Jboss 下的mysql启动的问题.......

[phoenixbull]

启动以后提示如下：
ObjectName: persistence.units:jar=EntityBean.jar,unitName=foshanshop
State: FAILED
Reason: javax.persistence.PersistenceException: org.hibernate.Hiber
on: Hibernate Dialect must be explicitly set
I Depend On:
jboss.jca:service=DataSourceBinding,name=DefaultMySqlDS
Depends On Me:
jboss.j2ee:jar=EntityBean.jar,name=PersonDAOBean,service=EJB3

ObjectName: jboss.j2ee:jar=EntityBean.jar,name=PersonDAOBean,service=
State: NOTYETINSTALLED
I Depend On:
persistence.units:jar=EntityBean.jar,unitName=foshanshop

--- MBEANS THAT ARE THE ROOT CAUSE OF THE PROBLEM ---
ObjectName: persistence.units:jar=EntityBean.jar,unitName=foshanshop
State: FAILED
Reason: javax.persistence.PersistenceException: org.hibernate.Hiber
on: Hibernate Dialect must be explicitly set
I Depend On:
jboss.jca:service=DataSourceBinding,name=DefaultMySqlDS
Depends On Me:
jboss.j2ee:jar=EntityBean.jar,name=PersonDAOBean,service=EJB3