Ggtcf

I'm trying to generate multiple charts using the approach described here:
How to create multiple charts of same type but with different dataseries using JRBeanCollectionDatasource in Jasperreports

I need to generate multiple charts in a report given a List<List<ChartBean<Double,Double>>
which is populated with the data I get from a file.

ChartBean is declared as follows:

public class ChartBean<T,U> 
 T xCoordinate;
 U yCoordinate;
 String series;

 public ChartBean(T x,U y,String series) 
 this.xCoordinate = x;
 this.yCoordinate = y;
 this.series = series;
 

 public void setxCoordinate(T x) 
 this.xCoordinate = x;
 

 public void setyCoordinate(U y) 
 this.yCoordinate = y;
 

 public T getxCoordinate() 
 return xCoordinate;
 

 public U getyCoordinate() 
 return yCoordinate;
 

 public String setseries() 
 return series;
 

 public String getseries() 
 return series; 
 

I pass the parameters to the template generator in the following way
parameters.put("XYDataSource", values); , where values contains the list of list of coordinates.

What I get is that my application hangs and does not generate any report. I checked multiple times the content of the XML and it seems in line with what is described in the post. I tried also to generate one chart (without using list of lists) and it works.

I have a top report whose summary band contains a sub report "sub_charts.xml".
In its detail band I put another subreport which contains the line chart and I use the "_THIS" field to pass the List<ChartBean<Double,Double>
The content of the subreports is reported here.

sub_charts.jrxml

<?xml version="1.0" encoding="UTF-8"?>
<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="subcharts_2" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="97e07501-37b1-4c04-970b-33f120c8264d">
<parameter name="REPORT_DIR" class="java.lang.String"/>
<field name="_THIS" class="java.util.List">
 <fieldDescription><![CDATA[_THIS]]></fieldDescription>
</field>
<detail>
 <band height="359">
 <subreport>
 <reportElement x="22" y="25" width="510" height="320" uuid="6ea2325b-969e-472a-9d49-d5c33667fab5"/>
 <dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F_THIS)]]></dataSourceExpression>
 <subreportExpression><![CDATA[$PREPORT_DIR+"/sub_chart.jasper"]]></subreportExpression>
 </subreport>
 </band>
</detail>

sub_chart.jrxml

<?xml version="1.0" encoding="UTF-8"?>
<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="subchart_2" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="6cdd6eb2-73da-4026-823b-574910e37c68">
<field name="series" class="java.lang.String"/>
<field name="xCoordinate" class="java.lang.Double"/>
<field name="yCoordinate" class="java.lang.Double"/>
<summary>
 <band height="270">
 <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
 <xyLineChart>
 <chart evaluationTime="Report">
 <reportElement isPrintRepeatedValues="false" x="0" y="0" width="555" height="270" uuid="4bfd2379-7617-47fb-9c2a-4eeb0b72eadf"/>
 <chartTitle/>
 <chartSubtitle/>
 <chartLegend/>
 </chart>
 <xyDataset>
 <xySeries autoSort="true">
 <seriesExpression><![CDATA[$Fseries]]></seriesExpression>
 <xValueExpression><![CDATA[$FxCoordinate]]></xValueExpression>
 <yValueExpression><![CDATA[$FyCoordinate]]></yValueExpression>
 </xySeries>
 </xyDataset>
 <linePlot>
 <plot/>
 <categoryAxisFormat>
 <axisFormat labelColor="#000000" tickLabelColor="#000000" axisLineColor="#000000"/>
 </categoryAxisFormat>
 <valueAxisFormat>
 <axisFormat labelColor="#000000" tickLabelColor="#000000" axisLineColor="#000000"/>
 </valueAxisFormat>
 </linePlot>
 </xyLineChart>
 </band>
</summary>