Erro no Hibernate - org.hibernate.MappingException: Unknown entity

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  
  <display-name>Test</display-name>
  
  <welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>

  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>*.faces</url-pattern>
  </servlet-mapping>

  <!-- Rich Faces -->
  <context-param>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>server</param-value>
  </context-param>

  <context-param>
    <param-name>org.richfaces.SKIN</param-name>
    <param-value>blueSky</param-value>
  </context-param>

  <context-param>
    <param-name>org.richfaces.CONTROL_SKINNING</param-name>
    <param-value>enable</param-value>
  </context-param>

  <filter> 
    <display-name>RichFaces Filter</display-name> 
    <filter-name>richfaces</filter-name> 
    <filter-class>org.ajax4jsf.Filter</filter-class> 
  </filter> 

  <filter-mapping> 
    <filter-name>richfaces</filter-name> 
    <servlet-name>Faces Servlet</servlet-name>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
  </filter-mapping>

  <listener>
    <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
  </listener> 

  <!-- Filter Hibernate -->
  <filter>
  	<filter-name>HibernateSessionFilter</filter-name>
  	<filter-class>##.###.######.#######.HibernateSessionFilter</filter-class>
  </filter>

  <filter-mapping>
  	<filter-name>HibernateSessionFilter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
  
</web-app>

package ##.###.######.#######.util;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class HibernateSessionFilter implements Filter {

	@Override
	public void destroy() {
		// TODO Auto-generated method stub

	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain filterChain) throws IOException, ServletException {
		
		//HibernateUtil.openSession();
		
		try{
			
			//HibernateUtil.currentSession().beginTransaction();
			
			filterChain.doFilter( request, response );
			
			//HibernateUtil.currentSession().getTransaction().commit();
			
			
		}catch (Exception e) {
			
			throw new ServletException(e);
			
		}finally{
			
			//HibernateUtil.closeCurrentSession();
		}
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}

package ##.###.######.#######.util;

import org.apache.log4j.Logger;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

public class HibernateUtil {

	private static Logger logger = Logger.getLogger(HibernateUtil.class);
	
	private static SessionFactory sessionFactory;
	
	private static ThreadLocal<Session> sessions = new ThreadLocal<Session>();
	
	static{
		sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
	}
	
	public static Session openSession(){
		
		if ( sessions.get() != null ) {
			logger.error("There was a session for this thread already!!!");
			//grave alguem não fechou uma ja aberta!
		}
		
		sessions.set( sessionFactory.openSession() );
		
		return sessions.get();		
	}
	
	public static void closeCurrentSession(){
		sessions.get().close();
		sessions.set( null );
	}
	
	public static Session currentSession(){
		return sessions.get();
	}
	
}

package ##.###.######.#######.entity;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Department implements Serializable {

	private static final long serialVersionUID = -3457627102443272382L;

	@Id
	@GeneratedValue( strategy = GenerationType.AUTO )
	private Long id;
	
	@Column( unique = true, nullable = false, length = 50 )
	private String description;
	
	@Column( nullable = false )
	private boolean status;

	/**
	 * @return the id
	 */
	public Long getId() {
		return id;
	}

	/**
	 * @param id the id to set
	 */
	public void setId(Long id) {
		this.id = id;
	}

	/**
	 * @return the description
	 */
	public String getDescription() {
		return description;
	}

	/**
	 * @param description the description to set
	 */
	public void setDescription(String description) {
		this.description = description;
	}

	/**
	 * @return the status
	 */
	public boolean isStatus() {
		return status;
	}

	/**
	 * @param status the status to set
	 */
	public void setStatus(boolean status) {
		this.status = status;
	}

	/* (non-Javadoc)
	 * @see java.lang.Object#hashCode()
	 */
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((id == null) ? 0 : id.hashCode());
		return result;
	}

	/* (non-Javadoc)
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		final Department other = (Department) obj;
		if (id == null) {
			if (other.id != null)
				return false;
		} else if (!id.equals(other.id))
			return false;
		return true;
	}
	
}

package ##.###.######.#######.managedbeans;

import java.util.List;

import javax.faces.event.ActionEvent;

import org.hibernate.Session;

import ##.###.######.#######.dao.Dao;
import ##.###.######.#######.entity.Department;
import ##.###.######.#######.util.HibernateUtil;

public class DepartmentMB {

	public Department department;
	
	public DepartmentMB() {
		department = new Department();
	}
	
	/**
	 * @return the department
	 */
	public Department getDepartment() {
		return department;
	}

	/**
	 * @param department the department to set
	 */
	public void setDepartment(Department department) {
		this.department = department;
	}

	public void save( ActionEvent event ) {
		
		System.out.println( "Saving Department: " + department.getDescription() );
		
