NoClassDefFoundError：org/apache/commons/logging/LogFactory

Question

我是JasperReports的新手，我想将JasperReports集成到我的 Java 程序中，因此当我单击打印按钮时，程序将显示报告。 但是当我点击按钮时，我得到了一个NoClassDefFoundError 。

代码

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.<clinit>(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

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

Answer 2

线程“AWT-EventQueue-0”中的错误异常 java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

解决方案

错过了 jar 文件“org-apache-commons-logging.jar”。

下载https://commons.apache.org/proper/commons-logging/download_logging.cgi

然后添加库

将此 jar 加载到您的项目中。 问题将得到解决。