Following the answer from here : How to create multiple charts of same type but with different dataseries using JRBeanCollectionDatasource in Jasperreports
I managed to at least create charts with my nested list. My java object :
public class PoolUserLoginsVO {
private int userLogins;
private String poolId;
private Date date;
//constructor + getter/setters
userLogins is the y coordinate value, the chart is a timeseries chart so the x coordinate is the date. poolId is the series in which the coordinates belong to.
I get the list of values I need for each series, and since there are multiple series, I have a list of a list that I pass to the parameter map to Jasper Reports.
My Jasper Reports :
Main jasper (the whole document is quite long so only the relevant part) :
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.10.0.final using JasperReports Library version 6.10.0-unknown -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="test" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="fbaeab5e-6793-456e-9567-e0c5af982904">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
<parameter name="poolLogins" class="java.util.List"/>
<queryString>
<![CDATA[]]>
</queryString>
<background>
<band splitType="Stretch"/>
</background>
<detail>
<band height="223">
<subreport>
<reportElement x="0" y="0" width="550" height="200" uuid="9f8a2d4a-1d90-4f88-a08c-1ea2604360c5"/>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($P{poolLogins})]]></dataSourceExpression>
<subreportExpression><![CDATA["sub_charts.jasper"]]></subreportExpression>
</subreport>
</band>
</detail>
</jasperReport>
$P{poolLogins} is a List<List<PoolUserLoginsVO>.
sub_charts.jasper :
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.10.0.final using JasperReports Library version 6.10.0-unknown -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="sub_charts" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="bc8c76ba-0b85-4522-bf67-4c62ae87202b">
<field name="_THIS" class="java.util.List">
<fieldDescription><![CDATA[_THIS]]></fieldDescription>
</field>
<detail>
<band height="237" splitType="Stretch">
<subreport>
<reportElement x="0" y="20" width="540" height="200" uuid="1ec1f733-ffee-46f3-859c-f774e5277d19"/>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{_THIS})]]></dataSourceExpression>
<subreportExpression><![CDATA["sub_chart.jasper"]]></subreportExpression>
</subreport>
</band>
</detail>
</jasperReport>
sub_chart.jasper :
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.10.0.final using JasperReports Library version 6.10.0-unknown -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="sub_chart" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="4ce41625-c60b-4759-acbe-5fe12a013fb2">
<queryString>
<![CDATA[]]>
</queryString>
<field name="userLogins" class="java.lang.Integer"/>
<field name="poolId" class="java.lang.String"/>
<field name="date" class="java.util.Date"/>
<background>
<band splitType="Stretch"/>
</background>
<detail>
<band height="210" splitType="Stretch">
<timeSeriesChart>
<chart evaluationTime="Report">
<reportElement x="0" y="20" width="540" height="180" uuid="874eee5e-1e71-4870-906b-ef71ef91d274"/>
<chartTitle/>
<chartSubtitle/>
<chartLegend/>
</chart>
<timeSeriesDataset>
<timeSeries>
<seriesExpression><![CDATA[$F{poolId}]]></seriesExpression>
<timePeriodExpression><![CDATA[$F{date}]]></timePeriodExpression>
<valueExpression><![CDATA[$F{userLogins}.intValue()]]></valueExpression>
</timeSeries>
</timeSeriesDataset>
<timeSeriesPlot>
<plot/>
<timeAxisFormat>
<axisFormat labelColor="#000000" tickLabelColor="#000000" axisLineColor="#000000"/>
</timeAxisFormat>
<valueAxisFormat>
<axisFormat labelColor="#000000" tickLabelColor="#000000" axisLineColor="#000000"/>
</valueAxisFormat>
</timeSeriesPlot>
</timeSeriesChart>
</band>
</detail>
</jasperReport>
The PDF and the charts successfully generate. But there are two problems :
1) I get like 30 pages of charts, even though there is only 4 series. Each series is duplicated exactly 30 times (the number of coordinates in each series). The generated charts are all correct though.
2) I don't want separate charts. I want all the series to be in one single chart, with different colors.
What am I doing wrong here?
Edit :
Main :
public class testmain {
public static void main(String[] args) {
int threshold = 30;
List<List<PoolUserLoginsVO>> poolLogins = new ArrayList<>();
List<PoolUserLoginsVO> userLogins = new ArrayList<>();
for (int i = 0; i < threshold; ++i) {
LocalDate localDate = LocalDate.now().minusDays(threshold - i - 1);
Date date = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
PoolUserLoginsVO logins = new PoolUserLoginsVO(i, "pool1", date);
userLogins.add(logins);
}
poolLogins.add(userLogins);
List<PoolUserLoginsVO> userLogins2 = new ArrayList<>();
for (int i = 0; i < threshold; ++i) {
LocalDate localDate = LocalDate.now().minusDays(threshold - i - 1);
Date date = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
PoolUserLoginsVO logins = new PoolUserLoginsVO(1, "pool2", date);
userLogins2.add(logins);
}
poolLogins.add(userLogins2);
List<PoolUserLoginsVO> userLogins3 = new ArrayList<>();
for (int i = threshold; i > 0; --i) {
LocalDate localDate = LocalDate.now().minusDays(threshold - i - 1);
Date date = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
PoolUserLoginsVO logins = new PoolUserLoginsVO(i, "pool3", date);
userLogins3.add(logins);
}
poolLogins.add(userLogins3);
JRBeanCollectionDataSource vmsJRBean = new JRBeanCollectionDataSource(poolLogins);
Map<String, Object> parameters = new HashMap<String, Object>();
parameters.put("poolLogins", poolLogins);
File file = new File("report.pdf");
try {
FileOutputStream fop = new FileOutputStream(file);
JasperPrint jasperPrint = JasperFillManager.fillReport("test.jasper", parameters, new JREmptyDataSource());
JasperExportManager.exportReportToPdfStream(jasperPrint, fop);
fop.flush();
fop.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JRException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
I finally fixed it! I shouldn't have followed the other question/answer that I linked in OP. That question I think was asking how to create multiple charts, and I wanted only one chart but with all the series combined together. I fixed the problem by not putting my data in a nested list. I just put all the data in a single 1 dimensional list; since each PoolUserLoginsVO already contains which poolId it belongs to, there was no point in having a nested list to begin with (unless I wanted multiple charts for each pool I guess). So I passed in a single list, then modified the main jasper report to pass straight to the sub_chart.jasper instead of sub_charts.jasper (I deleted sub_charts.jasper since it was no longer needed). The result?
Success!