Mapper method ‘xxx‘ attempted to return null from a method with a primitive return type (int)

报错情况：

Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Mapper method 'com.aqiuo.mapper.UserMapper.login attempted to return null from a method with a primitive return type (int).

报错原因：

 
        select * from user where account = #{account} and password = #{password};
    

  int login(@Param("account") String account,@Param("password") String password);

select 查询不到数据就会返回null ,但是int 是不接受null的，所以出现这个情况

解决方法：

将返回值改成Integer

 
        select * from user where account = #{account} and password = #{password};
    

Integer login(@Param("account") String account,@Param("password") String password);