Almost identical programs. One works, one doesn't

Question

I have 2 virtually identical programs. The only difference is the name of the class and hence one line of the program which refers to that name (to construct an instance of the class). The first runs fine. The line that's causing the problem (although it's in both programs and doesn't cause a problem in the first), which netbeans is reporting isn't a statement is
panel.add(chartPanel); Deatils of the error:

Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Uncompilable source code - not a statement
at splinepanel.SplinePanel.createContentPane(SplinePanel.java:139)
at splinepanel.SplinePanel.createAndShowGUI(SplinePanel.java:157)
at splinepanel.SplinePanel.access$000(SplinePanel.java:33)
at splinepanel.SplinePanel$1.run(SplinePanel.java:170)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

Can anyone help please? The first program (which works) is called PanelExmpale.java. The second program which doesn't work is as follows:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package splinepanel;

/*

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
* 
* */
import javax.swing.*;
import java.awt.*;       // Using AWT containers and components
import java.awt.event.*; // Using AWT events and listener interfaces
import javax.swing.*;    // Using Swing components and containers
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.ChartPanel;
import org.jfree.data.general.Series;
import org.jfree.util.PublicCloneable;
import org.jfree.chart.renderer.xy.XYSplineRenderer;

/**
 *
 * @author User
 */
public class SplinePanel{

    public JPanel createContentPane(){
        // This is where we'll put all our widgets
        // in the next tutorials!
        JPanel panel = new JPanel();

        /*

        SplineFactory s = new SplineFactory(); 

        double[] c = new double[12];
    c[0]  =   0.0;  // x0
    c[1]  =   0.0;  // y0
    c[2]  =   0.0;  // z0      

    c[3]  =   1.0;  // x1
    c[4]  =   1.0;  // y1
    c[5]  =   0.0;  // z1      

    c[6]  =   2.0;  // x2
    c[7]  =  -1.0;  // y2
    c[8]  =   0.0;  // z2      

    c[9]  =  10.0;  // x3
    c[10] =   0.0;  // y3
    c[11] =   0.0;  // z3      

    double[] spline1 = SplineFactory.createBezier (c,     20);
    double[] spline2 = SplineFactory.createCubic (c,      20);
    double[] spline3 = SplineFactory.createCatmullRom (c, 20); 

    /*

    System.out.println ("-- Bezier");
    for (int i = 0; i < spline1.length; i+=3)
      System.out.println (spline1[i] + "," + spline1[i+1] + "," + spline1[i+2]);

    System.out.println ("-- Cubic");
    for (int i = 0; i < spline2.length; i+=3)
      System.out.println (spline2[i] + "," + spline2[i+1] + "," + spline2[i+2]);

    System.out.println ("-- Catmull-Rom");
    for (int i = 0; i < spline3.length; i+=3)
      System.out.println (spline3[i] + "," + spline3[i+1] + "," + spline3[i+2]);

    */



        panel.setLayout(new BorderLayout());

        XYSeries series = new XYSeries("MyGraph");

        /*

        System.out.println ("-- Bezier");
        for (int i = 0; i < spline1.length; i+=3)
         System.out.println (spline1[i] + "," + spline1[i+1] + "," + spline1[i+2]);
        // series.add(spline1[i])

        System.out.println ("-- Cubic");
        for (int i = 0; i < spline2.length; i+=3)
         System.out.println (spline2[i] + "," + spline2[i+1] + "," + spline2[i+2]);

        System.out.println ("-- Catmull-Rom");
        for (int i = 0; i < spline3.length; i+=3)
         System.out.println (spline3[i] + "," + spline3[i+1] + "," + spline3[i+2]); 

         */

        /* 
        series.add(0, 1);
        series.add(1, 2);
        series.add(2, 5);
        series.add(7, 8);
        series.add(9, 10);
        */

         series.add(0, 1);
        series.add(1, 2);
        series.add(2, 5);
        series.add(7, 8);
        series.add(9, 10);

        XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(series);

        JFreeChart chart = ChartFactory.createXYLineChart(
                "XY Chart",
                "x-axis",
                "y-axis",
                dataset, 
                PlotOrientation.VERTICAL,
                true,
                true,
                false
                );
        ChartPanel chartPanel = new ChartPanel(chart);

        //chart.getXYPlot().setRenderer(new XYSplineRenderer());





        panel.add(chartPanel);
        //panel.setSize(800, 500);

        //content panes must be opaque



        panel.setOpaque(true); 
        return panel;  
    }

    private static void createAndShowGUI() {

        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new JFrame("[=] There's a JPanel in here! [=]");

        //Create and set up the content pane.
        SplinePanel demo = new SplinePanel();
        frame.setContentPane(demo.createContentPane());

        // The other bits and pieces that make our program a bit more stable.
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(1300, 650);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

