returns more than one elements; nested exception is javax.persistence.NonUniqueResultException: resu

org.springframework.dao.IncorrectResultSizeDataAccessException: result returns more than one elements; nested exception is javax.persistence.NonUniqueResultException: result returns more than one elements

初学Spring JPA，报了上面的错。

public interface AaRepository extends JpaRepository<AaUserIconType, Integer> {

 

 public AaUserIconType findByUserNo(String userNo);
}

由于函数返回值类型为AaUserIconType，将上面函数返回值类型由AaUserIconType改成List<AaUserIconType>即可

public interface AaRepository extends JpaRepository<AaUserIconType, Integer> {

 

 public List<AaUserIconType> findByUserNo(String userNo);
}