java.lang.NullPointerException at org.hibernate.type.LongType.next(LongType.java
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jpa使用乐观锁，version字段不要自己维护，否则很容易出错。项目上线之后，报以上错误，开始以为是代码问题，后面检查线上数据库，才发现order关联的webuser的version有些为空。设置默认0就可以了！
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