		Session session = HibernateUtil.openSession();

		HibernateUtil.currentSession().beginTransaction();
		
		Dao<Department> departmentDao = new Dao<Department>( session, Department.class );		
		
		departmentDao.save( department );
		
		HibernateUtil.currentSession().getTransaction().commit();
		HibernateUtil.closeCurrentSession();
		
		department = new Department();
	}
	
	public List<Department> getDepartments(){
		System.out.println("Loading departments...");
		Session session = HibernateUtil.openSession();
		Dao<Department> dao = new Dao<Department>( session, Department.class );
		return dao.list();
	}

}

<?xml version='1.0' encoding='utf-8'?>
  <!DOCTYPE hibernate-configuration PUBLIC 
  	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
	<session-factory>
	
		<!-- Database connection settings -->
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="connection.url">jdbc:mysql://localhost:3306/test?autoReconnect=true</property>
		<property name="connection.username">root</property>
		<property name="connection.password">root</property>

		<!--<property name="hbm2ddl.auto">update</property>-->
		
		<!-- SQL dialect -->
		<property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
		
		<!-- Configurando o c3p0 -->
		<property name="c3p0.max_size">10</property>
		<property name="c3p0.min_size">2</property>
		<property name="c3p0.timeout">5000</property>
		<property name="c3p0.max_statements">10</property>
		<property name="c3p0.idle_test_period">3000</property>
		<property name="c3p0.acquire_increment">2</property>
		
		<!-- Configurando cache EhCache -->
		<property name="hibernate.current_session_context_class">thread</property>
		<property name="cache.provider_class">org.hibernate.cache.EhCacheProvider</property>
		<property name="cache.use_query_cache">true</property>
				
		<!-- Configurando propriedades de debug -->
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>
		<property name="generate_statistics">true</property>
		<property name="use_sql_comments">true</property>
		
		<!-- Configurando as Classes -->
		<mapping class="##.###.######.#######.entity.Department" />
		
	</session-factory>
</hibernate-configuration>

<?xml version="1.0" encoding="UTF-8"?>
<faces-config version="1.2" xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xi="http://www.w3.org/2001/XInclude"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd">

  <application>
   <message-bundle>messages</message-bundle>
  </application>
  
  <managed-bean>
    <managed-bean-name>departmentMB</managed-bean-name>
    <managed-bean-class>##.###.######.#######.managedbeans.DepartmentMB</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
   </managed-bean>
  
  <managed-bean>
    <managed-bean-name>authenticator</managed-bean-name>
    <managed-bean-class>##.###.######.#######.managedbeans.LoginHandler</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
   </managed-bean>
 
  <navigation-rule>
    <from-view-id>/login.jsp</from-view-id>
    <navigation-case>
      <from-outcome>sucesso</from-outcome>
      <to-view-id>/department.jsp</to-view-id>
    </navigation-case>
  </navigation-rule>

  <navigation-rule>
    <navigation-case>
      <from-outcome>logging</from-outcome>
      <to-view-id>/login.jsp</to-view-id>
    </navigation-case>
  </navigation-rule>

  <lifecycle>
    <phase-listener>##.###.######.#######.listener.Authenticator</phase-listener>
  </lifecycle>
  
</faces-config>

/**
 * 
 */
package ##.###.######.#######.main;

import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class DatabaseGenerator {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		Configuration config = new AnnotationConfiguration();
		config.configure();
		SchemaExport se = new SchemaExport( config );
		se.create( true, true );
	}

}

package ##.###.######.#######.main;

import java.util.List;

import org.hibernate.Session;

import ##.###.######.#######.dao.Dao;
import ##.###.######.#######.entity.Department;
import ##.###.######.#######.managedbeans.DepartmentMB;
import ##.###.######.#######.util.HibernateUtil;

public class Stub {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		DepartmentMB depto = new DepartmentMB();
		
		List<Department> listaDeptos = depto.getDepartments();
		
		for (Department department : listaDeptos) {
			System.out.println( department.getDescription() );
		}
		
		Department department = new Department();
		department.setId( new Long( 2 ) );
		department.setDescription( "Secretary" );
		department.setStatus( false );
		
		Session session = HibernateUtil.currentSession();
		HibernateUtil.currentSession().beginTransaction();
		
		Dao<Department> departmentDao = new Dao<Department>( session, Department.class );		
		
		departmentDao.merge( department );

		HibernateUtil.currentSession().getTransaction().commit();
		HibernateUtil.closeCurrentSession();
	}

}

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
	<persistence-unit name="Test">
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
	</persistence-unit>
</persistence>