JFreeChart: Ambiguous method signatures in DefaultCategoryDataSet

Question

Any idea how to work around this? I understand the error since double is an instance of Number, but the source is all compiled in the .jar archive. I'm using Java5. Perhaps this code worked ok in 1.4 maybe.
w3style:~/java/SunTracker d11wtq$ javac SunTracker.java
./org/w3style/suntracker/grapher/AzimuthAltitudeGraph.java:14: reference to addValue is ambiguous, both method
addValue(java.lang.Number,java.lang.Comparable,java.lang.Comparable)
in org.jfree.data.category.DefaultCategoryDataset and method
addValue(double,java.lang.Comparable,java.lang.Comparable)
in org.jfree.data.category.DefaultCategoryDataset match
                data.addValue(1.0, "Line 1", 1);
                    ^
1 error
w3style:~/java/SunTracker d11wtq$The issue is with the jfree package but I'm probably using it wrongly:
package org.w3style.suntracker.grapher;
import java.awt.image.BufferedImage;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.chart.plot.PlotOrientation;
public class AzimuthAltitudeGraph
     public BufferedImage getChartAsBufferedImage(int dimX, int dimY)
          DefaultCategoryDataset data = new DefaultCategoryDataset();
          data.addValue(1.0, "Line 1", 1);
          //etc etc (just testing now)
          JFreeChart chart = ChartFactory.createLineChart(
               "My line chart",
               "Azimuth",
               "Altitude",
               data,
               PlotOrientation.HORIZONTAL,
               true,
               true,
               false
          BufferedImage image = chart.createBufferedImage(dimX, dimY);
          return image;
}Relevant API notes:
JFreeChart ChartFactory.createLineChart
DefaultCategoryDataSet (where problem is)
PlotOrientation
Still quite new to java so this probably has the most obvious of solutions. I tried casting 1.0 as (double) but got no joy from that :(
Message was edited by:
d11wtq

Answer 1

Almost :) The first parameter being cast as (Number)
fixed it. Surely that's a bit messy though right?I don't like the approach of using Comparables as set identifiers and as ordinate values as is used by JFreeChart but it does seem to work. When I use DefaultCatagoryDataSet I make sure that I explicitly define the Comparable type for the 2nd and 3rd arguments for addValue and then autoboxing converts the first parameter to one of the Number types.