Help with running an example

[Nathan]

I am new to java and I have to use JFreeChart for an project i have to make and in need of some help

I have this little piece of code from the web

Code: Select all

import org.jfree.chart.*;
import org.jfree.data.*;

public class TheFuture {

    public static void main(String[] args) {

	XYSeries series = new XYSeries("Linux Users");
	series.add(1995, 0.5);
	series.add(2000, 3.0);
	series.add(2010, 20.0);
	series.add(2020, 50.0);
	XYDataset dataset = new XYSeriesCollection(series);

	JFreeChart chart = ChartFactory.createXYAreaChart(
	     "Linux Users",
	     "Year",
	     "Millions",
	     dataset,
             org.jfree.chart.plot.PlotOrientation.VERTICAL,


             true,
	     false,
             false);

	try {
	  ChartUtilities.saveChartAsJPEG(new java.io.File("TheFuture.jpg"), chart, 500, 300);
	} catch (java.io.IOException exc) {
	    System.err.println("Error writing image to file");
	}
    }
}

and i can comile it with:
javac -classpath jfreechart-0.9.18.jar;lib\jcommon-0.9.3.jar TheFuture.java

but I can not execute it,
when i do:
java -classpath jfreechart-0.9.18.jar TheFuture
i get the message
Exception in thread "main" java.lang.NoClassDefFoundError: TheFuture

Please advise

Thanks Nathan

[david.gilbert]

You need to add the current directory to your classpath. Use '-classpath .;jfreechart-0.9.18.jar;lib\jcommon-0.9.3.jar' rather than '-classpath jfreechart-0.9.18.jar'.

[Nathan]

Thanks a lot
Learned again something!!

[jroch]

New to JFreeChart

Under Linux, I just cut/paste the extended classpath, but I keep having:

package org.jfree.chart does not exist
package org.jfree.data does not exist

What I did next is I compiled (I had to comment out all the JavaDoc parts in build.xml) but that didnt' change anything.

[JRoch]

I found out, it was just my path delimitators (not the same in Linux)!

It works now, I'm right in front of the beautiful graph from Nathan's example.

Thanks both!

[Jacky11287]

I try this sample:

Code: Select all

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.ChartFrame;

import org.jfree.data.DefaultPieDataset;

public class FirstJChart {

	public static void main(String[] args) 
	{
		// Creating Data Set
		DefaultPieDataset dataSet = new DefaultPieDataset();
		
		dataSet.setValue("Marcelo", 20);
		dataSet.setValue("Jacky", 33);
		dataSet.setValue("Johnny", 30);
		dataSet.setValue("Martin", 17);
		
		// Creating a pie chart
		JFreeChart chart = ChartFactory.createPieChart(
				"My first JFreeChart",
				dataSet,
				true,
				true,
				false				
		);
		
		// Displaying a pie chart
		ChartFrame chartFrame = new ChartFrame("My first Chart", chart);
		chartFrame.pack();
		chartFrame.setVisible(true);
	}
}

But I fail in running with the exception like:

java.lang.NoClassDefFoundError: org/apache/log4j/Logger
at org.jfree.chart.plot.PiePlot.<clinit>(PiePlot.java:309)
at org.jfree.chart.ChartFactory.createPieChart(ChartFactory.java:201)
at FirstJChart.main(FirstJChart.java:34)
Exception in thread "main"

What's wrong with my classpath settings? I can pass the compliation phrase~~~~

Thanks

[rose1]

But when I impile the program, lots of errors turn up, examples:
F:\dlhngr\iReport\iReport0.2.3\mypage\org\jfree\chart\ChartFactory.java:169: cannot resolve symbol
symbol : class Layer
location: package ui
import org.jfree.ui.Layer;
^
F:\dlhngr\iReport\iReport0.2.3\mypage\org\jfree\chart\ChartFactory.java:170: cannot resolve symbol
symbol : class RectangleEdge
location: package ui
import org.jfree.ui.RectangleEdge;
^
and so on.
why? Wait for your help... Thank you very much!!

[garv]

Classpath problem. Make sure the compiler can find the JCommon library.

[Guest]

I use JCreater Pro , I have import JCommon.jar in it through JDK Profiles.

[rose1]

I use JCreater Pro , I have import JCommon.jar in it through JDK Profiles.

[garv]

Hmm. Maybe you have an incompatible version of JCommon? What version of JFreeChart are you using?

All JCommon versions can be downloaded here:
http://sourceforge.net/project/showfile ... e_id=40079

[rose1]

I use version 0.8.16 of JFreeChart.
Please tell me where they should place and ClassPath how to set .

http://sourceforge.net/project/showfile ... e_id=40079[/quote]

[rose1]

Thank you, garv.
The problem has been sovled by me.It was because of the version and classpath . You are right. JCommon should place in lib and JFreechart is the same layer with lib.
Example: C:\java\jfreechart-0.9.16\jfreechart-9.16.jar;
C:\java\jfreechart-0.9.16\lib\jcommon-0.9.1.jar.
That's OK. Thank you !