报错:attempted to return null from a method with a primitive return type (int）
2019-04-04 20:22
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报错:attempted to return null from a method with a primitive return type (int）
报错:attempted to return null from a method with a primitive return type (int）
为了这个问题折腾了1个多小时，真的很无语
产生这样的问题遇到过两种情况:
1.某个事务没有提交，导致一直无法更新
查看事务
select * from information_schema.INNODB_TRX;
查看锁
select * from information_schema.INNODB_LOCKS;
查看锁等待
select * from information_schema.INNODB_LOCK_WAITS;
kill掉对应 thread 就好 （开发环境的时候）
2.update语句用了@Select注解，或者是在XML中配置写错了标签（概率极大）
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