It is really a pit for novices to use myeclipse, but the problem has to be solved.
When our project joins spring, the class 'org.springframework.orm.hibernate3.LocalSessionFactoryBean' not found appears, just put
Change hibernate3 to the version number of hibernate you installed . If I installed hibernate4, then I will change to org.springframework.orm.hibernate4.LocalSessionFactoryBean and the error will disappear.
Thank you, I will never use this integrated pit novice tool again.