JFreeChart运行时报Using:org.jfree.chart.encoders.SunJPEGEncoderAdapter
运行环境:Jdk1.5,Tomcat5.0,程序可以正常运行,但控制台出现Using:
org.jfree.chart.encoders.SunJPEGEncoderAdapter

原文件: <%@ page contentType= "text/html; charset=gb2312 " language= "java " import= "java.sql.* " errorPage= " " %>
<%@ page import= "org.jfree.data.* " %>
<%@ page import= "org.jfree.chart.* " %>
<%@ page import= "org.jfree.chart.servlet.* " %>
<%@ page import= "org.jfree.chart.plot.* " %>
<%@ page import= "org.jfree.data.category.DefaultCategoryDataset " %>

<%

DefaultCategoryDataset dataset=new DefaultCategoryDataset();
dataset.addValue(300, "广州 ", "苹果 ");
dataset.addValue(200, "广州 ", "梨子 ");
dataset.addValue(500, "广州 ", "葡萄 ");
dataset.addValue(340, "广州 ", "芒果 ");
dataset.addValue(280, "广州 ", "荔枝 ");

JFreeChart chart = ChartFactory.createBarChart3D( "水果销量统计图 ",
"水果 ",
"销量 ",
dataset,
PlotOrientation.VERTICAL,

false,
false,
false);

String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, null, session);

//String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename= " + filename;
String graphURL = request.getContextPath() + "/DisplayChart?filename= " + filename;

%>
<img src= " <%= graphURL %> " width=500 height=300 border=0 usemap= "# <%= filename %> ">


[解决办法]

可能是少了一些相关的jar包吧.