JTable em JScrollPane

class SelectTable implements MouseListener   
   {     
      @SuppressWarnings({ "deprecation", "unchecked" })  
      public void mouseClicked(MouseEvent ev)   
      {     
         index = tableForn.getSelectedRow();        
         Object c = tableForn.getValueAt(index, 0);  
         String cod = c.toString();           
         String n = (String) tableForn.getValueAt(index, 1);  
         txtfornec.setText(n);  
         PedidoImpl pImp = new PedidoImpl();  
           
         try  
         {  
         tbprod   = pImp.listarP(cod);  //recebe resposta   
         }catch (Exception e1) {  
            e1.printStackTrace();  
         }  
           
         tbprod.setPreferredScrollableViewportSize(new Dimension(240,140));  
         scrollProd = new JScrollPane(tbprod);//não executa  
         JOptionPane.showMessageDialog(null,//executa scrollProd);  
           
         btex.setEnabled(true);  
      }