#vulnerable code 
                                private void initAuthEnv() {
        String paramUserName = getInitParameter(InitServletData.PARAM_NAME_USERNAME);
        if (!StringUtils.isEmpty(paramUserName)) {
            this.initServletData.setUsername(paramUserName);
        }

        String paramPassword = getInitParameter(InitServletData.PARAM_NAME_PASSWORD);
        if (!StringUtils.isEmpty(paramPassword)) {
            this.initServletData.setPassword(paramPassword);
        }

        try {
            String param = getInitParameter(InitServletData.PARAM_NAME_ALLOW);
            this.initServletData.setAllowList(parseStringToIP(param));
        } catch (Exception e) {
            logger.error("initParameter config error, allow : {}", getInitParameter(InitServletData.PARAM_NAME_ALLOW), e);
        }

        try {
            String param = getInitParameter(InitServletData.PARAM_NAME_DENY);
            this.initServletData.setDenyList(parseStringToIP(param));
        } catch (Exception e) {
            logger.error("initParameter config error, deny : {}", getInitParameter(InitServletData.PARAM_NAME_DENY), e);
        }

        // 采集缓存命中数据
        redisTemplate = getRedisTemplate();
        BeanFactory.getBean(StatsService.class).syncCacheStats(redisTemplate);
    } 
                            #location 28 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                private void initAuthEnv() {
        String paramUserName = getInitParameter(InitServletData.PARAM_NAME_USERNAME);
        if (!StringUtils.isEmpty(paramUserName)) {
            this.initServletData.setUsername(paramUserName);
        }

        String paramPassword = getInitParameter(InitServletData.PARAM_NAME_PASSWORD);
        if (!StringUtils.isEmpty(paramPassword)) {
            this.initServletData.setPassword(paramPassword);
        }

        try {
            String param = getInitParameter(InitServletData.PARAM_NAME_ALLOW);
            this.initServletData.setAllowList(parseStringToIP(param));
        } catch (Exception e) {
            logger.error("initParameter config error, allow : {}", getInitParameter(InitServletData.PARAM_NAME_ALLOW), e);
        }

        try {
            String param = getInitParameter(InitServletData.PARAM_NAME_DENY);
            this.initServletData.setDenyList(parseStringToIP(param));
        } catch (Exception e) {
            logger.error("initParameter config error, deny : {}", getInitParameter(InitServletData.PARAM_NAME_DENY), e);
        }
    }