Настройка Hibernate + Tomcat + MySQL в Idea

import org.hibernate.SessionFactory;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
    private static final SessionFactory sessionFactory;

    static {
        try {
            // Create the SessionFactory
            Configuration configuration = new Configuration(); // ВОТ ЗДЕСЬ ВАЛИТСЯ
            configuration.configure();
            configuration.getProperties().list(System.out);
            sessionFactory = configuration.buildSessionFactory();
        } catch (HibernateException ex) {
            throw new RuntimeException("Configuration problem: " + ex.getMessage(), ex);
        }
    }

    public static final ThreadLocal session = new ThreadLocal();

    public static Session currentSession() throws HibernateException {
        Session s = (Session) session.get();
        // Open a new Session, if this Thread has none yet
        if (s == null) {
            s = sessionFactory.openSession();
            session.set(s);
        }
        return s;
    }

    public static void closeSession() throws HibernateException {
        Session s = (Session) session.get();
        session.set(null);
        if (s != null)
            s.close();
    }
}

java.lang.NoClassDefFoundError: org/dom4j/DocumentException
at main.HibernateUtil.<clinit>(HibernateUtil.java:19)
at main.Test.doGet(Test.java:27)