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  1. #1
    Codeless is offline Member
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    Default How do I add this library?

    I need to make use of JNLP classes.

    import javax.jnlp.x (where x is the class I need) results in "import cannot be resolved".

    from this I gather the library is either not part of the java api or it is but not added to the build path by default for some reason.

    I was looking online for a jnlp.jar file but have been unable to find one.

    where can I find this jar file? and if I add it to the java build path associated with my project properties will my imports work as expected?

    thanks

  2. #2
    wsaryada is offline Senior Member
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    Default Re: How do I add this library?

    The JNLP libraries can be found in jre/lib/javaws.jar

  3. #3
    Codeless is offline Member
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    Default Re: How do I add this library?

    thanks a million I found it. but there seems to be another problem with using the library perhaps you can help.

    my example from a textbook doesn't appear to work.

    Java Code:
    package pkg;
    
    // Fig. 21.1: LoadImageAndScale.java
    // Loading, displaying and scaling an image in an applet
    import java.awt.BorderLayout;
    import java.awt.Graphics;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import javax.jnlp.FileContents;
    import javax.jnlp.FileOpenService;
    import javax.jnlp.ServiceManager;
    import javax.swing.ImageIcon;
    import javax.swing.JApplet;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JOptionPane;
    import javax.swing.JPanel;
    import javax.swing.JTextField;
    
    public class LoadImageAndScale extends JApplet 
    {   
       private ImageIcon image; // references image to display
       private JPanel scaleJPanel; // JPanel containing the scale-selector
       private JLabel percentJLabel; // label for JTextField
       private JTextField scaleInputJTextField; // obtains userís input
       private JButton scaleChangeJButton; // initiates scaling of image
       private double scaleValue = 1.0;  //scale percentage for image
    
       // load image when applet is loaded
       public void init()
       {
          scaleJPanel = new JPanel();
          percentJLabel = new JLabel( "scale percent:" );
          scaleInputJTextField = new JTextField( "100" );
          scaleChangeJButton = new JButton( "Set Scale" );
    
          // add components and place scaleJPanel in applet's NORTH region
          scaleJPanel.add( percentJLabel ); 
          scaleJPanel.add( scaleInputJTextField );
          scaleJPanel.add( scaleChangeJButton );
          add( scaleJPanel, BorderLayout.NORTH );
    
          // register event handler for scaleChangeJButton
          scaleChangeJButton.addActionListener(
             new ActionListener()
             {
                // when the JButton is pressed, set scaleValue and repaint
                public void actionPerformed( ActionEvent e ) 
                {
                   scaleValue = Double.parseDouble( 
                      scaleInputJTextField.getText() ) / 100.0;
                   repaint(); // causes image to be redisplyed at new scale
                } // end method actionPerformed
             } // end anonymous inner class
          ); // end call to addActionListener
    
          // use JNLP services to open an image file that the user selects
          try
          {
             // get a reference to the FileOpenService
             FileOpenService fileOpenService = 
                (FileOpenService) ServiceManager.lookup( 
                   "javax.jnlp.FileOpenService" );
    
             // get file's contents from the FileOpenService
             FileContents contents = 
                fileOpenService.openFileDialog( null, null );
    
             // byte array to store image's data
             byte[] imageData = new byte[ (int) contents.getLength() ];
             contents.getInputStream().read( imageData ); // read image bytes
             image = new ImageIcon( imageData ); // create the image
    
             // if image successfully loaded, create and add DrawJPanel
             add( new DrawJPanel(), BorderLayout.CENTER );
          } // end try
          catch( Exception e )
          {
             e.printStackTrace();
          } // end catch
       } // end method init
    
       // DrawJPanel used to display loaded image
       private class DrawJPanel extends JPanel
       {
          // display image
          public void paintComponent( Graphics g )
          {
             super.paintComponent( g );
    
             // the following values are used to center the image
             double spareWidth = 
                getWidth() - scaleValue * image.getIconWidth();
             double spareHeight = 
                getHeight() - scaleValue * image.getIconHeight();
    
             // draw image with scaled width and height
             g.drawImage( image.getImage(), 
                (int) ( spareWidth ) / 2, (int) ( spareHeight ) / 2,
                (int) ( image.getIconWidth() * scaleValue ),
                (int) ( image.getIconHeight() * scaleValue ), this );
          } // end method paint
       } // end class DrawJPanel
    } // end class LoadImageAndScale
    the stack trace is

    Java Code:
    javax.jnlp.UnavailableServiceException: uninitialized
    	at javax.jnlp.ServiceManager.lookup(Unknown Source)
    	at pkg.LoadImageAndScale.init(LoadImageAndScale.java:63)
    	at sun.applet.AppletPanel.run(Unknown Source)
    	at java.lang.Thread.run(Unknown Source)
    What is this UnavailableServiceException class and why is it uninitialized?

  4. #4
    mixolydian807 is offline Member
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    Default Re: How do I add this library?

    I don't mean to dig up an old thread, but it seems that I am getting this issue as well, on this exact exercise, we read from the same book. Did you ever get this resolved?

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