Peux-tu jeter un coup d'oeil:

public Object construct() 
	{
		UserModalityManager.startModality();
		UserManagementBrowserHandler bh = UserManagementBrowserHandler.getCurrentBrowser();
		if (requestType_.equals("DELETE"))
		{
		  try
		  {
		    userManager_.removeUser(ctx_,user_);
		    DefaultMutableTreeNode node = (DefaultMutableTreeNode)node_.getParent();
	        int k = 0;
	        if (node != null)
	        {
	            k = node.getIndex(node_);
	            node.remove(k);
	        }
	        int[] childrenremoved = new int[1];
	        Object[] noderemoved = new Object[1];
	        childrenremoved[0] = k;
	        noderemoved[0] = node_;
	        ((DefaultTreeModel) bh.getTree().getModel()).nodesWereRemoved(node, childrenremoved, noderemoved);
		  }
		  catch (UserGuiException guiEx)
	      {
	        //trace_.lowTrace("UserManagementBrowserHandler:UnableToRemoveUser");
			UserManagementBrowserHandler.messageErrorDisplay(guiEx.getMessage());
	      }
	      catch (Exception e)
	      {
	          //trace_.lowTrace("UserManagementBrowserHandler:UnableToRemoveUser");
	        UserManagementBrowserHandler.messageErrorDisplay(e.getMessage());
	      }
		}
		else if (requestType_.equals("MULTI-DELETE"))
		{
		  UserManagementBrowserHandler bh2 = UserManagementBrowserHandler.getCurrentBrowser();
		  bh2.removeSelectedUsers(selectedUsers_);
		}
		else if (requestType_.equals("CREATE"))
		{
		  actionListener_.createUser();	
		}
		else if (requestType_.equals("UPDATE"))
		{
		  actionListener_.updateUser();  	
		}
		else if (requestType_.equals("FIND"))
		{
		  uw_.findUser();	
		}
		else if (requestType_.equals("SearchInAllContext"))
		{
		  uw_.SearchInAllContexts();	
		}
		else if (requestType_.equals("GetDef"))
		{
			
		}
		else if (requestType_.equals("UpdateContextConf"))
		{
		  
		  try
		  {
		    userManager_.UpdateContextConfiguration();
		    bh.doAfterUpdateContext();     
		  }
		  catch (UserGuiException e)
		  {
		    UserManagementBrowserHandler.messageErrorDisplay(e.getMessage());
		  }	
		}
		else if (requestType_.equals("UPDATEPWD"))
		{
			actionListener_.updatePwd();
		}
		else if (requestType_.equals("AUTHENTICATION"))
		{
		  userAuthen_.setCursor(new Cursor(Cursor.WAIT_CURSOR));
		  userAuthen_.doOnApplyButton();
		}
			
		return "";

	}