#vulnerable code 
                                public void initialize() {
        JSONObject accessControlTransport = AclUtils.getYamlDataObject(fileHome + fileName,
            JSONObject.class);

        if (accessControlTransport == null || accessControlTransport.isEmpty()) {
            throw new AclException(String.format("%s file  is not data", fileHome + fileName));
        }
        log.info("BorkerAccessControlTransport data is : ", accessControlTransport.toString());
        JSONArray globalWhiteRemoteAddressesList = accessControlTransport.getJSONArray("globalWhiteRemoteAddresses");
        if (globalWhiteRemoteAddressesList != null && !globalWhiteRemoteAddressesList.isEmpty()) {
            for (int i = 0; i < globalWhiteRemoteAddressesList.size(); i++) {
                addGlobalWhiteRemoteAddress(globalWhiteRemoteAddressesList.getString(i));
            }
        }

        JSONArray accounts = accessControlTransport.getJSONArray("accounts");
        List<PlainAccessConfig> plainAccessList = accounts.toJavaList(PlainAccessConfig.class);
        if (plainAccessList != null && !plainAccessList.isEmpty()) {
            for (PlainAccessConfig plainAccess : plainAccessList) {
                this.addPlainAccessResource(getPlainAccessResource(plainAccess));
            }
        }
    } 
                            #location 17 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public void initialize() {
        JSONObject accessControlTransport = AclUtils.getYamlDataObject(fileHome + fileName,
            JSONObject.class);

        if (accessControlTransport == null || accessControlTransport.isEmpty()) {
            throw new AclException(String.format("%s file  is not data", fileHome + fileName));
        }
        log.info("BorkerAccessControlTransport data is : ", accessControlTransport.toString());
        JSONArray globalWhiteRemoteAddressesList = accessControlTransport.getJSONArray("globalWhiteRemoteAddresses");
        if (globalWhiteRemoteAddressesList != null && !globalWhiteRemoteAddressesList.isEmpty()) {
            for (int i = 0; i < globalWhiteRemoteAddressesList.size(); i++) {
                addGlobalWhiteRemoteAddress(globalWhiteRemoteAddressesList.getString(i));
            }
        }

        JSONArray accounts = accessControlTransport.getJSONArray("accounts");
        if (accounts != null && !accounts.isEmpty()) {
            List<PlainAccessConfig> plainAccessList = accounts.toJavaList(PlainAccessConfig.class);
            for (PlainAccessConfig plainAccess : plainAccessList) {
                this.addPlainAccessResource(getPlainAccessResource(plainAccess));
            }
        }
    }