Exemplo de criação de SessionFactory com Scala e Hibernate 4.2.

HibernateSessionFactory.scala

package 

import org.hibernate.service.{ServiceRegistryBuilder, ServiceRegistry}
import org.hibernate.cfg.Configuration
import org.hibernate.{Session, SessionFactory}
import scala.collection.JavaConversions._

object HibernateSessionFactory {

        def buildSessionFactory(dbDriver:String = "org.postgresql.Driver",
                                dbDialect:String = "org.hibernate.dialect.PostgreSQLDialect", 
                                dbPath:String = "jdbc:postgresql://localhost:5432", 
                                dbUser:String = "usuario",
                                dbPassword:String = "senha"): SessionFactory = {

                val cfg:Configuration = new Configuration()
                    .setProperty("hibernate.connection.driver", dbDriver)
                    .setProperty("hibernate.dialect", dbDialect)
                    .setProperty("hibernate.connection.url", dbPath)
                    .setProperty("hibernate.connection.user", dbUser)
                    .setProperty("hibernate.connection.password", dbPassword)
                    .setProperty("hibernate.show_sql", "false")
                    .setProperty("hibernate.hbm2ddl.auto", "update")
                    .setProperty("hibernate.c3p0.min_size", "100")
                    .setProperty("hibernate.c3p0.max_size", "300")
                    .setProperty("hibernate.c3p0.timeout", "1800")
                    .setProperty("hibernate.c3p0.max_statements", "100")
                    .setProperty("hibernate.generate_statistics", "true")
                    .addAnnotatedClass(classOf[Buddy])

            cfg.buildSessionFactory( buildServiceRegistry(cfg) )
        }

        private def buildServiceRegistry(cfg:Configuration):ServiceRegistry = {

            val serviceRegistryBuilder:ServiceRegistryBuilder  = new ServiceRegistryBuilder()
            
            serviceRegistryBuilder.applySettings(cfg.getProperties());
            
            serviceRegistryBuilder.buildServiceRegistry()
        }
}