关于 Hibernate4.1+Spring3.1+Spring Data JPA+Oracle 12c Dialect错误

错误描述：

Caused by: org.hibernate.HibernateException: Unable to determine Dialect to use [name=Oracle, majorVersion=12]; user must register resolver or explicitly set 'hibernate.dialect'
 at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:105)
 at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:67)
 at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:146)
 at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
 at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
 at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
 at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)
 at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2277)
 at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2273)
 at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1742)
 at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:94)
 at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:905)
 ... 49 more
persistence.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" 
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
            xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
            http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
            
    <persistence-unit name="myJPA" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <non-jta-data-source>dataSource</non-jta-data-source>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle9Dialect" />
            <property name="hibernate.max_fetch_depth" value="3" />
            <property name="hibernate.hbm2ddl.auto" value="update" />    
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true" />
            <property name="javax.persistence.validation.mode" value="none"/>
        </properties>
    </persistence-unit>
            
</persistence>

希望大神知道下，对应Oracle 12c的hibernate.dialect值应该是什么，10g也不行，或者说是其他配置的问题吗？在线等……