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JasperFillManager is throwing a null pointer exception when I pass sql connection in its parameter but it runs fine when I pass JRResultSetDatasource. java.lang.NullPointerException at java.lang.Class.isAssignableFrom(Native Method) at net.sf.jasperreports.engine.fill.JRFillTextField.getFormat(JRFillTextField.java:706) at net.sf.jasperreports.engine.fill.JRFillTextField.evaluateText(JRFillTextField.java:394) at net.sf.jasperreports.engine.fill.JRFillTextField.evaluate(JRFillTextField.java:368) 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:2036) 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.JRBaseFiller.fill(JRBaseFiller.java:845) at net.sf.jasperreports.engine.fill.JRFillSubreport.fillSubreport(JRFillSubreport.java:609) at net.sf.jasperreports.engine.fill.JRSubreportRunnable.run(JRSubreportRunnable.java:59) at net.sf.jasperreports.engine.fill.JRThreadSubreportRunner.run(JRThreadSubreportRunner.java:205) at java.lang.Thread.run(Unknown Source) when I pass connection in fillReport it gives exception. jasperPrint = JasperFillManager.fillReport(jasperReport, map, reportConnection); I am also using a subreport so that is why I am not using JRResultSetDatasource and using connection. I am just stuck into this note that when I pass JRResultSetDatasource it works fine and when I also pass connection object in a HasMap parameter it gives same error

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