Problems importing Jar files

Hi
I have tried to implement a sample version of jfreechart which is a component for graphing but unfortunatly there is an error with importing some of the libraries i have added all the . jar files to the Class Path and i have opened the .jar file in net beans so i dont know what the problem is
Problem is with the lines
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
It tells me that org/jfree/chart/demo/LineChartDemo1.java [60:1] package org.jfree.ui does not exist
C:\j2sdk1.4.2_03\lib\jfreechart-0.9.16\jfreechart-0.9.16.jar;
C:\j2sdk1.4.2_03\lib\jfreechart-0.9.16\lib\jcommon-0.9.1.jar;
C:\j2sdk1.4.2_03\lib\jfreechart-0.9.16\lib\servlet.jar;C:\j2sdk1.4.2_03\lib\jfreechart-0.9.16\lib\gnujaxp.jar
Refereence at http://www.jfree.org/jfreechart/index.html

Check to make sure that the jar files have the above mentioned classes.
Do a jar -tvf to find the contents of the JAR file.
Next check your classpath entries again. Also adding these libraries to the JDK lib directory will not automatically add them to the classpath. So check to make sure they are added and if you are using an IDE, check the command line the IDE produces (most IDE's do that) to make sure your classes are there in the -classpath option.
Vijay

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