JAVA报表问题？

[lzf0112]

我从网上下载了有关报表的例子：package jfreereport;


import java.io.*;
import java.awt.Color;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Point2D;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;

import org.jfree.report.Boot;
import org.jfree.report.ElementAlignment;
import org.jfree.report.JFreeReport;
import org.jfree.report.ReportProcessingException;
import org.jfree.report.elementfactory.TextFieldElementFactory;
import org.jfree.report.modules.gui.base.PreviewDialog;
//import org.jfree.ui.FloatDimension;


public class HelloWorld
{
/**
* 处理窗口关闭事件
*/
protected static class CloseHandler extends WindowAdapter
{
public void windowClosing(final WindowEvent event)
{
System.exit(0);
}
}

/**
* 创建和显示简单的报表
*/
public HelloWorld()
{
// 获得创建报表需要用到的数据
final TableModel data = createData();
//获得报表要用到的报表定义内容
final JFreeReport report = createReportDefinition();
//将报表定义和数据结合
report.setData(data);
try
{
//将生成的报表放到预览窗口中
final PreviewDialog preview = new PreviewDialog(report);
preview.addWindowListener(new CloseHandler());
preview.pack();
//显示报表预览窗口
preview.setVisible(true);
}
catch(ReportProcessingException e1)
{
System.out.print(e1);
}

}

/**
* 创建生成报表需要用到的数据
*
* @返回一个TableModel实例
*/
private TableModel createData()
{

final Object[] columnNames = new String[]{"Column1", "Column2"};
final DefaultTableModel result = new DefaultTableModel(columnNames, 100);
int rownum = 0;
int colnum = 0;
for (;rownum < 100 ; rownum++)
{
result.setValueAt("say Hello " + rownum + "次", rownum, 0);
result.setValueAt("say World " + rownum + "次" , rownum, 1);
}

return result;

}

/**
* 创建一个报表定义
*
* @返回一个报表定义实例
*/
private JFreeReport createReportDefinition()
{

final JFreeReport report = new JFreeReport();
report.setName("A Very Simple Report");
/**
* 定义要显示报表第一列的样式
*/
TextFieldElementFactory factory = new TextFieldElementFactory();
factory.setName("T1");
factory.setAbsolutePosition(new Point2D.Float(0, 0));
//factory.setMinimumSize(new FloatDimension(150, 20));
factory.setColor(Color.black);
factory.setHorizontalAlignment(ElementAlignment.LEFT);
factory.setVerticalAlignment(ElementAlignment.MIDDLE);
factory.setNullString("-");
factory.setFieldname("Column1");
report.getItemBand().addElement(factory.createElement());
/**
* 定义要显示报表第二列的样式
*/
factory = new TextFieldElementFactory();
factory.setName("T2");
factory.setAbsolutePosition(new Point2D.Float(200, 0));
//factory.setMinimumSize(new FloatDimension(150, 20));
factory.setColor(Color.black);
factory.setHorizontalAlignment(ElementAlignment.LEFT);
factory.setVerticalAlignment(ElementAlignment.MIDDLE);
factory.setNullString("-");
factory.setFieldname("Column2");
report.getItemBand().addElement(factory.createElement());
/**
* 返回一个报表定义的实例
*/
return report;

}

public static void main(final String[] args)
{
// 初始化JFreeReport
Boot.start();

//调用演示实例
new HelloWorld();
}
}



可是我一运行为什么老是提示说：cannot access org.jfree.util.StackableException; org.jfree.util.StackableException at line 153, column 11
就是ReportProcessingException好像不行还是什么的，望各位给与指点，谢谢！！1

[此电脑]

需要导入 Jfreechat报表的包
才可以的.