Hi, there is a solution based on using a JRMapCollectionDataSource for your Pie Chart. You need to add a dataset to your report (add empty data source). (in ireport right clik in your report name and click on add Dataset) in the added source add tow fields for the values and for the label/name for example key an val, you will use them in you pie chart create a new pie char and choose your dataset the new adder dataset. this will allow you to find your variable key and val, to use them as key expression $F{key} and value expression $F{val) Now open you pie chart properties by righ click on the pie object => pie Data. go to : connection / Datasource expression, and choose use data source expression Edit the expression to use a JRMapCollectionDataSource with your own calculated variables (in the example we uses var1, var2, var3 an var4) example new net.sf.jasperreports.engine.data.JRMapCollectionDataSource () [ ["key" : "a", val: $V{var1}], ["key" : "b", val: $V{var2}], ["key" : "c", val: $V{var3}], ["key" : "d", val: $V{var4}] ])[/code]The default label uses the key, you can change it in char Data - > Details you can fin more details on this link : https://community.jaspersoft.com/wiki/how-pass-java-list-or-list-chart-datasource-jrxml-based-reports Below the JRXML file using ireport 5.6 of the example : <?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="pie chart variables" language="groovy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="0a8e5b1c-8d35-4290-a283-c7fb4e197131"> <property name="ireport.zoom" value="1.0"/> <property name="ireport.x" value="0"/> <property name="ireport.y" value="0"/> <subDataset name="mydataset" uuid="37fb9ab4-ec80-4095-9857-01219a239b9b"> <field name="key" class="java.lang.String"/> <field name="val" class="java.lang.Integer"/> </subDataset> <variable name="var1" class="java.lang.Integer"> <variableExpression><![CDATA[35*3]]></variableExpression> <initialValueExpression><![CDATA[]]></initialValueExpression> </variable> <variable name="var2" class="java.lang.Integer"> <variableExpression><![CDATA[20*1.5]]></variableExpression> <initialValueExpression><![CDATA[]]></initialValueExpression> </variable> <variable name="var3" class="java.lang.Integer"> <variableExpression><![CDATA[25*5]]></variableExpression> <initialValueExpression><![CDATA[]]></initialValueExpression> </variable> <variable name="var4" class="java.lang.Integer"> <variableExpression><![CDATA[40]]></variableExpression> <initialValueExpression><![CDATA[]]></initialValueExpression> </variable> <background> <band splitType="Stretch"/> </background> <title> <band height="79" splitType="Stretch"/> </title> <pageHeader> <band height="35" splitType="Stretch"/> </pageHeader> <columnHeader> <band height="61" splitType="Stretch"/> </columnHeader> <detail> <band height="162" splitType="Stretch"> <pie3DChart> <chart evaluationTime="Report"> <reportElement x="135" y="16" width="238" height="125" uuid="71a39643-6af3-4124-977a-16a74385968c"/> <chartTitle/> <chartSubtitle/> <chartLegend/> </chart> <pieDataset> <dataset> <datasetRun subDataset="mydataset" uuid="a159ae9c-736c-447c-9909-f883471c59bf"> <dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRMapCollectionDataSource ( [ ["key" : "a", val: $V{var1}], ["key" : "b", val: $V{var2}], ["key" : "c", val: $V{var3}], ["key" : "d", val: $V{var4}] ])]]></dataSourceExpression> </datasetRun> </dataset> <keyExpression><![CDATA[$F{key}]]></keyExpression> <valueExpression><![CDATA[$F{val}]]></valueExpression> <labelExpression><![CDATA[$F{key}+":"+$F{val}]]></labelExpression> </pieDataset> <pie3DPlot> <plot/> <itemLabel/> </pie3DPlot> </pie3DChart> </band> </detail> <columnFooter> <band height="45" splitType="Stretch"/> </columnFooter> <pageFooter> <band height="54" splitType="Stretch"/> </pageFooter> <summary> <band height="42" splitType="Stretch"/> </summary></jasperReport>[/code]
