1、hibernate中出现 文档根元素 "hibernate-mapping" 必须匹配 DOCTYPE 根 "hibernate-configuration" 错误!

<!DOCTYPE hibernate-configuration PUBLIC	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"	"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">userDome.hbm.xml
<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC 	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"	"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
2、异常org.hibernate.HibernateException: The database returned no natively generated identity
异常分析：数据库的表结构中关于id，没有设置auto increment。把数据库的id设置为主键自增长即可。