NoClassDefFoundError：org / apache / commons / logging / LogFactory

我是JasperReports的新手，我想将JasperReports集成到我的Java程序中，所以当我点击打印按钮时，程序将显示报告。 但是当我点击按钮时，我得到一个NoClassDefFoundError 。

码

JButton btnReport= new JButton("Report"); btnReport.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { try{ String fileName= "src/learnReport/Leaf_Grey.jasper"; Connection con = connect.getConnect(); File file = new File(NameFile); JasperReport jasperReport = (JasperReport) JRLoader.loadObject(file); JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null,con); JasperViewer.viewReport(jasperPrint,false); } catch(Exception ex){ System.out.println(ex); } } }); 

运行时错误

 Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory at net.sf.jasperreports.engine.util.JRLoader.(JRLoader.java:81) at learnReport.Learning$6.actionPerformed(Learning.java:195) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) 

Answer 1

你错过了jar文件“org-apache-commons-logging.jar”。 将此jar加载到您的项目中。 问题将得到解决。