java.math.BigInteger cannot be cast to java.lang.Long错误的解决方案

场景

mysql数据库中

字段为`authority_id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '权限ID',

问题

public interface BmRoleAuthorityRepository extends JpaRepository{
 
@Query(value = "SELECT authority_id FROM bm_role_authority where role_id = ?1", nativeQuery = true)
List getAllAuthorityIdByRoleId(Long roleId);

直接执行，获取到的List是

之后我想循环authorityIdList

for (Long authorityId : authorityIdList) {

结果报错：

java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long

解决方案

没有看到有什么特别好的方法，只能将BigInterger的List先转换为String，然后再转换为Long List

 
List authorityIdList = bmRoleAuthorityRepository.getAllAuthorityIdByRoleId(roleId);
 
if(authorityIdList == null || authorityIdList.isEmpty()) {
   authorityIdList = new ArrayList<>();
}
String idArray = JSONArray.toJSONString(authorityIdList);

之后再处理这个String，将其转换为Long list

 
// [1,2,3] convert to String[]
String[] split = StringUtils.split(StringUtils.substring(allAuthorityIdByRoleId, 1,
        allAuthorityIdByRoleId.length() - 1), ",");
// guava 将String[] convert to Long[]
authorityIdList.addAll(Lists.transform(Arrays.asList(split), Longs.stringConverter()));