无法执行 JasperReports：ClassNotFoundException [重复]答案

【问题标题】：Unable to execute JasperReports: ClassNotFoundException [duplicate]无法执行 JasperReports：ClassNotFoundException [重复]
【发布时间】：2017-04-11 21:22:12
【问题描述】：

尝试从 Eclipse 执行 JasperReports 6.3.1 简单报告：

package test.jaspertest;

import java.util.HashMap;

import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.JREmptyDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;

public class JasperTest {

    public static void main(String[] args) {
        System.out.println("Start");

        try {
            JasperReport jasperReport = JasperCompileManager.compileReport("reports/simple.xml");
            JasperPrint jasperPrint = JasperFillManager.fillReport(
                jasperReport,
                new HashMap(),
                new JREmptyDataSource());
            JasperExportManager.exportReportToPdfFile(jasperPrint, "reports/simple.pdf");
        } catch (JRException e) {
            e.printStackTrace();
        }

    }

}

有这个消息：

Apr 11, 2017 1:59:41 PM net.sf.jasperreports.extensions.DefaultExtensionsRegistry loadRegistries
WARNING: Extension resource jar:file:/C:/Portable%20Programs/eclipse/packages/jasperreports/dist/jasperreports-javaflow-6.3.1.jar!/jasperreports_extension.properties was found to be a duplicate of jar:file:/C:/Portable%20Programs/eclipse/packages/jasperreports/dist/jasperreports-6.3.1.jar!/jasperreports_extension.properties in classloader sun.misc.Launcher$AppClassLoader@1d16e93
Start
Exception in thread "main" java.lang.NoClassDefFoundError: com/lowagie/text/DocumentException
    at net.sf.jasperreports.engine.JasperExportManager.exportToPdfFile(JasperExportManager.java:150)
    at net.sf.jasperreports.engine.JasperExportManager.exportReportToPdfFile(JasperExportManager.java:503)
    at test.jaspertest.JasperTest.main(JasperTest.java:24)
Caused by: java.lang.ClassNotFoundException: com.lowagie.text.DocumentException
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 3 more

Java 版本 1.8.0.121。我对Java不是很熟悉，所以有人可以帮我解决这个问题吗？提前致谢！

【问题讨论】：

标签： java jasper-reports classnotfoundexception

【解决方案1】：

您错过了类路径中的itext-2.1.7.jar。添加它，错误就会消失。 itext.jar 是 jarperReport 需要的依赖项

【讨论】：