org.hibernate.MappingException: Could not determine type for: String

来源：互联网发布：河北天然气知乎编辑：程序博客网时间：2024/05/06 16:31

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: animal, for columns: [org.hibernate.mapping.Column(animal_type)]
   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="animal_type"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"。