我们使用方法分组来用dubbo，每个分组有自己权限，但是dubbo:registry标签 username & password 不生效，
让我不得不使用
```
    <dubbo:registry
            address="zookeeper://username:pwd@ip:port"
            group="xxx"/>
```
这种写法失效
```
    <dubbo:registry
            address="zookeeper://ip:port"
            username="username"
            password="pwd"/>
```

}
    }
    private void createMonitorIfAbsent() {
        if (this.monitor != null) {
            return;
        }
        ConfigManager configManager = ConfigManager.getInstance();
        setMonitor(
                configManager
                        .getMonitor()
                        .orElseGet(() -> {
                            MonitorConfig monitorConfig = new MonitorConfig();
                            monitorConfig.refresh();
                            return monitorConfig;
                        })
        );
    }
    protected void checkMetadataReport() {
        // 
        if (metadataReportConfig == null) {
            setMetadataReportConfig(new MetadataReportConfig());
        }
        metadataReportConfig.refresh();
        if (!metadataReportConfig.isValid()) {
            logger.warn("There's no valid metadata config found, if you are using the simplified mode of registry url, " +
                    "please make sure you have a metadata address configured properly.");
        }
    }
    void startConfigCenter() {
        if (configCenter == null) {