show different popupmenu

hello there,

i have a JTree which gets populated from the db.the structure of my Jtree is like this

-c
 -d
   -f
    -g

now i want to have a popupmenu for each of those nodes.i mean i want to have different popup menu for each nodes.for example the parent node c will have "add c","delete c","edit c"    node d will have "add d","delete d","edit d" and so on.
i tried to use

DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
selectedNode.getLevel()
 but this does not work when i right click on the nodes.i get this error java.lang.NullPointerException.but if i left click it first then right clcik it sjows me the level.

also i want to know how do i implement my code so the i get different pop menu according to the nodes i right clcik.
my code below shows the same popup menu for anywhere i click on my jtree

//constr
treePopupMenu = createPopupMenuDslam();

public void mouseReleased(MouseEvent me)
              {
                    if (me.isPopupTrigger())
                    {
                          DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
                          treePopupMenu.show(me.getComponent(), me.getX(), me.getY());
                          System.out.println(selectedNode.getLevel());
                    }
              }
        });

private JPopupMenu createPopupMenuDslam()
    {
          final JPopupMenu pm = new JPopupMenu();
          
          JMenuItem addItem = new JMenuItem("  Add  ");
          addItem.setActionCommand("add");
          addItem.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent ae) {
                      JOptionPane.showConfirmDialog(pm, "Was pressed popup menu ADD item");
                }
          });
          pm.add(addItem);
          
          JMenuItem editItem = new JMenuItem("  Edit  ");
          editItem.setActionCommand("edit");
          editItem.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent ae) {
                      JOptionPane.showConfirmDialog(pm, "Was pressed popup menu EDIT item");
                }
          });
          pm.add(editItem);
          
          pm.add(new JSeparator());
          
          JMenuItem deleteItem = new JMenuItem("  Delete  ");
          deleteItem.setActionCommand("delete");
            deleteItem.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent ae) {
                      JOptionPane.showConfirmDialog(pm, "Was pressed popup menu DELETE item");
                }
          });         
          pm.add(deleteItem);
          
          return pm;
    }

cheers
zolf