Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefF

[Nestor]

Bonjour

Je rencontre le probleme suivant: Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/jfree/data/category/categoryDataset.
Pouvez-vous m'aider s'il vus plait.

Nestor

[Nestor]

Hello,

Sorry for the french spoken while exposing my question. In fact I'm using JFreeChat and having the following error : Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/jfree/data/category/categoryDataset. I made all the necessary importations such as :
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

but the problem still come out. Can anyone help me please?

Many thanks in advance.

Nestor

[david.gilbert]

That's an odd error message. Double check that you don't have two versions of JFreeChart on your class path, because that can sometimes be the root cause.