解決a different object with the same identifier value was already associated with the session錯誤

20:41:15

  今天做一個saveorupdate操作報錯: 

 org.springframework.orm.hibernate3.HibernateSystemException: a different object with the same identifier value was already associated with the session: [com.xshcar.carcloud.entity.UboxTbl#1291]; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.xshcar.carcloud.entity.UboxTbl#1291] 

一個經典的hibernate錯誤:a different object with the same identifier value was already associated with the session xxxx
hibernate3.0以上使用merge()來合並兩個session中的同一對象　　

解決:

在daoimpl層調用hibernate的getHibernateTemplate().merge(對象)方法;

public boolean executeUpdate(T t) {
        boolean b=true;
        try {
       t=(T)this.getHibernateTemplate().getSessionFactory().getCurrentSession().merge(t);
            getHibernateTemplate().update(t);
        } catch (DataAccessException e) {
            e.printStackTrace();
            b=false;
        }
            
        return b;
    }