![image](https://user-images.githubusercontent.com/54169514/199922630-ba1b1417-e124-40b1-bac7-49158e2adbca.png)

文档上ApplicationConfig的enableFileCache属性默认true，但是在Dubbo3.1版本中，该属性似乎默认为null，导致mapping和元数据无法在本地缓存。

![image](https://user-images.githubusercontent.com/54169514/199923129-c99ea29b-45c5-40d1-bc21-1fbb44830fc7.png)

/**
     * The preferred protocol(name) of this application
     * convenient for places where it's hard to determine which is the preferred protocol
     */
    private String protocol;
    /**
     * The protocol used for peer-to-peer metadata transmission
     */
    private String metadataServiceProtocol;
    /**
     * Metadata Service, used in Service Discovery
     */
    private Integer metadataServicePort;
    /**
     * used to set extensions of probe in qos
     */
    private String livenessProbe;
    private String readinessProbe;
    private String startupProbe;
    private String registerMode;
    private Boolean enableEmptyProtection;
    /**
     * thread pool management: default/isolation
     */
    private String executorManagementMode;
    public ApplicationConfig() {
    }
    public ApplicationConfig(ApplicationModel applicationModel) {
        super(applicationModel);
    }