Hi all,

I have compiled my Applet code and get no errors. When I try to run it in the browser I get grey box and in the bottom it says.

Applet Started

But does not load anythink, I have been to the java console and this is what it says:

java.lang.reflect.InvocationTargetException
	at java.awt.EventQueue.invokeAndWait(Unknown Source)
	at PcPerformance2.init(PcPerformance2.java:15)
	at sun.applet.AppletPanel.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
	at javax.swing.ImageIcon.<init>(Unknown Source)
	at PcPerformance2.initComponents(PcPerformance2.java:69)
	at PcPerformance2.access$000(PcPerformance2.java:9)
	at PcPerformance2$1.run(PcPerformance2.java:17)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

any help or advice be good thanks as really driving me nuts

Looks like you're getting a nullpointer exception. I think the problem lies in the PcPerformance2.java class. Can you post your code?

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 *
 * @author  Jamie66
 */
public class PcPerformance2 extends JApplet {
    
    //This run the into method what calls the initcomponents this
    //is where all the layout and button and layers are keep to be set up.
    public void init() {
        try {
            java.awt.EventQueue.invokeAndWait(new Runnable() {
               public void run() {
                    initComponents();
                }
            });
        } catch (Exception ex) {
          ex.printStackTrace();
       }
    }
    
    //This is the initcomponents this builds the gui
    //it put the button on the screen the jpanle the lables everythink you see
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        lbPcAmount = new javax.swing.JLabel();
        txtAmount = new javax.swing.JTextField();
        lbPc1Year = new javax.swing.JLabel();
        lbPcDay = new javax.swing.JLabel();
        lbCopyWrite = new javax.swing.JLabel();
        btnCal = new javax.swing.JButton();
        btnReset = new javax.swing.JButton();
        lbLogo = new javax.swing.JLabel();
        txtYear = new javax.swing.JLabel();
        txtDay = new javax.swing.JLabel();

        setLayout(new java.awt.BorderLayout());

        jPanel1.setBackground(new java.awt.Color(199, 198, 254));

        lbPcAmount.setText("Enter Performance Amount £");

        txtAmount.setText("0");

        lbPc1Year.setText("Total PcPerformance");

        lbPcDay.setText("Cost of PcPerformance per day");

        lbCopyWrite.setText("© Copywrite 2008");

        btnCal.setText("Calculate");
        btnCal.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnCalActionPerformed(evt);
            }
        });

        btnReset.setText("Reset");
        btnReset.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnResetActionPerformed(evt);
            }
        });

        lbLogo.setIcon(new javax.swing.ImageIcon(getClass().getResource("/PcPerformance/pc.jpg"))); 

        txtYear.setText("0");

        txtDay.setText("0");

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(29, 29, 29)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(lbPcAmount)
                            .addComponent(lbPc1Year)
                            .addComponent(lbPcDay))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(txtAmount, javax.swing.GroupLayout.DEFAULT_SIZE, 72, Short.MAX_VALUE)
                            .addComponent(txtYear, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(txtDay, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(45, 45, 45)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(lbCopyWrite)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(btnCal)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(btnReset)))))
                .addContainerGap(45, Short.MAX_VALUE))
            .addComponent(lbLogo, javax.swing.GroupLayout.DEFAULT_SIZE, 302, Short.MAX_VALUE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addComponent(lbLogo, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 78, Short.MAX_VALUE)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(lbPcAmount)
                    .addComponent(txtAmount, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(lbPc1Year)
                    .addComponent(txtYear))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(lbPcDay)
                    .addComponent(txtDay))
                .addGap(35, 35, 35)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(btnCal)
                    .addComponent(btnReset))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(lbCopyWrite)
                .addContainerGap())
        );

        lbPc1Year.getAccessibleContext().setAccessibleName("Total PcPerformance");

        add(jPanel1, java.awt.BorderLayout.CENTER);
    }

private void btnCalActionPerformed(java.awt.event.ActionEvent evt) {                                       
// this is the actionlisten for the calculation button 
    
  double x;
  String total;
  String newtotal;
  
  //This converts the string to a double.
      try {
      String xStr = txtAmount.getText();
      x = Double.parseDouble(xStr);
   }
      //This gives an error if the user inputs a letter 
   catch (NumberFormatException e) {
          // The string xStr is not a legal number.
      txtAmount.setText("Illegal data");
      return;
   }
      //value = getParameter("length"); // Get message param, if any. to get value
     //currentLength = value;
    // value = getParameter("length");
    //   currentLength = Integer.parseInt(value);  // Convert string to number.
  
      //This is where the calculation takes place 
      total = ( "£" + (x*12));
      txtYear.setText(total);
      newtotal =(((x*12)/365) +"p");
      txtDay.setText(newtotal);
         
}                                      

private void btnResetActionPerformed(java.awt.event.ActionEvent evt) {                                         
// This is the second actionlisten that reset the fields once the button is clicked
    txtAmount.setText("0");
    txtYear.setText("0");
    txtDay.setText("0");
}                                        
 
    // Variables declaration - do not modify
    private javax.swing.JButton btnCal;
    private javax.swing.JButton btnReset;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JLabel lbCopyWrite;
    private javax.swing.JLabel lbLogo;
    private javax.swing.JLabel lbPc1Year;
    private javax.swing.JLabel lbPcAmount;
    private javax.swing.JLabel lbPcDay;
    private javax.swing.JTextField txtAmount;
    private javax.swing.JLabel txtDay;
    private javax.swing.JLabel txtYear;
    // End of variables declaration
    
}

there we go

Originally Posted by NullPointer

Looks like you're getting a nullpointer exception.

Figures you would say that!