UnitOfWork- problem with registerAllObjects method call

Question

Hi,
I have created passed a vector of objects to the register method of the UnitOfWork but to my surprise i noticed only the last object in the vector is commited to the database.
My code snippet is as below
UnitOfWork uow = getUnitOfWork() ;
Vector shiftClone = (Vector) uow.registerAllObjects(obj) ;
uow.commit();
thanks
vasu               

Answer 1

Based on your code, I don't think you understand the concept of static variables.
You should probably have 2 panels.  One panel hosts the button.
The other does the painting of the rectangle.
public class ButtonPanel extends JPanel implements ActionListener {
     private JButton button = new JButton("Make Rectangle");
     private RectanglePanel rp = null;
     public ButtonPanel(RectanglePanel rp) {
          this.rp = rp;
          button.addActionListener(this);
          setLayout(new FlowLayout(FlowLayout.CENTER));
          add(button);
     public void actionPerformed(ActionEvent evt) {
          rp.setRectangle(generateRandomRectangle());
          rp.repaint();
     private static Rectangle generateRandomRectangle() {
public class RectanglePanel extends JPanel {
     private Rectangle r = null;
     public void setRectangle(Rectangle r) {
          this.r = r;
     public void paint(Graphics _g) {
          super.paint(_g);
          Graphics2D g = (Graphics2D) _g;
          if (r != null)
               g.draw(r);
public class MyProg {
     public static void main(String[] args) {
          JFrame f = new JFrame();
          RectanglePanel rp  =new RectanglePanel();
          ButtonPanel bp = new ButtonPanel(rp);
          JPanel panel = new JPanel(new BorderLayout());
          panel.add(rp, BorderLayout.NORTH);
          panel.add(bp, BorderLayout.CENTER);
          f.setContentPane(panel);
          f.setSize(400, 400);
          f.show();
}