Null return value from advice does not match primitive return type for - 碼上歡樂

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

本文轉載自查看原文 2020-04-25 08:59 1446 Java/ bug

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層

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

應該是自動拆箱的時出現的問題，把int換成 Integer 包裝類就行了，如果還報空指針的錯誤，就加個null判空。

完！

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