how to execute simple swing program

[Robin Clark]

I am able to compile a very simple Swing example:

  
/*
 * SimpleTableDemo.java is a 1.4 application that requires no other files.
 */
 
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
 
public class SimpleTableDemo extends JPanel {
    private boolean DEBUG = false;
 
    public SimpleTableDemo() {
        super(new GridLayout(1,0));
 
        String[] columnNames = {"First Name",
                                "Last Name",
                                "Sport",
                                "# of Years",
                                "Vegetarian"};
 
        Object[][] data = {
            {"Mary", "Campione",
             "Snowboarding", new Integer(5), new Boolean(false)},
            {"Alison", "Huml",
             "Rowing", new Integer(3), new Boolean(true)},
            {"Kathy", "Walrath",
             "Knitting", new Integer(2), new Boolean(false)},
            {"Sharon", "Zakhour",
             "Speed reading", new Integer(20), new Boolean(true)},
            {"Philip", "Milne",
             "Pool", new Integer(10), new Boolean(false)}
        };
 
        final JTable table = new JTable(data, columnNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
 
        if (DEBUG) {
            table.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    printDebugData(table);
                }
            });
        }
 
        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);
 
        //Add the scroll pane to this panel.
        add(scrollPane);
    }
 
    private void printDebugData(JTable table) {
        int numRows = table.getRowCount();
        int numCols = table.getColumnCount();
        javax.swing.table.TableModel model = table.getModel();
 
        System.out.println("Value of data: ");
        for (int i=0; i < numRows; i++) {
            System.out.print("    row " + i + ":");
            for (int j=0; j < numCols; j++) {
                System.out.print("  " + model.getValueAt(i, j));
            }
            System.out.println();
        }
        System.out.println("--------------------------");
    }
 
    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);
 
        //Create and set up the window.
        JFrame frame = new JFrame("SimpleTableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
        //Create and set up the content pane.
        SimpleTableDemo newContentPane = new SimpleTableDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);
 
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }
 
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}
 

But when I try to run it, I get the following error:

C:\download>java SimpleTableDemo
Exception occurred during event dispatching:
java.lang.NoSuchMethodError
        at SimpleTableDemo.createAndShowGUI(SimpleTableDemo.java:80)
        at SimpleTableDemo.access$100(SimpleTableDemo.java:14)
        at SimpleTableDemo$2.run(SimpleTableDemo.java:101)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
 
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)
  

How do I fix this problem?

[Steven Bell]

This sounds like a classpath issue. If you do a search for classpath here you should find quite a bit.

[Robin Clark]

Yes, I agree. Here is what my classpath is set to:

  
C:\download>set classpath
CLASSPATH=.;c:\junit3.8.1\junit.jar;c:\jakarta-log4j-1.2.8\dist\lib\log4j-1.2.8.
jar;c:\jwsdp-1.3\jaxp\lib\jaxp-api.jar;c:\apache-ant-1.6.0\lib\xercesImpl.jar;c:
\apache-ant-1.6.0\lib\xml-apis.jar

The very first entry in my classpath is the current directory which is where I am trying to execute the program. So I do not see the problem...

[Steven Bell]

And there is a SimpleTableDemo.class file in the download directory?

[Robin Clark]

Yes, the SimpleTableDemo.class file is in c:\download.

The message indicates to me that it is not able to find the JFrame.setDefaultLookAndFeelDecorated(true) method. I think that the JFrame class is implemented in jre\lib\rt.jar (based upon a google search). However I am having problems looking in rt.jar. I think that I should be able to say jar -t rt.jar in order to see all of the classes that are implemented in the file. But when I do this the screen just hangs and I don't get any output.

I've tried adding c:\j2sdk1.4.2_7\jre\lib\rt.jar to my classpath, but this doesn't see to remedy the situation.

Here is the current output:

  
C:\download>set classpath=c:\j2sdk1.4.2_07\jre\lib\rt.jar;.
 
C:\download>java SimpleTableDemo
Exception occurred during event dispatching:
java.lang.NoSuchMethodError
        at SimpleTableDemo.createAndShowGUIrzc(SimpleTableDemo.java:80)
        at SimpleTableDemo.access$100(SimpleTableDemo.java:14)
        at SimpleTableDemo$2.run(SimpleTableDemo.java:101)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
 
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)
 

[ March 04, 2005: Message edited by: Robin Clark ]

[Robin Clark]

Well, finally I am able to get the simple program to run successfully. This is what my classpath looks like:

 
C:\download>set classpath
CLASSPATH=.;c:\junit3.8.1\junit.jar;c:\jakarta-log4j-1.2.8\dist\lib\log4j-1.2.8.
jar;c:\jwsdp-1.3\jaxp\lib\jaxp-api.jar;c:\apache-ant-1.6.0\lib\xercesImpl.jar;c:
\apache-ant-1.6.0\lib\xml-apis.jar;c:\j2sdk1.4.2_07\jre\lib\rt.jar
 

[Robin Clark]

In my older cmd.exe window I still couldn't get the program to execute. I determined what I needed to do to fix the problem was to change my path environment variable to put the c:\j2sdk1.4.2_07\bin at the very beginning of the path. I have NO idea why this fixed the problem. Can someone explain this to me?

Path after I moved c:\j2sdk1.4.2_07\bin to the beginning. Right after I did this the SimpleTableDemo program would execute successfully.

 
C:\download>set path
Path=c:\j2sdk1.4.2_07\bin;C:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.3.1\
bin;C:\Program Files\Oracle\jre\1.1.8\bin;C:\PROGRA~1\MKSTOO~1\bin;C:\PROGRA~1\M
KSTOO~1\bin\x11;C:\PROGRA~1\MKSTOO~1\mksnt;C:\Program Files\Microsoft.NET\Framew
orkSDK\Bin\;C:\Program Files\Microsoft Visual Studio .NET\Common7\IDE\;C:\WINNT\
Microsoft.NET\Framework\v1.0.3705\;C:\Program Files\Microsoft Visual Studio .NET
\Vc7\bin\;C:\WINNT\system32;C:\WINNT;C:\WINNT\system32\wbem;c:\dmi\win32\bin;"c:
\program files\hummingbird\connectivity\7.00\accessories\";"c:\program files\dis
kaccess\bin";C:\Program Files\doxygen\bin;C:\MSSQL7\BINN;C:\Program Files\Ration
al\common;c:\cvg\tools\rogue\7.1.1\lib;c:\cvg\tools\rogue\Edition_1\lib;c:\p2kia
m\instiam32\csrc\iamjnic\Debug;C:\Program Files\ATI Technologies\ATI Control Pan
el;c:\j2sdk1.4.2_07\bin;c:\apache-ant-1.6.0\bin
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH