Problemas de lock nas tabelas com Hibernate

Senhores :smiley:
Estou com um sistema razoavelmente grande em produção a 4 dias e hoje recebi um e-mail do pessoal que cuida do banco falando que o sistema está dando lock nas tabela que ele usa.
Não tenho idéia do que possa ser, aparentemente fiz tudo correto.
No Hibernate, o que pode causar esse tipo de problema?

hibernate.cfg.xml

[code]<hibernate-configuration>
<session-factory>

	&lt;property name="connection.username"&gt;username&lt;/property&gt;
	&lt;property name="connection.url"&gt;jdbc:oracle:thin:@127.0.01:1521/base&lt;/property&gt;
	&lt;property name="dialect"&gt;org.hibernate.dialect.Oracle9Dialect&lt;/property&gt;
	&lt;property name="myeclipse.connection.profile"&gt;Oracle&lt;/property&gt;
	&lt;property name="connection.password"&gt;123&lt;/property&gt;
	&lt;property name="connection.driver_class"&gt;oracle.jdbc.driver.OracleDriver&lt;/property&gt;
	&lt;property name="show_sql"&gt;false&lt;/property&gt;
	&lt;property name="default_catalog"&gt;catalog&lt;/property&gt;

	&lt;property name="c3p0.min_size"&gt;2&lt;/property&gt;
	&lt;property name="c3p0.max_size"&gt;20&lt;/property&gt;
	&lt;property name="c3p0.timeout"&gt;600&lt;/property&gt;
	&lt;property name="c3p0.max_statements"&gt;50&lt;/property&gt;
	&lt;property name="c3p0.idle_test_period"&gt;3000&lt;/property&gt;

	&lt;!--  mapeamento dos hbm.xml --&gt;
	
&lt;/session-factory&gt;

</hibernate-configuration>[/code]

HibernateSessionFactory

[code]private static String CONFIG_FILE_LOCATION = “/hibernate.cfg.xml”;
private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
private static Configuration configuration = new Configuration();
private static org.hibernate.SessionFactory sessionFactory;
private static String configFile = CONFIG_FILE_LOCATION;

private HibernateSessionFactory() {

}

public static Session getSession() throws HibernateException {
Session session = (Session) threadLocal.get();

if (session == null || !session.isOpen()) {
	if (sessionFactory == null) {
		rebuildSessionFactory();
	}
	session = (sessionFactory != null) ? sessionFactory.openSession() : null;
	threadLocal.set(session);
}

return session;

}

public static void rebuildSessionFactory() {
try {
configuration.configure(configFile);
sessionFactory = configuration.buildSessionFactory();
} catch (Exception e) {
System.err
.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}

public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);

if (session != null) {
	session.flush();session.close();
}

}

public static org.hibernate.SessionFactory getSessionFactory() {
return sessionFactory;
}

public static void setConfigFile(String configFile) {
HibernateSessionFactory.configFile = configFile;
sessionFactory = null;
}

public static Configuration getConfiguration() {
return configuration;
}[/code]