org.hibernate.MappingException: Could not determine type for: String 数据类型错误

用Hibernate连接数据库时出现了如下错误：
org.hibernate.MappingException: Could not determine type for: String, at table: labuser, for columns: [org.hibernate.mapping.Column(userid)]

at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:292)

at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:307)

at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)

at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:261)

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327)

at com.guet.orm.dao.AnimalDao.insertAnimals(AnimalDao.java:33)

at com.guet.orm.test.HibernateDaoTest.insertTiger(HibernateDaoTest.java:43)

at com.guet.orm.test.HibernateDaoTest.main(HibernateDaoTest.java:29)

根据错误提示找到对应的配置文件，最终发现错误根源在

<discriminator column="userid"
type="String"/>。

"String"是java的数据类型，Hibernate中对应的数据类型是"string",

在书写hibernate的配置文件时，要么使用"string"，要么使用"java.lang.String"。