I am cotinuing this thread as I have similar issue...any help is appreciated...I am new to jasper report.... I am creating a master report pointing to a XML datasource and sub report pointing to the Same datasource. When I run the report I get the following error. How do I connect the sub report to a XML datasource. Sub report properties that I have setup is the following. Connection type = Use a connection expression Connection Expression = ((net.sf.jasperreports.engine.data.JRXmlDataSource) $P{REPORT_DATA_SOURCE}).dataSource("/Northwind/Customers") Error: Caused by: java.lang.ClassCastException: net.sf.jasperreports.engine.data.JRXmlDataSource cannot be cast to java.sql.Connection at MasterReport_1289663361627_802700.evaluate Stack Trace: Error filling print... Error evaluating expression : Source text : ((net.sf.jasperreports.engine.data.JRXmlDataSource) $P{REPORT_DATA_SOURCE}).dataSource("/Northwind/Customers") java.lang.NoSuchMethodException: net.sf.jasperreports.engine.JasperReport.<init>(java.lang.String) at java.lang.Class.getConstructor0(Class.java:2706) at java.lang.Class.getConstructor(Class.java:1657) at com.jaspersoft.ireport.designer.compiler.prompt.Prompter$1.run(Prompter.java:230) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression : Source text : ((net.sf.jasperreports.engine.data.JRXmlDataSource) $P{REPORT_DATA_SOURCE}).dataSource("/Northwind/Customers") at net.sf.jasperreports.engine.fill.JREvaluator.evaluate(JREvaluator.java:195) at net.sf.jasperreports.engine.fill.JRCalculator.evaluate(JRCalculator.java:589) at net.sf.jasperreports.engine.fill.JRCalculator.evaluate(JRCalculator.java:557) at net.sf.jasperreports.engine.fill.JRFillElement.evaluateExpression(JRFillElement.java:929) at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluateSubreport(JRFillSubreport.java:332) at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluate(JRFillSubreport.java:263) at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(JRFillElementContainer.java:258) at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(JRFillBand.java:499) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillColumnBand(JRVerticalFiller.java:2033) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:760) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:270) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:128) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:946) at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:118) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:435) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:271) at com.jaspersoft.ireport.designer.compiler.IReportCompiler.run(IReportCompiler.java:989) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997) Caused by: java.lang.ClassCastException: net.sf.jasperreports.engine.data.JRXmlDataSource cannot be cast to java.sql.Connection at MasterReport_1289663361627_802700.evaluate(MasterReport_1289663361627_802700:189) at net.sf.jasperreports.engine.fill.JREvaluator.evaluate(JREvaluator.java:182) ... 18 more Print not filled. Try to use an EmptyDataSource
