mybatis中方法返回泛型与resultType不一致的解决

public class A
}
public class B{
}

@Service()
public class AImpl implements AService {
private AMapper  aMapper ;
public List<B> increTrade(Map<String, Object> map) {
List<B> lst =aMapper.increTrade(map); //这里debug看到list是A类型,此时泛型误导人
return lst;
}
}
public interface AMapper {
List<B>increTrade(Map<String, Object> map);
}

<select id="increTrade" parameterType="java.util.Map" resultType="cn.easier.admin.model.A">
//-------------
</select>

resultType="java.util.HashMap"

</select>
  <select id="selectExceptionCountBymonths" resultType="java.util.HashMap"  >
SELECT
 DATE_FORMAT( report_date, '%Y%m' ) label ,
 COUNT( 0 ) value
FROM
 t_smoke_detector_record
 WHERE tsdr_type != "火灾告警"
GROUP BY
 label
 
  </select>

@ApiOperation(value = "按照月份统计报警条数",notes = "按照月份统计报警条数")
@GetMapping(value = "warnCountStatistics")
@ActionLog(value = "按照月份统计所有报警条数")
    public  List<Map<String,Object>>  warnCountStatistics(){
        List list = smokeDetectorRecordMapper.selectWarnCountBymonths();
        return list;