#vulnerable code 
                                @Override
    public void run() {
        MongoTemplate mongoTemplate = SpringContextUtil.getBean(MongoTemplate.class);
        StockTopHoldersService stockTopHoldersService=SpringContextUtil.getBean(StockTopHoldersService.class);
        String code = getCode(mongoTemplate);
        try {
            stockTopHoldersService.refreshTopHolders(TushareApi.formatCode(code));
           UpdateResult updateResult= mongoTemplate.upsert(
                    new Query(Criteria.where("_id").is(code)),
                    new Update().set("holdersDate",Integer.valueOf(TradingDateUtil.getDateYYYYMMdd())),"stock_code_info");
           log.info("代码{}top holders 更新{}行",code,updateResult.getMatchedCount());
        } catch (Exception e) {
            e.printStackTrace();
            log.error("{}",e);
            ;
        }
    } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public void run() {
        try {
            MongoTemplate mongoTemplate = SpringContextUtil.getBean(MongoTemplate.class);
            StockTopHoldersService stockTopHoldersService=SpringContextUtil.getBean(StockTopHoldersService.class);
            String code = getCode(mongoTemplate);
            if(null==code){
                return;
            }
            stockTopHoldersService.refreshTopHolders(TushareApi.formatCode(code));
           UpdateResult updateResult= mongoTemplate.upsert(
                    new Query(Criteria.where("_id").is(code)),
                    new Update().set("holdersDate",Integer.valueOf(TradingDateUtil.getDateYYYYMMdd())),"stock_code_info");
           log.info("代码{}top holders 更新{}行",code,updateResult.getMatchedCount());
        } catch (Exception e) {
            e.printStackTrace();
            log.error("{}",e);
        }
    }