#vulnerable code 
                                private void initNamespace(Properties properties) {
        String namespaceTmp = null;

        String isUseCloudNamespaceParsing =
            properties.getProperty(PropertyKeyConst.IS_USE_CLOUD_NAMESPACE_PARSING,
                System.getProperty(SystemPropertyKeyConst.IS_USE_CLOUD_NAMESPACE_PARSING,
                    String.valueOf(Constants.DEFAULT_USE_CLOUD_NAMESPACE_PARSING)));

        if (Boolean.parseBoolean(isUseCloudNamespaceParsing)) {
            namespaceTmp = TemplateUtils.stringBlankAndThenExecute(namespaceTmp, new Callable<String>() {
                @Override
                public String call() {
                    return TenantUtil.getUserTenantForAcm();
                }
            });

            namespaceTmp = TemplateUtils.stringBlankAndThenExecute(namespaceTmp, new Callable<String>() {
                @Override
                public String call() {
                    String namespace = System.getenv(PropertyKeyConst.SystemEnv.ALIBABA_ALIWARE_NAMESPACE);
                    return StringUtils.isNotBlank(namespace) ? namespace : EMPTY;
                }
            });
        }

        if (StringUtils.isBlank(namespaceTmp)) {
            namespaceTmp = properties.getProperty(PropertyKeyConst.NAMESPACE);
        }
        namespace = StringUtils.isNotBlank(namespaceTmp) ? namespaceTmp.trim() : EMPTY;
        properties.put(PropertyKeyConst.NAMESPACE, namespace);
    } 
                            #location 29 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                private void initNamespace(Properties properties) {
        namespace = ParamUtil.parseNamespace(properties);
        properties.put(PropertyKeyConst.NAMESPACE, namespace);
    }