启动服务器之后可能会出现
Hibernate问题之'hibernate.dialect' not set
的问题,
解决办法 1,检查hibernate.cfg.xml配置文件中有没有添加dialect
<property name="dialect">
org.hibernate.dialect.Oracle9Dialect
</property>
2,检查数据库服务是否开启
3,如果你是用java代码手动得到sessionfactory 那么就要注意是否使用原来，configuration.configure()方法
没有configure()就会去classpath找hibernate.properties文件，有configure就去找hibernate.cfg.xml文件
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