applet won't run on all platforms

Another thing - I tried these at home last night, also XP Pro, J2SDK 1.4.2_06, and they ran fine. So I replaced JDK 1.4.1 with 1.4.2_06 this morning, and it still doesn't run, although the error message is different.

java.lang.StackOverflowError

java.lang.NullPointerException

at sun.applet.AppletViewer.appletInfo(AppletViewer.java:696)

at sun.applet.AppletViewer.processUserAction(AppletViewer.java:906)

at sun.applet.AppletViewer$UserActionListener.actionPerformed(AppletView

er.java:133)

at java.awt.MenuItem.processActionEvent(MenuItem.java:589)

at java.awt.MenuItem.processEvent(MenuItem.java:548)

at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:285)

at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:273)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:458)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh

read.java:201)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre

ad.java:151)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

hboswell at 2007-7-7 1:09:30 >

OK, here's the code:

//CardDemo.java

// action handling with multiple events

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

public class CardDemo extends Applet implements ActionListener{

//Control panel components

Panel pnlControls = new Panel();

Button btnFirst = new Button("|<<");

Button btnPrev = new Button("<==");

Button btnC = new Button("C");

Button btnNext = new Button("==>");

Button btnLast = new Button(">>|");

//The Cards

Panel pnlCards = new Panel();

CardLayout Stack = new CardLayout();

Label lblA = new Label("A");

Label lblB = new Label("B");

Label lblC = new Label("C");

Label lblD = new Label("D");

Label lblE = new Label("E");

public void init(){

//set up the main page

this.setLayout(new BorderLayout());

this.add(pnlControls, BorderLayout.SOUTH);

this.add(pnlCards, BorderLayout.CENTER);

// set up the control panel

pnlControls.setFont(new Font("SanSerif",Font.BOLD, 20));

pnlControls.setLayout(new FlowLayout());

pnlControls.add(btnFirst);

pnlControls.add(btnPrev);

pnlControls.add(btnC);

pnlControls.add(btnNext);

pnlControls.add(btnLast);

// register the ActionListener

btnFirst.addActionListener(this);

btnPrev.addActionListener(this);

btnC.addActionListener(this);

btnNext.addActionListener(this);

btnLast.addActionListener(this);

//set up the card panel

pnlCards.setLayout(Stack);

pnlCards.setFont(new Font("SanSerif",Font.BOLD, 60));

pnlCards.add(lblA,"A");

pnlCards.add(lblB,"B");

pnlCards.add(lblC,"C");

pnlCards.add(lblD,"D");

pnlCards.add(lblE,"E");

//center the labels

lblA.setAlignment(Label.CENTER);

lblB.setAlignment(Label.CENTER);

lblC.setAlignment(Label.CENTER);

lblD.setAlignment(Label.CENTER);

lblE.setAlignment(Label.CENTER);

} // end init

public void actionPerformed(ActionEvent e){

//get the name of the button that was pressed

String theCommand = e.getActionCommand();

//check to see which button was pressed

if (theCommand.equals("|<<")){

Stack.first(pnlCards);

}

else if (theCommand.equals("<==")){

Stack.previous(pnlCards);

}

else if (theCommand.equals("C")){

Stack.show(pnlCards,"C");

}

else if (theCommand.equals("==>")){

Stack.next(pnlCards);

}

else if (theCommand.equals(">>|")){

Stack.last(pnlCards);

} // end if

} // end ActionPerformed

} // end class def

hboswell at 2007-7-7 1:09:30 >