Class LocalClientSession

Hi, i’ve just upgraded Openfire from 3.3.3 to 3.4.0 beta1. When I compile a plugin for instant Feeds, I have this problem:

cannot find symbol

symbol: class LocalClientSession

location: package org.jivesoftware.openfire.session

import org.jivesoftware.openfire.session.LocalClientSession;

Can you help me? Thanks