Thread: Music player problem

Hi I made a small music player. But when I select the file the windows does not turn up but the music plays in the background and I get these exceptions

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at Musique.openFile(Musique.java:72)
at Musique.init(Musique.java:37)
at TaskPanel.actionPerformed(TaskPanel.java:43)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.jav a:6134)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3265)
at java.awt.Component.processEvent(Component.java:589 9)
at java.awt.Container.processEvent(Container.java:202 3)
at java.awt.Component.dispatchEventImpl(Component.jav a:4501)
at java.awt.Container.dispatchEventImpl(Container.jav a:2081)
at java.awt.Component.dispatchEvent(Component.java:43 31)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4299)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:3963)
at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:3893)
at java.awt.Container.dispatchEventImpl(Container.jav a:2067)
at java.awt.Window.dispatchEventImpl(Window.java:2458 )
at java.awt.Component.dispatchEvent(Component.java:43 31)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 599)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:284)
at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:122)

import java.io.*;
import java.io.FileInputStream.*;
import java.awt.*;
import javax.swing.JInternalFrame;
import javax.swing.UIManager.*;
import javax.swing.event.InternalFrameEvent;
import javax.media.*;
import com.sun.media.ui.*;
import java.net.*;
import javax.swing.event.InternalFrameAdapter;
 
class Musique implements ControllerListener
{ String filename;
    FileDialog fd;
    public void init()
    { core c = new core();
        if (fd == null) 
                        {
                            fd = new FileDialog(c,"Open File",
						       FileDialog.LOAD);
                        	fd.setDirectory("/movies");
                        }
                        fd.show();
                            if (fd.getFile() != null) {
                            String filename = fd.getDirectory() + fd.getFile();
                            openFile("file:" + filename);
		    }
 
 
    }           
public void openFile(String filename) {
    //writepadstart w = new writepadstart();
 
	String mediaFile = filename;
	Player player = null;
	// URL for our media file
	URL url = null;
	try {
	    // Create an url from the file name and the url to the
	    // document containing this applet.
	    if ((url = new URL(mediaFile)) == null) {
		Fatal("Can't build URL for " + mediaFile);
		return;
	    }
 
	    // Create an instance of a player for this media
	    try {
		player = Manager.createPlayer(url);
	    } catch (NoPlayerException e) {
		Fatal("Error: " + e);
	    }
	} catch (MalformedURLException e) {
	    Fatal("Error:" + e);
	} catch (IOException e) {
	    Fatal("Error:" + e);
	}
	if (player != null) {
            core c = new core();
	    this.filename = filename;
	    JMFrame1 jmframe = new JMFrame1(player, filename);
	    c.cont.add(jmframe);
            jmframe.moveToFront();
            jmframe.setClosable(true);
            jmframe.setMaximizable(true);
            jmframe.setIconifiable(true);
            jmframe.setResizable(true);
            jmframe.show();
 
	}
    }
 
    static void Fatal(String s) {
	MessageBox mb = new MessageBox("JMF Error", s);
    }    
 
    public void controllerUpdate(ControllerEvent arg0) {
        throw new UnsupportedOperationException("Not supported yet.");
    }
 
}
 
 
class JMFrame1 extends JInternalFrame implements ControllerListener {
    Player mplayer;
    Component visual = null;
    Component control = null;
    int videoWidth = 0;
    int videoHeight = 0;
    int controlHeight = 30;
    int insetWidth = 10;
    int insetHeight = 30;
    boolean firstTime = true;
 
    JMFrame1(Player player, String title) {
 
	getContentPane().setLayout( new BorderLayout() );
	setSize(320, 10);
	setLocation(50, 50);
	setVisible(true);
	mplayer = player;
	mplayer.addControllerListener((ControllerListener) this);
	mplayer.realize();
	addInternalFrameListener( new InternalFrameAdapter() {
            @Override
	    public void internalFrameClosing(InternalFrameEvent ife) {
		mplayer.close();
	    }
	} );
    }
 
 
 
 
 
 
 
 
 
    public void controllerUpdate(ControllerEvent ce) {
	if (ce instanceof RealizeCompleteEvent) {
	    mplayer.prefetch();
	} else if (ce instanceof PrefetchCompleteEvent) {
	    if (visual != null)
		return;
 
	    if ((visual = mplayer.getVisualComponent()) != null) {
		Dimension size = visual.getPreferredSize();
		videoWidth = size.width;
		videoHeight = size.height;
		getContentPane().add("Center", visual);
	    } else
		videoWidth = 320;
	    if ((control = mplayer.getControlPanelComponent()) != null) {
		controlHeight = control.getPreferredSize().height;
		getContentPane().add("South", control);
	    }
	    setSize(videoWidth + insetWidth,
		    videoHeight + controlHeight + insetHeight);
	    validate();
	    mplayer.start();
	} else if (ce instanceof EndOfMediaEvent) {
	    mplayer.setMediaTime(new Time(0));
	    mplayer.start();
	}
    }
}

Hi What is core in there?

I am unable to resolve it.

Is it some extra class have designed.

Then send its code.

