错误信息
A different object with the same identifier value was already associated with the session
解决方案
实体类中主键没有标明为自增，需要加入在 @Id 标签上加入以下标签
@GeneratedValue(strategy=GenerationType.IDENTITY) // 主键自增
A different object with the same identifier value was already associated with the session
实体类中主键没有标明为自增，需要加入在 @Id 标签上加入以下标签
@GeneratedValue(strategy=GenerationType.IDENTITY) // 主键自增
本文标题：报错：A different object with the s
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