Configurando o Hibernate no NetBeans

<property 
		name="hibernate.dialect">
		org.hibernate.dialect.MySQLDialect
	</property>
	<property 
		name="hibernate.connection.driver_class">
		com.mysql.jdbc.Driver
	</property>
	<property 
		name="hibernate.connection.url">
		jdbc:mysql://localhost/3306/tcc?autoReconnect=true
	</property>
	<property 
		name="hibernate.connection.username">
		root
	</property>
	<property 
		name="hibernate.connection.password">
	</property>		
	
	<!-- Condiguração do c3p0 -->
	
	<property name="hibernate.c3p0.max_size">10</property>
	<property name="hibernate.c3p0.min_size">2</property>
	<property name="hibernate.c3p0.timeout">5000</property>		
	<property name="hibernate.c3p0.max_statements">10</property>
	<property name="hibernate.c3p0.idle_test_period">3000</property>
	<property name="hibernate.c3p0.acquire_increment">2</property>			

	<!-- Configurações de debug -->

	<property name="show_sql">true</property>
    <property name="use_outer_join">true</property>	
    <property name="hibernate.generate_statistics">true</property>
    <property name="hibernate.use_sql_comments">true</property>
    	
	<mapping resource="Curso.hbm.xml"/>
	<mapping resource="Disciplina.hbm.xml"/>
	<mapping resource="Turma.hbm.xml"/>			
	<mapping resource="Pessoa.hbm.xml"/>	
	<mapping resource="Aluno.hbm.xml"/>		
	<mapping resource="Professor.hbm.xml"/>		
	<mapping resource="Endereco.hbm.xml"/>
		
</session-factory>

<class name="negocio.Cliente" table="cliente" lazy="false">

    <id name="Codigo" type="integer">
        <generator class="increment"/>
     </id>
    <property name="Nome" type="string"/>
    <property name="Cpf" type="string"/>
    <property name="Rg" type="string"/>
    <property name="Email" type="string"/>
    <property name="Telefone" type="string"/>

</session-factory>

Cara desculpa a amolação, nem sei como agradecer a sua ajuda, mas eu usei o seu hibernate.cfg.xml e seu Cliente.hbm.xml e continua apresentando o mesmo erro " hinernate.cfg.xml" neste linha de código :

SessionFactory factory;

factory = new Configuration().configure().buildSessionFactory();

private static DataManager instance = new DataManager();
protected URL url;
protected Configuration cfg ;
protected SessionFactory sf ;
private Session session ;
private boolean aberta;

public static DataManager getInstance() {
    return instance;
}

public void close()  {
    session.close();
    sf.close();
    aberta=false;
}

public boolean isOpen(){
    return aberta;
}

public String open() {
    try {
        url = DataManager.class.getResource("hibernate.cfg.xml");
        cfg = new Configuration();
        cfg.configure(url);
        sf = cfg.buildSessionFactory();
        session = sf.openSession();
        session.setFlushMode(FlushMode.COMMIT);
        aberta=true;
        return "";
    } catch(HibernateException e) {
        System.out.println("ERRO FATAL: camada de persistencia DataManager / Hibernate - " + e.getMessage());
        e.printStackTrace();
        aberta=false;
        return e.getMessage();
    }
    
}

private DataManager() {
    
}

public void save(Object entity) throws HibernateException{

getInstance().open();

Transaction t = session.beginTransaction();

session.saveOrUpdate(entity);

t.commit();

getInstance().close();

}

public void delete(Object entity) throws HibernateException{

getInstance().open();

Transaction t = session.beginTransaction();

session.delete(entity);

t.commit();

getInstance().close();

}

Olá Sérgio, então eu rodei esta classe que vc me passou e está apresentando este erro :

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).

log4j:WARN Please initialize the log4j system properly.

Exception in thread “main” java.lang.NullPointerException

at org.hibernate.cfg.Configuration.configure(Configuration.java:1365)

at hibernate.DataManager.open(DataManager.java:49)

at hibernate.DataManager.main(DataManager.java:84)

Java Result: 1