javax.persistence.PersistenceException: org.hibernate.HibernateException: Hibernate Dialect must be explicitly set

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org.hibernate.HibernateException: Hibernate Dialect must be explicitly set
org.hibernate.HibernateException: Hibernate Dialect must be explicitly set	at org.hibernate.dialect.DialectFactory.determineDialect(DialectFactory.java:57)	at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:39)	at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:409)	at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:119)	at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2006)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1289)	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:691)	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:698)	at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:121)	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)	at org.jboss.seam.persistence.EntityManagerFactory.createEntityManagerFactory(EntityManagerFactory.java:85)	at org.jboss.seam.persistence.EntityManagerFactory.startup(EntityManagerFactory.java:50)	at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)	at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:125)	at org.jboss.seam.Component.callComponentMethod(Component.java:2082)	at org.jboss.seam.Component.callCreateMethod(Component.java:1997)	at org.jboss.seam.Component.newInstance(Component.java:1968)	at org.jboss.seam.contexts.Contexts.startup(Contexts.java:304)	at org.jboss.seam.contexts.Contexts.startup(Contexts.java:278)	at org.jboss.seam.contexts.ServletLifecycle.endInitialization(ServletLifecycle.java:95)	at org.jboss.seam.init.Initialization.init(Initialization.java:555)	at org.jboss.seam.mock.BaseSeamTest.init(BaseSeamTest.java:939)	at org.jboss.seam.mock.SeamTest.init(SeamTest.java:42)