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Thread: Run Time Error!!!

  1. #1
    Junior Member
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    Angry Run Time Error!!!

    package Employee;
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.SQLException;
    import java.sql.Statement;
    import java.sql.ResultSet;
    import javax.swing.JOptionPane;

    public class newemp extends javax.swing.JFrame {

    Connection con;
    Statement stmt;
    ResultSet rs;


    public newemp() {
    initComponents();
    DoConnect();
    }

    public void DoConnect()
    {
    try
    {
    String host = "jdbc:derby://localhost:1527/employe";
    String uName = "selvan";
    String uPass = "selvan";
    Connection con = DriverManager.getConnection( host, uName, uPass );

    }
    catch ( SQLException err )
    {
    JOptionPane.showMessageDialog(null, err.getMessage());
    }

    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

    jLabel1 = new javax.swing.JLabel();
    jLabel2 = new javax.swing.JLabel();
    jLabel3 = new javax.swing.JLabel();
    jLabel4 = new javax.swing.JLabel();
    empname = new javax.swing.JTextField();
    empid = new javax.swing.JTextField();
    salary = new javax.swing.JTextField();
    occupation = new javax.swing.JTextField();
    add = new javax.swing.JButton();
    jButton1 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);

    jLabel1.setText("Employee Name");

    jLabel2.setText("Employee ID");

    jLabel3.setText("Salary");

    jLabel4.setText("Occupation");

    salary.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    salaryActionPerformed(evt);
    }
    });

    add.setText("ADD");
    add.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    addActionPerformed(evt);
    }
    });

    jButton1.setText("<< Back");

    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(50, 50, 50)
    .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
    .addComponent(jLabel1)
    .addComponent(jLabel2)
    .addComponent(jLabel3)
    .addComponent(jLabel4))
    .addGap(100, 100, 100)
    .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING, false)
    .addComponent(empname)
    .addComponent(empid)
    .addComponent(salary)
    .addComponent(occupation, javax.swing.GroupLayout.DEFAULT_SIZE, 120, Short.MAX_VALUE))
    .addGap(136, 136, 136)
    .addComponent(add)
    .addContainerGap(208, Short.MAX_VALUE))
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILI NG, layout.createSequentialGroup()
    .addContainerGap(javax.swing.GroupLayout.DEFAULT_S IZE, Short.MAX_VALUE)
    .addComponent(jButton1)
    .addGap(24, 24, 24))
    );
    layout.setVerticalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
    .addGroup(layout.createSequentialGroup()
    .addGap(56, 56, 56)
    .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
    .addComponent(jLabel1)
    .addComponent(empname, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
    .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.LEADING)
    .addGroup(layout.createSequentialGroup()
    .addGap(28, 28, 28)
    .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
    .addComponent(jLabel2)
    .addComponent(empid, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
    .addGroup(layout.createSequentialGroup()
    .addGap(43, 43, 43)
    .addComponent(add)))
    .addGap(13, 13, 13)
    .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
    .addComponent(jLabel3)
    .addComponent(salary, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
    .addGap(45, 45, 45)
    .addGroup(layout.createParallelGroup(javax.swing.G roupLayout.Alignment.BASELINE)
    .addComponent(jLabel4)
    .addComponent(occupation, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
    .addPreferredGap(javax.swing.LayoutStyle.Component Placement.RELATED, 100, Short.MAX_VALUE)
    .addComponent(jButton1)
    .addGap(40, 40, 40))
    );

    pack();
    }// </editor-fold>

    private void salaryActionPerformed(java.awt.event.ActionEvent evt) {

    }


    private void addActionPerformed(java.awt.event.ActionEvent evt) {

    try
    {
    stmt = con.createStatement();
    String sql = "INSERT INTO SELVAN.WORKERS VALUES ('" +empid.getText()+ "' and '" + empname.getText()+ "' and '" + salary.getText() + "')";
    rs = stmt.executeQuery(sql);
    String msg;
    msg = " "+ empname.getText() + " are added to our company.The emp ID is" + empid.getText();
    empid.setText("");
    empname.setText("");
    salary.setText("");
    JOptionPane.showMessageDialog(null,msg);

    }

    catch (SQLException err)
    {
    JOptionPane.showMessageDialog(null, err.getMessage());
    }

    }


    public static void main(String args[]) {

    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
    * For details see How to Set the Look and Feel (The Java™ Tutorials > Creating a GUI With JFC/Swing > Modifying the Look and Feel)
    */
    try {
    for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
    if ("Nimbus".equals(info.getName())) {
    javax.swing.UIManager.setLookAndFeel(info.getClass Name());
    break;
    }
    }
    } catch (ClassNotFoundException ex) {
    java.util.logging.Logger.getLogger(newemp.class.ge tName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
    java.util.logging.Logger.getLogger(newemp.class.ge tName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
    java.util.logging.Logger.getLogger(newemp.class.ge tName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
    java.util.logging.Logger.getLogger(newemp.class.ge tName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>


    java.awt.EventQueue.invokeLater(new Runnable() {
    public void run() {
    new newemp().setVisible(true);
    }
    });
    }
    // Variables declaration - do not modify
    private javax.swing.JButton add;
    private javax.swing.JTextField empid;
    private javax.swing.JTextField empname;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JTextField occupation;
    private javax.swing.JTextField salary;
    // End of variables declaration
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Run Time Error!!!

    Please copy the full text of the error message and paste it here.

    Please edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Junior Member
    Join Date
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    Posts
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    Default Re: Run Time Error!!!

    K
    Quote Originally Posted by Norm View Post
    Please copy the full text of the error message and paste it here.

    Please edit your post and wrap your code with
    [code=java]
    run:
    Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at Employee.newemp.addActionPerformed(newemp.java:144 )
    at Employee.newemp.access$100(newemp.java:10)
    at Employee.newemp$2.actionPerformed(newemp.java:72)
    at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.jav a:6505)
    at javax.swing.JComponent.processMouseEvent(JComponen t.java:3321)
    at java.awt.Component.processEvent(Component.java:627 0)
    at java.awt.Container.processEvent(Container.java:222 9)
    at java.awt.Component.dispatchEventImpl(Component.jav a:4861)
    at java.awt.Container.dispatchEventImpl(Container.jav a:2287)
    at java.awt.Component.dispatchEvent(Component.java:46 87)
    at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.jav a:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2719 )
    at java.awt.Component.dispatchEvent(Component.java:46 87)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.j ava:723)
    at java.awt.EventQueue.access$200(EventQueue.java:103 )
    at java.awt.EventQueue$3.run(EventQueue.java:682)
    at java.awt.EventQueue$3.run(EventQueue.java:680)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPri vilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPri vilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:696)
    at java.awt.EventQueue$4.run(EventQueue.java:694)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPri vilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java: 693)
    at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:91)
    BUILD SUCCESSFUL (total time: 10 seconds)

    [/code]
    to get highlighting and preserve formatting.

  4. #4
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Location
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    Default Re: Run Time Error!!!

    Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at Employee.newemp.addActionPerformed(newemp.java:144 )
    There is a variable with a null value when the code at line 144 is executed. Look at line 144, find the variable with the null value and then backtrack in the code to see why that variable does not have a valid non-null value. Use a println to print out the variables on line 144 if you can not see which variable has the null value.


    Please edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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