数据库更新出错org.hibernate.NonUniqueObjectException

 org.springframework.orm.hibernate3.HibernateSystemException: a different object with the same identifier

value was already associated with the session: [netctoss.rights.domain.Role#7]; nested exception is

org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already

associated with the session: [netctoss.rights.domain.Role#7]

把数据访问层的更新方法中的update 改成merge就可以实现

public void update(Role r) {
  getHibernateTemplate().update(r);
 }
 

 
public void update(Role r) {
  getHibernateTemplate().merge(r);
 }