public class MyIntegrator implements Integrator {
    private static Logger logger = Logger.getLogger(MyIntegrator.class);

    @Override
    public void integrate(Configuration configuration, SessionFactoryImplementor sessionFactory, SessionFactoryServiceRegistry serviceRegistry) {
        logger.info("Install GlobalInterceptor in " + configuration.getProperty("hibernate.session_factory_name"));
        configuration.setInterceptor(new GlobalInterceptor());
    }

    ...
}

@Override
public void integrate(Metadata metadata, SessionFactoryImplementor sessionFactory, SessionFactoryServiceRegistry serviceRegistry) {
        // TODO Set the Interceptor for all Sessions ... but how?
}

final SessionFactoryBuilder sessionFactoryBuilder = metadata.getSessionFactoryBuilder();
sessionFactoryBuilder.applyInterceptor( new GlobalInterceptor() );

/**
* Called when a Hibernate transaction is begun via the Hibernate <tt>Transaction</tt>
* API. Will not be called if transactions are being controlled via some other
* mechanism (CMT, for example).
*
* @param tx The Hibernate transaction facade object
*/
void afterTransactionBegin(Transaction tx);

/**
* Called before a transaction is committed (but not before rollback).
*
* @param tx The Hibernate transaction facade object
*/
void beforeTransactionCompletion(Transaction tx);

/**
* Called after a transaction is committed or rolled back.
*
* @param tx The Hibernate transaction facade object
*/
void afterTransactionCompletion(Transaction tx);