“线程中的异常”；AWT-EventQueue-0“；java.lang.NoClassDefFoundError:org/apache/commons/lang3/Validate

我正在尝试使用以下代码获取动态报告：

import java.sql.Connection;
import net.sf.dynamicreports.jasper.builder.JasperReportBuilder;
import net.sf.dynamicreports.report.builder.DynamicReports;
import net.sf.dynamicreports.report.builder.column.Columns;
import net.sf.dynamicreports.report.builder.component.Components;
import net.sf.dynamicreports.report.builder.datatype.DataTypes;
import net.sf.dynamicreports.report.constant.HorizontalAlignment;
import net.sf.dynamicreports.report.exception.DRException;
/**
 *
 * @author Nigel Backhurst
 */
public class UnsoldLots
{
    private Connection con;
    private Seller seller;
    private int auctionID;

    public UnsoldLots(Connection c, Seller s, int a)
    {
        con = c;
        seller = s;
        auctionID = a;
        String sellerName = seller.FirstName + " " + seller.Surname;
        String sellerID = seller.idSeller;
        String auction = Integer.toString(a);
        String sql = "SELECT LotNumber, Description FROM lots WHERE "
               +  "AuctionID = \'" + auction + "\' AND idSellers = \'"
               +  sellerID + "\' AND LotSold = \'F\'";
        String rTitle = "Unsold Lots for " + sellerName;
        JasperReportBuilder report = DynamicReports.report();
         //create a new report
         report
        .columns(
                Columns.column("Lot", "LotNumber", DataTypes.integerType()),
                Columns.column("Description", "Description", DataTypes.stringType())
            )
            .title(
            //title of the report
            Components.text(rTitle )
            .setHorizontalAlignment(HorizontalAlignment.CENTER))
            .pageFooter(Components.pageXofY())
            .setDataSource( sql , con);
          try 
          {
            //show the report
            report.show();
          } catch (DRException e) 
          {
            e.printStackTrace();
          } 


    }
}

但是，我在运行代码时遇到以下异常，无法找出原因：

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/apache/commons/lang3/Validate
    at net.sf.dynamicreports.report.base.component.DRList.setType(DRList.java:80)
    at net.sf.dynamicreports.report.base.component.DRList.<init>(DRList.java:52)
    at net.sf.dynamicreports.report.base.DRBand.<init>(DRBand.java:44)
    at net.sf.dynamicreports.report.base.DRReport.init(DRReport.java:144)
    at net.sf.dynamicreports.report.base.DRReport.<init>(DRReport.java:126)
    at net.sf.dynamicreports.report.builder.ReportBuilder.<init>(ReportBuilder.java:75)
    at net.sf.dynamicreports.jasper.builder.JasperReportBuilder.<init>(JasperReportBuilder.java:117)
    at net.sf.dynamicreports.report.builder.DynamicReports.report(DynamicReports.java:120)
    at iea.auction.manager.UnsoldLots.<init>(UnsoldLots.java:45)

线程“AWT-EventQueue-0”java.lang.NoClassDefFoundError中的异常：org/apache/commons/lang3/Validate 位于net.sf.dynamicreports.report.base.component.DRList.setType（DRList.java:80） 位于net.sf.dynamicreports.report.base.component.DRList.（DRList.java:52） 位于net.sf.dynamicreports.report.base.DRBand.（DRBand.java:44） 位于net.sf.dynamicreports.report.base.DRReport.init（DRReport.java:144） 位于net.sf.dynamicreports.report.base.DRReport.（DRReport.java:126） 位于net.sf.dynamicreports.report.builder.ReportBuilder.（ReportBuilder.java:75） 位于net.sf.dynamicreports.jasper.builder.JasperReportBuilder.（JasperReportBuilder.java:117） 位于net.sf.dynamicreports.report.builder.dynamicreports.report（dynamicreports.java:120） 在iea.auction.manager.UnsoldLots.（UnsoldLots.java:45）

---

我怀疑我可能遗漏了一个include，但无法确定是哪个。

您遗漏了类路径中的

commons-lang3.jar

。下载并将其添加到您的类路径。

NoClassDefFoundError表示什么？