Error when running mortgage calc program from DOS prompt

Question

I have a GUI Mortgage Calculator program. It probably isn't the most efficient use of code, but it gets the job done. I am running java SDK 1.6.0_06. This is a class assignment. We are to compile the code and post the .class file for our team members to run. I am trying to get the .class file to run after I compile it with javac. I used jCreator LE to create it... it compiles and runs there just fine. The program will compile at the DOS prompt, but will not run properly. The following is the error I get (any help would be appreciated):
Exception in thread "mani" java.lang.NoClassDefFoundError: manchorMortgage3
Caused by: java.lang.ClassNotFoundException: manchorMortgage3
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader1.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Below is my code:
* manchorMortgage3.java
* Created on July 10, 2008
* This program calculates and displays the mortgage amount
* from user input of the amount of the mortgage and the user's
* selection from a menu of available mortgage loans.
import java.math.*; //*loan calculator
import java.text.*; //*formats numbers
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class manchorMortgage3 extends javax.swing.JFrame {
    /** Creates new form manchorMortgage3 */
         public manchorMortgage3() {
         initComponents();
         setLocation(300,200);
    /** This method is called from within the constructor to
     * initialize the form.
    // Begin Initialize Components
    private void initComponents() {
        mortgageAmount = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        termAndInterest = new javax.swing.JLabel();
        jRadioButton1 = new javax.swing.JRadioButton();
        jRadioButton2 = new javax.swing.JRadioButton();
        jRadioButton3 = new javax.swing.JRadioButton();
        calcButton = new javax.swing.JButton();
        enterAmount = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        jButton2 = new javax.swing.JButton();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Manchor - Mortgage Calculator - Week 3");
        mortgageAmount.setText("Enter the Mortgage Amount:");
        termAndInterest.setText("Select Your Term and Interest Rate:");
        jRadioButton1.setText("7 years at 5.35%");
        jRadioButton1.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
        jRadioButton1.setMargin(new java.awt.Insets(0, 0, 0, 0));
        jRadioButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jRadioButton1ActionPerformed(evt);
        jRadioButton2.setText("15 years at 5.5%");
        jRadioButton2.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
        jRadioButton2.setMargin(new java.awt.Insets(0, 0, 0, 0));
        jRadioButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jRadioButton2ActionPerformed(evt);
        jRadioButton3.setText("30 years at 5.75%");
        jRadioButton3.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
        jRadioButton3.setMargin(new java.awt.Insets(0, 0, 0, 0));
        jRadioButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jRadioButton3ActionPerformed(evt);
        calcButton.setText("Calculate");
        calcButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                calcButtonActionPerformed(evt);
        jTextArea1.setColumns(20);
        jTextArea1.setEditable(false);
        jTextArea1.setRows(5);
        jScrollPane1.setViewportView(jTextArea1);
        jButton2.setText("Quit");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(26, 26, 26)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 324, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addContainerGap())
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                            .addComponent(enterAmount)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 222, Short.MAX_VALUE)
                            .addComponent(calcButton)
                            .addGap(75, 75, 75))
                        .addGroup(layout.createSequentialGroup()
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(jRadioButton3)
                                .addComponent(jRadioButton2)
                                .addComponent(jRadioButton1)
                                .addComponent(termAndInterest)
                                .addComponent(mortgageAmount)
                                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addContainerGap(224, Short.MAX_VALUE)))))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(277, Short.MAX_VALUE)
                .addComponent(jButton2)
                .addGap(70, 70, 70))
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(31, 31, 31)
                .addComponent(mortgageAmount)
                .addGap(14, 14, 14)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(20, 20, 20)
                .addComponent(termAndInterest)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jRadioButton1)
                .addGap(15, 15, 15)
                .addComponent(jRadioButton2)
                .addGap(19, 19, 19)
                .addComponent(jRadioButton3)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(calcButton)