/* Codename 'Puma' (I like cats and dogs)
 * Build Core 2 Build 1
 * Build 1 Date: 26/01/2010
 * 
 * A Java Based Desktop Environment For Windows, Macintosh and Linux.
 * Created by Abhinav Sunil Hardikar.
 * 
 * About me:
 * I am 17 year old guy in the 11 grade. Studying Java from a book I have successfully 
 * made Core 1 Build 1 to 8. Just search for "Java Based desktop environment" on google
 * and select the ubuntuforums link for more information.
 * 
 * [LOG]
 * Scrapped Core 1 Build 8 architecture
 * New Core architecture design implemented.
 * 
 */
 
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.UIManager.LookAndFeelInfo;
import java.io.*;
import java.io.FileInputStream.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JInternalFrame;
import javax.swing.UIManager.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.InternalFrameEvent;
import javax.swing.event.InternalFrameListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
import javax.media.*;
import com.sun.media.ui.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import java.util.Vector;
import java.net.*;
import javax.swing.event.InternalFrameAdapter;
 
 
class core extends JFrame
{
    // DECLARATIONS
 
        JMenu menu;
        JMenuBar menubar;
        JMenuItem menuitem;
        JDesktopPane dpane;
        Container cont;
        JLabel wallpaper;
    // END OF DECLARATIONS
    public void init()
    {      
        // INITIALIZATIONS
         Manager.setHint(Manager.LIGHTWEIGHT_RENDERER, new Boolean(true));
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        TaskPanel tsk = new TaskPanel();
        menu = new JMenu("File");
        menubar = new JMenuBar();
        dpane = new JDesktopPane();
        cont = getContentPane();
        ImageIcon im = new ImageIcon("c:\\wallpaper\\puma3.jpg");
        Image img = im.getImage();
        Image wall = img.getScaledInstance(screenSize.width, screenSize.height,  java.awt.Image.SCALE_SMOOTH);  
        ImageIcon newWall = new ImageIcon(wall); 
        wallpaper = new JLabel(newWall, JLabel.CENTER);
        //wallpaper.moveToBack();
 
        //END OF INITIALIZATIONS
 
 
        //dpane.add(n.jmframe);
        //cont.add(n);
        menubar.add(menu);
        menu.add(new JMenuItem("Menu"));
        cont.add(menubar, BorderLayout.NORTH);
        tsk.content();
        cont.add(tsk, BorderLayout.SOUTH);
 
        wallpaper.setSize(getSize());
        cont.add(wallpaper);
 
        cont.add(dpane);
        /*JMFrame1 n = new JMFrame1();
        n.init();*/
    }
}
class Puma
{
    public static void main(String args[])
    {   
        try
        {   Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
            UIManager.setLookAndFeel("com.seaglasslookandfeel.SeaGlassLookAndFeel");
            /*for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels())
                     {
                         if ("Nimbus".equals(info.getName())) 
                         {
                                   UIManager.setLookAndFeel(info.getClassName());
 
                                   break;
                         }
                     }*/
 
 
 
 
            core c = new core();
 
            c.setTitle("Puma");
            c.setSize(screenSize);
            c.setExtendedState(JFrame.MAXIMIZED_BOTH);
            c.addWindowListener(new WindowAdapter() {@Override
                    public void windowClosing(WindowEvent e) {System.exit(0);}});
            c.setUndecorated(true);
            c.init();
            c.show();
        }
 
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}

Hi, There is one more error appearing saying that

TaskPanel can not be resolved.

sorry forgot to ive you the TaskPanel class code

import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.io.FileInputStream.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JInternalFrame;
import javax.swing.UIManager.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.InternalFrameEvent;
import javax.swing.event.InternalFrameListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
import javax.media.*;
import com.sun.media.ui.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import java.util.Vector;
import java.net.*;
import javax.swing.event.InternalFrameAdapter;
 
 
public class TaskPanel extends JToolBar implements ActionListener
{   
    JButton m;
    public void content() throws UnsupportedLookAndFeelException, ClassNotFoundException, InstantiationException, IllegalAccessException
    {
        UIManager.setLookAndFeel("com.seaglasslookandfeel.SeaGlassLookAndFeel");
        m = new JButton("Musique");
      //m.setSize(10, 10);
      m.addActionListener(this);
        add(m);
 
 
    }
    public void actionPerformed(ActionEvent event)
        {try{
 
        if(event.getSource() == m)
        {
        Musique n = new Musique();
        n.init();
 
        core c = new core();
 
        }
    }
         catch(Exception e)
         {
            e.printStackTrace();
         }
    }
}

Hi Now I am getting one more error on this particular line

UIManager.setLookAndFeel("com.seaglasslookandfeel. SeaGlassLookAndFeel");

The error is:
java.lang.ClassNotFoundException: com.seaglasslookandfeel.SeaGlassLookAndFeel

 UIManager.setLookAndFeel("com.seaglasslookandfeel.SeaGlassLookAndFeel");
            /*for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels())
                     {
                         if ("Nimbus".equals(info.getName())) 
                         {
                                   UIManager.setLookAndFeel(info.getClassName());
 
                                   break;
                         }
                     }*/

If you can see this part of the program just chage it to

// UIManager.setLookAndFeel("com.seaglasslookandfeel.SeaGlassLookAndFeel");
            for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels())
                     {
                         if ("Nimbus".equals(info.getName())) 
                         {
                                   UIManager.setLookAndFeel(info.getClassName());
 
                                   break;
                         }
                     }

It will work
Sorry for troubling you so much