title: JTable value from another JFrame
body: <p>I have <code>JTable</code> and I want to set value at specific cell from another frame. When I try to do it, I get null pointer exception. I changed the modifiers and removed the exception, but still can't set the value.</p>
  
  <p>Please guys help</p>
  
  <pre><code>public ChequeVoucher(int id,int row){
         try {
             String str = get_bank_name(id);
             System.out.println(str); 
  
             table.getModel().setValueAt(str,row,5);
             table.getModel().setValueAt(id,row,4);
         } catch (SQLException f) {
         }
         setBank(id,row); 
      }
  
  public void setBank(int id,int row){
      try {
              String str = get_bank_name(id);
              table.getModel().setValueAt(str,row,5);
          } catch (SQLException f) {
          }
      }
  </code></pre>
  
  <p>The chequevoucher is my constructor and this piece of code is good until this  </p>
  
  <pre><code> table.getModel().setValueAt(str,row,5);
  </code></pre>
  
  <p>and the <code>JFrame</code> I get the value from is </p>
  
  <pre><code>   table.addMouseListener(new MouseAdapter() {
         public void mouseClicked(MouseEvent e) {
           int row = table.getSelectedRow();
           int col = table.getSelectedColumn();
           String str_id = (String)GetID(row,0); 
           int id = Integer.parseInt(str_id);
           ChequeVoucher CV = new ChequeVoucher(id,row); 
           setVisible(false);
          }
       });
  </code></pre>
  
  <p>The access modifiers wasn't static so I get the following error stack</p>
  
  <pre>
  Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException 
  at client.ChequeVoucher.(ChequeVoucher.java:215) 
  at client.popupBanks$3.mouseClicked(popupBanks.java:130) 
  at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253) 
  at java.awt.Component.processMouseEvent(Component.java:6292) 
  at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) 
  at java.awt.Component.processEvent(Component.java:6054) 
  at java.awt.Container.processEvent(Container.java:2041) 
  at java.awt.Component.dispatchEventImpl(Component.java:4652) 
  at java.awt.Container.dispatchEventImpl(Container.java:2099) 
  at java.awt.Component.dispatchEvent(Component.java:4482) 
  at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577) 
  at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4247) 
  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:4482) 
  at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644) 
  at java.awt.EventQueue.access$000(EventQueue.java:85) 
  at java.awt.EventQueue$1.run(EventQueue.java:603) 
  at java.awt.EventQueue$1.run(EventQueue.java:601) 
  at java.security.AccessController.doPrivileged(Native Method) 
  at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
  at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) 
  at java.awt.EventQueue$2.run(EventQueue.java:617) 
  at java.awt.EventQueue$2.run(EventQueue.java:615) 
  at java.security.AccessController.doPrivileged(Native Method) 
  at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:614) 
  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)
  </pre>
  
  <p>When I made the modifiers static, I get no exceptions but nothing happens and I can't listen to the <code>JTable</code> anymore </p>
  
  <pre><code> case KeyEvent.VK_F5:
       switch(col){
           case 4:
           //show the banks 
           popupBanks pB = new popupBanks(row); 
           pB.setVisible(true);
  
           break;
    }
  </code></pre>
  
  <p>Sorry for the previous unclear post </p>