

</reportElement>

<box>

</box>

</textElement>

</textField>

</reportElement>

<box>

</box>

</textElement>

</textField>

<line>

</reportElement>

</graphicElement>

</line>

</frame>

</jr:listContents>

</jr:list>

</componentElement>

</frame>

<frame>

</reportElement>

<box>

</box>

</reportElement>

</textElement>

</staticText>

</frame>

</jr:listContents>

</jr:list>

</componentElement>

</band>

</detail>

</columnFooter>

</band>

</pageFooter>

</band>

</summary>

</jasperReport>

lucianc · July 20, 2016

You are using $P{REPORT_PARAMETERS_MAP}.get( "students" ) as data source for the list, which means that a single data source object is used several times. That will not work because the data source gets consumed the first time it is used.

You'll need to create a fresh data source instance each time (for instance by putting a list in the parameters map and using new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource((List) $P{REPORT_PARAMETERS_MAP}.get("studentsList")) as list data source, or if the data source implements JRRewindableDataSource find a way to call moveFirst() before reusing the data source.

Regards,

Lucian

danbecvel · July 20, 2016

Your idea works!

The solution:

1. A new JRBeanCollectionDataSource property added to de Class Page created always with a freshing 'new JRBeanCollectionDataSource':

public class Page {

Integer numberSession;

String day;

String session;// Mañana/Tarde

String startHour;

String endHour;

JRBeanCollectionDataSource students;

...}

2. The list students changed for a subreport. The datasource for this subreport is the new field $F{students}

Thank you very much Lucian.

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