a different object with the same identifier value was already associated with the session: [com.sie.gqgx.model.CompanyChangeLogMid#1640016]; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.sie.gqgx.model.CompanyChangeLogMid#1640016]
利用spring 配置业务层的事务时，同个方法中多次调用了saveOfUpdate方法时就会报错。
利用了merge()的方法之后在方法调用完后又会报事务回滚的错！
------解决方案--------------------
为了解决session关闭的问题，spring提供了opsessionviewfilter。去web。xml添加以下这个过滤器