Running a clean and build leads to 100 errors, the first of which is:

error: duplicate class: org.jfree.experimental.chart.demo.CombinedCategoryPlotDemo1 
public class CombinedCategoryPlotDemo1 extends ApplicationFrame {

Just to check (because sometimes weird things happen); have you tried doing a clean and build (assuming you're using an IDE) — Richard Tingle, Oct 01 '13 at 13:13
clean and build gives 100 errors, the first of which is Created dir: C:\Users\User\Documents\NetBeansProjects\SplinePanel\build\generated-sources\ap-source-output Compiling 2334 source files to C:\Users\User\Documents\NetBeansProjects\SplinePanel\build\classes C:\Users\User\Documents\NetBeansProjects\SplinePanel\src\lib\jfreechart-1.0.16\jfreechart-1.0.16\experimental\org\jfree\experimental\chart\demo\CombinedCategoryPlotDemo1.java:64: error: duplicate class: org.jfree.experimental.chart.demo.CombinedCategoryPlotDemo1 public class CombinedCategoryPlotDemo1 extends ApplicationFrame { — George Tomlinson, Oct 01 '13 at 13:19
sorry first error is error: duplicate class: org.jfree.experimental.chart.demo.CombinedCategoryPlotDemo1 public class CombinedCategoryPlotDemo1 extends ApplicationFrame { — George Tomlinson, Oct 01 '13 at 13:20
why don't you try taking the first program that works and refactor it using netbeans to the name of the second class. I hope that works, and shows you where the culprit lies in the current code. — Andromeda, Oct 01 '13 at 13:27
These things are usually; (1) a name clash or (2) netbeans keeping a cashe of old compiled code and getting confused — Richard Tingle, Oct 01 '13 at 13:29
And make sure that **SplinePanel** is in **SplinePanel.java** — Andromeda, Oct 01 '13 at 13:30
@bluesh34 It is? You just right click --> refactor --> rename. The whole 'the dialogue not fitting on the screen on small monitors' problem asside (grumble grumble) — Richard Tingle, Oct 01 '13 at 13:31
What i'm trying to do is keep PanelExample as it does something I want, but create SplinePanel which is to use features of PanelExample but do other stuff: i don't want to lose PanelExample: I'm sure this should be possible: I've no idea why it should be so difficult — George Tomlinson, Oct 01 '13 at 13:34
I tried removing and reinserting the API I'm using. Now I get this error for the same line: Uncompilable source code - Erroneous sym type: javax.swing.JPanel.add — George Tomlinson, Oct 01 '13 at 13:39
What i'm trying to do is just like 'save as' in Word or any software when you want to save a draft, but netbeans throws a wobbly- weird. this is one of those ones where you just sit and stare at the screen, completely bemused — George Tomlinson, Oct 01 '13 at 13:41

score 4 · Answer 1 · edited May 23 '17 at 11:53

As noted in comments and shown below, your code runs fine. It looks like you've got more than needed on the classpath in your build environment. On the command line, as shown here, you typically need just jfreechart and jcommon. In NetBeans, check the Library Manager, seen here and below.

NetBeans Ant Library Manager showing JFreeChart:

Ant Library Manager

Image, as run:

Code, as run:

import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
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.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

public class SplinePanel {

    public JPanel createContentPane() {
        JPanel panel = new JPanel(new GridLayout());
        XYSeries series = new XYSeries("MyGraph");
        series.add(0, 1);
        series.add(1, 2);
        series.add(2, 5);
        series.add(7, 8);
        series.add(9, 10);
        XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(series);
        JFreeChart chart = ChartFactory.createXYLineChart(
            "XY Chart",
            "x-axis",
            "y-axis",
            dataset,
            PlotOrientation.VERTICAL,
            true,
            true,
            false);
        ChartPanel chartPanel = new ChartPanel(chart);
        panel.add(chartPanel);
        panel.setOpaque(true);
        return panel;
    }

    private static void createAndShowGUI() {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new JFrame("[=] There's a JPanel in here! [=]");
        SplinePanel demo = new SplinePanel();
        frame.setContentPane(demo.createContentPane());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(640, 480);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

The jars in the classpath are identical to those for the program which works. netBeans reported a duplicate class error. I read on another similar question that clearing the netbeans cache solved the problem. I can't find jfreechart-1.0.16.jar. I only have jfreechart-1.0.16-demo.jar, but this is what I used for the progam which works, as I said. — George Tomlinson, Oct 03 '13 at 11:01
The JARs, as built, are in the `lib` directory of the distribution; I haven't had to nuke the cache in a while, but it may help; try building from the command line, too. — trashgod, Oct 03 '13 at 16:04

Almost identical programs. One works, one doesn't

1 Answers1