Java 将本机查询JPA的resultset设置为POJO会引发空指针异常

我想将结果集列表转换为实体类。 我的本机查询：

 @Query("select type,name,latitude,longitute,111.045* DEGREES (ACOS(COS(RADIANS(:latitude))*COS (RADIANS(latitude))*COS(RADIANS(:longitute) - RADIANS (longitute))"
            + "+SIN (RADIANS (:latitude))*SIN (RADIANS(latitude)))) As distance_in_km from Place ORDER BY distance_in_km ")
     List<Object[]> findBylattitudeAndlongitute(@Param("latitude") double latitude ,@Param("longitute") double longitute );

服务类别：

 List<Object[]>  places = Repository.findBylattitudeAndlongitute(latitude, longitute);  
Place place = null;
             for (Object[] pla:places)
             {
                 place.setType((String) pla[0]);
          place.setName((String) pla[1]);   
             }

由于距离（单位：km）不是一个变量实体，我无法直接映射结果集。查询已成功执行，我正在获取响应列表

我尝试将pla[0]设置为type，但它显示空指针异常。 帮我解决这个问题

您需要添加以下瞬态列：

您需要将Spring Data@Query改为Hibernate本机查询：

String sql = "select type as {p.type}, name as {p.name}, latitude as {p.latitude}, longitute as {p.longitute},111.045* DEGREES (ACOS(COS(RADIANS(:latitude))*COS (RADIANS(latitude))*COS(RADIANS(:longitute) - RADIANS (longitute))"
            + "+SIN (RADIANS (:latitude))*SIN (RADIANS(latitude)))) As {p.distanceInKm} from Place p ORDER BY {p.distanceInKm} ";

List<Place> places = (List<Place>) session.createSQLQuery(sql)
.setParameter("latitude", latitude)
.setParameter("longitute", longitute)
.addEntity("p", Place.class).list();

@Transient
private Double distance_in_km;

String sql = "select type as {p.type}, name as {p.name}, latitude as {p.latitude}, longitute as {p.longitute},111.045* DEGREES (ACOS(COS(RADIANS(:latitude))*COS (RADIANS(latitude))*COS(RADIANS(:longitute) - RADIANS (longitute))"
            + "+SIN (RADIANS (:latitude))*SIN (RADIANS(latitude)))) As {p.distanceInKm} from Place p ORDER BY {p.distanceInKm} ";

List<Place> places = (List<Place>) session.createSQLQuery(sql)
.setParameter("latitude", latitude)
.setParameter("longitute", longitute)
.addEntity("p", Place.class).list();