一个Eclips运行JFreeChart的超郁闷错误 请帮帮我

这是错误：

Exception in thread "main" java.lang.UnsatisfiedLinkError: no awt in java.library.path

at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1682)

at java.lang.Runtime.loadLibrary0(Runtime.java:822)

at java.lang.System.loadLibrary(System.java:992)

at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50)

at java.security.AccessController.doPrivileged(Native Method)

at java.awt.Toolkit.loadLibraries(Toolkit.java:1509)

at java.awt.Toolkit.<clinit>(Toolkit.java:1530)

at java.awt.Font.<clinit>(Font.java:141)

at org.jfree.chart.axis.Axis.<clinit>(Axis.java:131)

at org.jfree.chart.ChartFactory.createBarChart3D(ChartFactory.java:922)

at com.test.BarChartDemo.main(BarChartDemo.java:14)



我的软件开发环境： eclipse3.2 / tomcat5.5.9 / jdk1.5

引入的jar包： gnujaxp.jar / jcommon-1.0.13.jar / jfreechart-1.0.10.jar

代码是：

package com.test;



import java.io.*;

import org.jfree.data.category.CategoryDataset;

import org.jfree.data.category.DefaultCategoryDataset;



import org.jfree.chart.ChartFactory;

import org.jfree.chart.ChartUtilities;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.plot.PlotOrientation;

public class BarChartDemo {

public static void main(String[] args) throws IOException{

CategoryDataset dataset = getDataSet();//创建用于图形生成所要的数据集对象

JFreeChart chart = ChartFactory.createBarChart3D(

"水果产量图", // 图表标题

"水果", // 目录轴的显示标签

"产量", // 数值轴的显示标签

dataset, // 数据集

PlotOrientation.VERTICAL, // 图表方向：水平、垂直

true, // 是否显示图例(对于简单的柱状图必须是false)

false, // 是否生成工具

false // 是否生成URL链接

);

//把图片写入文件中


FileOutputStream fos_jpg = null;

try {

fos_jpg = new FileOutputStream("D:\fruit.jpg");

ChartUtilities.writeChartAsJPEG(fos_jpg,100,chart,400,300,null);

} finally {

try {

fos_jpg.close();

} catch (Exception e) {}

}

}

private static CategoryDataset getDataSet() {//获取一个演示用的简单数据集对象

DefaultCategoryDataset dataset = new DefaultCategoryDataset();

dataset.addValue(100, "北京", "苹果");

dataset.addValue(100, "上海", "苹果");

dataset.addValue(100, "广州", "苹果");

dataset.addValue(200, "北京", "梨子");

dataset.addValue(200, "上海", "梨子");

dataset.addValue(200, "广州", "梨子");

dataset.addValue(300, "北京", "葡萄");

dataset.addValue(300, "上海", "葡萄");

dataset.addValue(300, "广州", "葡萄");

dataset.addValue(400, "北京", "香蕉");

dataset.addValue(400, "上海", "香蕉");

dataset.addValue(400, "广州", "香蕉");

dataset.addValue(500, "北京", "荔枝");

dataset.addValue(500, "上海", "荔枝");

dataset.addValue(500, "广州", "荔枝");

return dataset;

}

}

web.xml中配置：

<servlet>

<servlet-name>DisplayChart</servlet-name>

<servlet-class>

org.jfree.chart.servlet.DisplayChart

</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>DisplayChart</servlet-name>

<url-pattern>/servlet/DisplayChart</url-pattern>

</servlet-mapping>

请问我的错误究竟在哪？