Null return value from advice does not match primitive return type for

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is 
org.springframework.aop.AopInvocationException: Null return value from advice does not match primitive return type for: 

public abstract int com.*.VoterDao.todayCountVote(java.util.Date)

下面是我的dao层

@Query("select sum(v.daysNum) from Voter v where v.updateTime>?1")
int todayCountVote(Date date);

应该是自动拆箱的时出现的问题，把int换成 Integer 包装类就行了，如果还报空指针的错误，就加个null判空。

完！