Erro metodo save da classe SessionFactory

Programação Java
#1

galera a minha classe funciona direitinho ateh chegar no metodo save©, ela gera uma exception estranha

essa

Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not insert: [br.com.casa.classes.Cliente]

[code]ackage br.com.casa.dao;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

import br.com.casa.classes.Cliente;

public class ClienteDAO {

private Session session;
private SessionFactory factory;

public ClienteDAO(){ 
	AnnotationConfiguration conf = new AnnotationConfiguration();
	conf.addAnnotatedClass(Cliente.class);
	factory = conf.buildSessionFactory();	
}

public void Adiciona(Cliente c){
	session = factory.openSession();
	[color=red]session.save(c);[/color]
	session.close(); 
}

}[/code]

#2

a exception nao sai encima

mais é essa aqui

Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not insert: [br.com.casa.classes.Cliente]
#3

a exception nao sai encima

mais é essa aqui
[color=red]Exception in thread “main” org.hibernate.exception.SQLGrammarException: could not insert: [br.com.casa.classes.Cliente][/color]

#4