                    .addComponent(enterAmount))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 112, Short.MAX_VALUE)
                .addGap(18, 18, 18)
                .addComponent(jButton2)
                .addGap(20, 20, 20))
        pack();
    }// End initialize components
    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//event_jButton2ActionPerformed
        System.exit(1);
    }//event_jButton2ActionPerformed
    static NumberFormat nf = NumberFormat.getCurrencyInstance(Locale.US);
    static NumberFormat np = NumberFormat.getPercentInstance();
    static NumberFormat ni = NumberFormat.getIntegerInstance();
    static BufferedReader br;
    private void calcButtonActionPerformed(java.awt.event.ActionEvent evt) {//event_calcButtonActionPerformed
        enterAmount.setText(null);
        jTextArea1.setText(null);
        double monthlyPayment;
        double interest;
        double amount ;       
        int years ;
        double monthlyInterest, monthlyPrinciple, principleBalance;
        int paymentsRemaining, lineCount;
        np.setMinimumFractionDigits(2);
    br = new BufferedReader(new InputStreamReader(System.in));
  lineCount = 0;
        try
                amount=Double.parseDouble(jTextField1.getText());
        catch (Exception e)
            enterAmount.setText("Please Enter Mortgage Amount");
            return;
        if(jRadioButton1.isSelected())
            interest=0.0535;
            years=7;
        else if(jRadioButton2.isSelected())
            interest=0.055;
            years=15;
        else if(jRadioButton3.isSelected())
            interest=0.0575;
            years=30;
        else
            enterAmount.setText("Please Select Your Term and Interest Rate");
            return;
    jTextArea1.append(" For a mortgage of " + nf.format(amount)+"\n"+" With a Term of " + ni.format(years) + " years"+"\n"+" And an Interest rate of " + np.format(interest)+"\n"+" The Payment Amount is " + nf.format(getMortgagePmt(amount, years, interest)) + " per month."+"\n"+"\n");
    principleBalance = amount - ((getMortgagePmt(amount, years, interest)) - (amount*(interest/12)));
    paymentsRemaining = 0;
    do
        monthlyInterest = principleBalance * (interest/12);//*Current monthly interest
         monthlyPrinciple = (getMortgagePmt(amount, years, interest)) - monthlyInterest;//*Principal payment each month minus interest
        paymentsRemaining = paymentsRemaining + 1;
        principleBalance = principleBalance - monthlyPrinciple;//*New balance of loan
        jTextArea1.append(" Principal on payment  " + ni.format(paymentsRemaining) + " is " + nf.format(monthlyPrinciple)+"\n");
                jTextArea1.append(" Interest on payment  " + ni.format(paymentsRemaining) + " is " + nf.format(monthlyInterest)+"\n");
                jTextArea1.append(" New loan balance on payment  " + ni.format(paymentsRemaining) + " is " + nf.format(principleBalance)+"\n"+"\n"+"\n");
     while (principleBalance > 1);
    }//Begin event_jRadioBtton1Action Performed
    public static double getMortgagePmt(double balance, double term, double rate)
            double monthlyRate = rate / 12;
            double monthlyPayment = (balance * monthlyRate)/(1-Math.pow(1+monthlyRate, - term * 12));
            return monthlyPayment;
    private void jRadioButton3ActionPerformed(java.awt.event.ActionEvent evt) {//Begin event_jRadioButton3ActionPerformed
         if(jRadioButton2.isSelected())
            jRadioButton2.setSelected(false);
         if(jRadioButton1.isSelected())
            jRadioButton1.setSelected(false);
    }//End event_jRadioButton3ActionPerformed
    private void jRadioButton2ActionPerformed(java.awt.event.ActionEvent evt) {//Begin event_jRadioButton2ActionPerformed
         if(jRadioButton1.isSelected())
            jRadioButton1.setSelected(false);
         if(jRadioButton3.isSelected())
            jRadioButton3.setSelected(false);
    }//End event_jRadioButton2ActionPerformed
    private void jRadioButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jRadioButton1ActionPerformed
        if(jRadioButton2.isSelected())
            jRadioButton2.setSelected(false);
        if(jRadioButton3.isSelected())
            jRadioButton3.setSelected(false);
    }//End event_jRadioButton1ActionPerformed
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new manchorMortgage3().setVisible(true);
    // Begin variables declaration
    private javax.swing.JButton calcButton;
    private javax.swing.JButton jButton2;
    private javax.swing.JLabel mortgageAmount;
    private javax.swing.JLabel termAndInterest;
    private javax.swing.JLabel enterAmount;
    private javax.swing.JRadioButton jRadioButton1;
    private javax.swing.JRadioButton jRadioButton2;
    private javax.swing.JRadioButton jRadioButton3;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JTextField jTextField1;
    // End  variables declaration
}

Answer 1

The class is not in your classpath. Likely you blew away your classpath with some silly environment variable.
If you are in the directory where your class file is then execute
java -cp . manchorMortgage3and it will work. (Note the -cp . which tells java to include the current directory in the runtime classpath)