org.springframework.orm.hibernate3.HibernateSystemException: Unknown entity

错误信息：

org.springframework.orm.hibernate3.HibernateSystemException: Unknown entity: Book; nested exception is org.hibernate.MappingException: Unknown entity: Book
Caused by: org.hibernate.MappingException: Unknown entity: Book
 at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:550)
 at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:68)
 at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
 at org.hibernate.impl.SessionImpl.get(SessionImpl.java:815)
 at org.springframework.orm.hibernate3.HibernateTemplate$2.doInHibernate(HibernateTemplate.java:489)
 at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:372)
 at org.springframework.orm.hibernate3.HibernateTemplate.get(HibernateTemplate.java:483)
 at org.springframework.orm.hibernate3.HibernateTemplate.get(HibernateTemplate.java:477)
 at cn.mybookshop.book.dao.impl.BookDAOImpl.findBookById(BookDAOImpl.java:48)
 at cn.mybookshop.book.logic.impl.BookSrvImpl.findBookById(BookSrvImpl.java:49)
 at cn.test.mybookshop.book.BookTest.main(BookTest.java:16)

解决方案：

book = (Book) getHibernateTemplate().get("Book",id);

加入包名：

book = (Book) getHibernateTemplate().get("com.bookshop.Book",id);

看看Demo喔...该是配置文件里没把你的Book 加进去哦或者少了@Entity