TreeTable + Hibernate + notification

Hello vaadiners,

I got stucked on the ThreeTable component. I am using hibernate to fill treeTable with datas and all I want to achieve is this: When i click on the user in tree i want to show notification. I defined my own notification where I am using an object of entity User as a constructor parameter. The problem is, how to get that object to notification from click in the TreeTable?

package com.cooldatasoft.taskManager.user.gui;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Configurable;

import com.cooldatasoft.domain.model.Roles;
import com.cooldatasoft.domain.model.User;
import com.cooldatasoft.domain.model.UserProjectRoles;
import com.cooldatasoft.domain.service.RolesService;
import com.cooldatasoft.domain.service.UserProjectRolesService;
import com.cooldatasoft.domain.service.UserService;
import com.cooldatasoft.security.TaskManagerSecurityManager;
import com.cooldatasoft.taskManager.MainPage;
import com.cooldatasoft.taskManager.component.TaskManagerNotification;
import com.vaadin.annotations.AutoGenerated;
import com.vaadin.data.Item;
import com.vaadin.event.ItemClickEvent;
import com.vaadin.event.ItemClickEvent.ItemClickListener;
import com.vaadin.ui.AbsoluteLayout;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.TreeTable;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window.Notification;

@Configurable(preConstruction = true)
public class LeftPanel extends CustomComponent implements ItemClickListener {

	@AutoGenerated
	private AbsoluteLayout mainLayout;
	@AutoGenerated
	private VerticalLayout verticalLayout_1;

	@Autowired
	TaskManagerSecurityManager securityManager;
	@Autowired
	UserProjectRolesService userProjectRolesService;
	@Autowired
	RolesService rolesService;
	@Autowired
	UserService userService;

	protected static final String NAME_PROPERTY = "Name";
	protected static final String ROLE_PROPERTY = "Role";
	protected static final String PROJECT_PROPERTY = "Project";
	protected TreeTable treetable;
	protected MainPage mainPage;

	public void setMainPage(MainPage mainPage) {
		this.mainPage = mainPage;
	}

	/**
	 * The constructor should first build the main layout, set the composition
	 * root and then do any custom initialization.
	 * 
	 * The constructor will not be automatically regenerated by the visual
	 * editor.
	 */
	public LeftPanel() {
		buildMainLayout();
		setCompositionRoot(mainLayout);

		createTreeTable();
		verticalLayout_1.addComponent(treetable);
		verticalLayout_1.setExpandRatio(treetable, 1.0f);

	}

	@AutoGenerated
	private AbsoluteLayout buildMainLayout() {
		// common part: create layout
		mainLayout = new AbsoluteLayout();
		mainLayout.setImmediate(false);
		mainLayout.setWidth("100%");
		mainLayout.setHeight("100%");
		mainLayout.setMargin(false);

		// top-level component properties
		setWidth("100.0%");
		setHeight("100.0%");

		// verticalLayout_1
		verticalLayout_1 = new VerticalLayout();
		verticalLayout_1.setImmediate(false);
		verticalLayout_1.setWidth("100.0%");
		verticalLayout_1.setHeight("100.0%");
		verticalLayout_1.setMargin(false);
		mainLayout.addComponent(verticalLayout_1, "top:0.0px;left:0.0px;");

		return mainLayout;
	}

	public void createTreeTable() {
		// Create the treetable
		treetable = new TreeTable();
		treetable.setWidth("100.0%");
		treetable.setHeight("100.0%");

		// Add Table columns
		treetable.addContainerProperty(PROJECT_PROPERTY, String.class, "");

		treetable.addListener(this);
		treetable.setImmediate(true);
		treetable.setSelectable(true);

		List<UserProjectRoles> projects = userProjectRolesService
				.getUserProjectRolesByIdUser(securityManager.getCurrentUser());
		List<Roles> roles = rolesService.getAllRoles();

		Object proj = null;
		Object role = null;
		Object user = null;
		List<UserProjectRoles> userss = new ArrayList<UserProjectRoles>();

		for (UserProjectRoles upr : projects) {
			proj = treetable.addItem(new Object[] { upr.getIdProject()
					.getName() }, null);
			treetable.setParent(proj, null);

			for (Roles r : roles) {
				role = treetable
						.addItem(new Object[] { r.getRoleName() }, null);
				treetable.setParent(role, proj);
				userss = userService.getUsersByRole(upr.getIdProject(), r);

				for (UserProjectRoles u : userss) {

					user = treetable.addItem(new Object[] { u.getIdUser()
							.toString() /*
										 * ,user_on_project.getIdRole().getRoleName
										 * ()
										 */}, null);

					treetable.setParent(user, role);
					treetable.setCollapsed(user, true);
					treetable.setChildrenAllowed(user, false);
				}
			}
			treetable.setCollapsed(proj, true);
		}
	}
	
	@Override
	public void itemClick(ItemClickEvent event) {
		switch (event.getButton()) {
		case ItemClickEvent.BUTTON_LEFT:
			Item clickedItem = treetable.getContainerDataSource().getItem(event.getItemId());
			
			String parameter = clickedItem.getItemProperty("email").getValue().toString();

			User user = userService.getUserByEmail(parameter);

			getWindow().showNotification(TaskManagerNotification.showTableNotification("User info", user));
			break;
		}
	}
}

Any ides?