'hibernate.dialect' must be set when no Connection avalable

今天测试程序,报下面这个错误,以前也遇到过,这次开始做个异常累记.以防下次遇到,还是不知道怎么回事.

Exception in thread "main" org.hibernate.HibernateException: 'hibernate.dialect' must be set when no Connection avalable

at org.hibernate.dialect.resolver.DialectFactory.buildDialect(DialectFactory.java:107)

at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:138)

at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2119)

at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2115)

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1339)

at com.entity.HibernateTest.testTransaction(HibernateTest.java:25)

at com.entity.HibernateTest.main(HibernateTest.java:21)

我的测试内容是这么写的:

 

 由此看来,报hibernate.dialect异常,不一定真的是hibernate的dialect异常