Hibernate loading JDBC driver error access to Dialectresolutioninfo cannot is null when ' Hibernate.dialect ' not set

Exception in thread "main" org.hibernate.HibernateException:Access  toDialectresolutioninfo cannot is null when ' hibernate.dialect ' not set
The program basically hasn't moved.,previously used version of the 3.3.2,after today's change to 4.3.4 's version,,changed the method of Sessionfactory generation,the rest is unchanged.,You can start running .,It's about 30min .,you can't run it!

Hibernate4 has abandoned the original buildsessionfactory, use the following, no problem.

Configuration cfg = new configuration (). Configure ();
standardserviceregistry serviceregistry = new Standardserviceregistrybuilder ()
. Applysettings (Cfg.getproperties ()). build ();
sessionfactory sessionfactory = cfg.buildsessionfactory (serviceregistry);

Hibernate loading JDBC driver error access to Dialectresolutioninfo cannot is null when ' Hibernate.dialect ' not set