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

报错：A different object with the s
错误信息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
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