为什么在调用JasperFillManager时在java.lang.Class.isAssignableFrom(Native Method)中得到java.lang.NullPointerException？

Question

当我在其参数中传递sql连接时,JasperFillManager抛出一个空指针异常,但是当我传递JRResultSetDatasource时它运行正常.

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)

当我在fillReport中传递连接时,它会给出异常.

jasperPrint = JasperFillManager.fillReport(jasperReport, map, reportConnection);

我也在使用子报表,这就是为什么我没有使用JRResultSetDatasource并使用连接.我只是坚持这个说明,当我传递JRResultSetDatasource它工作正常,当我也在HasMap参数中传递连接对象时,它给出与上面相同的错误.

Answer 1

我刚刚在两分钟前将我的iReport jar文件更新到最后一个版本