🚀 go-pugleaf

Hi,

  I employed the new Swing release: 1.0.3 or 1.1beta in
applet development.

  But, whenever GridControl is used, the applet keeps
throwing exceptions, which is fine in using with swing1.0.1.

  I am wondering if anybody has solutions or explanations
to this problem. The exceptions and code are attached.

  Thanks in advance.

					Yan Zhou
					yzhou@mtu.edu


Netscape Communications Corporation -- Java 1.1.5

Type '?' for options.

Symantec Java! ByteCode Compiler Version 210.065
Copyright (C) 1996-97 Symantec Corporation
# Applet exception: exception: java.lang.NullPointerException

java.lang.NullPointerException

  at borland.jbcl.view.GridView.addFocusListener(Compiled Code)

  at com.sun.java.swing.JComponent.enableSerialization(Compiled Code)

  at com.sun.java.swing.JComponent.<init>(Compiled Code)

  at com.sun.java.swing.JScrollPane.<init>(Compiled Code)

  at com.sun.java.swing.JScrollPane.<init>(Compiled Code)

  at borland.jbcl.view.GridView.<init>(Compiled Code)

* at borland.jbcl.control.GridControl.<init>(Compiled Code)

  at testGrid.Applet1.<init>(Compiled Code)

  at
netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled
Code)

  at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
Code)

  at java.awt.EventDispatchThread.run(Compiled Code)

  at
netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
Code)

# Applet exception: exception: java.lang.NullPointerException

java.lang.NullPointerException

  at borland.jbcl.view.GridView.addFocusListener(Compiled Code)

  at com.sun.java.swing.JComponent.enableSerialization(Compiled Code)

  at com.sun.java.swing.JComponent.<init>(Compiled Code)

  at com.sun.java.swing.JScrollPane.<init>(Compiled Code)

  at com.sun.java.swing.JScrollPane.<init>(Compiled Code)

  at borland.jbcl.view.GridView.<init>(Compiled Code)

* at borland.jbcl.control.GridControl.<init>(Compiled Code)

  at testGrid.Applet1.<init>(Compiled Code)

  at
netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled
Code)

  at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
Code)

  at java.awt.EventDispatchThread.run(Compiled Code)

  at
netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
Code)



The following code does nothing but add a grid into applet.
It works fine with swing 1.0.1, but not with swing 1.0.3 or
swing 1.1beta.


import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;
import borland.jbcl.layout.*;
import borland.jbcl.control.*;

//import com.sun.java.swing.UIManager;
public class Applet1 extends JApplet {
  boolean isStandalone = false;
  BorderLayout borderLayout1 = new BorderLayout();
  BevelPanel bevelPanel1 = new BevelPanel();
  GridControl gridControl1 = new GridControl();
  BorderLayout borderLayout2 = new BorderLayout();
//Get a parameter value

  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  //Construct the applet
  
  public Applet1() {
  }
//Initialize the applet
  
  public void init() {
    try {
    jbInit();
    }
    catch (Exception e) {
    e.printStackTrace();
    }
  }
  //static { 
  //  try { 
  //    //UIManager.setLookAndFeel(new
com.sun.java.swing.plaf.metal.MetalLookAndFeel());
  //    //UIManager.setLookAndFeel(new
com.sun.java.swing.plaf.motif.MotifLookAndFeel());
  //    UIManager.setLookAndFeel(new
com.sun.java.swing.plaf.windows.WindowsLookAndFeel());
  //  }
  //  catch (Exception e) {}
  //}
//Component initialization

  private void jbInit() throws Exception {
    this.getContentPane().setLayout(borderLayout1);
    bevelPanel1.setLayout(borderLayout2);
    gridControl1.addFocusListener(new java.awt.event.FocusAdapter() {
      public void focusGained(FocusEvent e) {
        gridControl1_focusGained(e);
      }
    });
    gridControl1.addKeyListener(new java.awt.event.KeyAdapter() {
      public void keyPressed(KeyEvent e) {
        gridControl1_keyPressed(e);
      }
    });
    gridControl1.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        gridControl1_mouseClicked(e);
      }
    });
    this.getContentPane().add(bevelPanel1, BorderLayout.CENTER);
    bevelPanel1.add(gridControl1, BorderLayout.CENTER);
  }
//Get Applet information
  
  public String getAppletInfo() {
    return "Applet Information";
  }
//Get parameter info
  
  public String[][] getParameterInfo() {
    return null;
  }

  void gridControl1_focusGained(FocusEvent e) {

  }

  void gridControl1_keyPressed(KeyEvent e) {

  }

  void gridControl1_mouseClicked(MouseEvent e) {

  }
}