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![1678891955524](https://user-images.githubusercontent.com/31841743/225348655-2b03b0b0-2da0-4e34-bfd0-be07e6e54d60.jpg)
![1678891971675](https://user-images.githubusercontent.com/31841743/225348708-57f4df91-77c5-4b32-9e4e-cde573002ad2.jpg)
![image](https://user-images.githubusercontent.com/31841743/225348805-4a38363d-25c3-4245-ab33-ea1772c3f115.png)
可以看到按照图片顺序，properties中设置default属性，在我从configManager中打印的2个注册中心default值都为null,dubbo版本是3.0.12
private String protocol;
    /**
     * Network transmission type
     */
    private String transporter;
    private String server;
    private String client;
    /**
     * Affects how traffic distributes among registries, useful when subscribing multiple registries, available options:
     * 1. zone-aware, a certain type of traffic always goes to one Registry according to where the traffic is originated.
     */
    private String cluster;
    /**
     * The region where the registry belongs, usually used to isolate traffics
     */
    private String zone;
    /**
     * The group that services registry in
     */
    private String group;
    private String version;
    /**
     * Connect timeout in milliseconds for register center
     */
    private Integer timeout;
    /**
     * Session timeout in milliseconds for register center
     */
    private Integer session;
    /**