Ajuda ao gerar codigo .hbm - hibernate

<?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>
	<!-- a SessionFactory instance listed as /jndi/name -->
	<session-factory name="org/hibernate/SessionFactory">
		<!-- properties -->
		<property name="connection.driver_class">
			com.mysql.jdbc.Driver
		</property>
		<property name="connection.url">
			jdbc:mysql://localhost:3306/sin
		</property>
		<property name="dialect">
			org.hibernate.dialect.MySQLDialect
		</property>
		<property name="show_sql">true</property>
		<property name="connection.username">root</property>
		<property name="connection.password">123</property>
		<!-- mapping files -->
		<mapping resource="map/Municipio.hbm.xml" />
		<mapping resource="map/Praia.hbm.xml" />
		
	</session-factory>
</hibernate-configuration>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="bean.Municipio" table="municipio">
		<id name="codMunicipio" column="codMunicipio" type="int">
			<generator class="native">
			</generator>
		</id>
		<property name="descMunicipio" type="java.lang.String" column="descMunicipio"/>

		<one-to-many name="praia" class="Praia"column="codPraia" />
       
	</class>
</hibernate-mapping>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="bean.Praia" table="praia">
		<id name="codPraia" column="codPraia" type="int">
			<generator class="native">
			</generator>
		</id>
		<property name="descPraia" type="java.lang.String" column="descPraia"/>

	  <many-to-one name="municipio"class="Municipio"column="codMunicipio" />

            </set>
	</class>
</hibernate-mapping>

package testes;

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

import bean.Municipio;

public class AddMunicipio {

	public static void main(String[] args) {

		SessionFactory sf = new Configuration().configure("/conf/hibernate.cfg.xml").buildSessionFactory();
		
		Session session = sf.openSession();
		
		Transaction tx = session.beginTransaction();
		
		Municipio municipio = new Municipio();
		municipio.setDescMunicipio("palhoça");
	
				
		session.save(municipio);
		tx.commit();
		session.close();
		
		
	}

}