解决 a different object with the same identifier value was already associated with the session 报错

用 hibernate 做批量添加操作时，报错：a different object with the same identifier value was already associated with the session 报错。 网上搜到一些，解决方法，如用 session.merge()，用 session.clear() 等，都不管用。   然后又搜到一篇博客，说到的方法管用： http

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