title: JDBC ODBC.. (Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException)
body: <pre><code>private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    PreparedStatement p1;
     try {
         System.out.println("works");
         String s1="insert into reg(num,name) values(?,?)";
        p1 = conn.prepareStatement(s1);
        System.out.println("Works");
        JOptionPane.showMessageDialog(this, "Statement prepared");
  
     p1.setString(1,num.getText());
     p1.setString(2, name.getText());
     p1.executeUpdate();
     JOptionPane.showMessageDialog(this, "Inserted");
      }
   catch (SQLException ex) {
   JOptionPane.showMessageDialog(this, "NOT Inserted");
          Logger.getLogger(sample.class.getName()).log(Level.SEVERE, null, ex);
      }
  
      // TODO add your handling code here:
  }                                        
  </code></pre>
  
  <p><strong>This is my insert module.. This works in my friend's laptop. But not in mine :(
  I get the following error:</strong></p>
  
  <p>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
          at sample.jButton1ActionPerformed(sample.java:197)
          at sample.access$200(sample.java:20)
          at sample$3.actionPerformed(sample.java:92)
          at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
          at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
          at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
          at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
          at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
          at java.awt.Component.processMouseEvent(Component.java:6263)
          at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
          at java.awt.Component.processEvent(Component.java:6028)
          at java.awt.Container.processEvent(Container.java:2041)
          at java.awt.Component.dispatchEventImpl(Component.java:4630)
          at java.awt.Container.dispatchEventImpl(Container.java:2099)
          at java.awt.Component.dispatchEvent(Component.java:4460)
          at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
          at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
          at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
          at java.awt.Container.dispatchEventImpl(Container.java:2085)
          at java.awt.Window.dispatchEventImpl(Window.java:2478)
          at java.awt.Component.dispatchEvent(Component.java:4460)
          at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
          at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
          at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
          at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
          at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
          at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
          at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
  Java Result: 1</p>
  
  <p>PS: I am totally new to java. Is it a problem with my ODBC?</p>
  
  <p>Created connection in the constructor(sample()):</p>
  
  <pre><code>public sample() {
      initComponents();
      try
      {
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
      }
      catch(ClassNotFoundException ex)
      {
         JOptionPane.showMessageDialog(this, "Error!");
      }
  
  
      try
      {
      Connection conn=DriverManager.getConnection("jdbc:odbc:reg","system","suganthi");
      if(conn!=null)
      JOptionPane.showMessageDialog(this, "Connected!");
      }
      catch(SQLException ex)
      {
  
          System.out.println("Error");
      }
  }
  </code></pre>