![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)

public ApplicationConfig(String name) {
        setName(name);
    }
    public ApplicationConfig(ApplicationModel applicationModel, String name) {
        super(applicationModel);
        setName(name);
    }
    @Override
    protected void checkDefault() {
        super.checkDefault();
        if (protocol == null) {
            protocol = DUBBO;
        }
        if (hostname == null) {
            try {
                hostname = InetAddress.getLocalHost().getHostName();
            } catch (UnknownHostException e) {
                LOGGER.warn(COMMON_UNEXPECTED_EXCEPTION,"","","Failed to get the hostname of current instance.", e);
                hostname = "UNKNOWN";
            }
        }
        if (executorManagementMode == null) {
            executorManagementMode = EXECUTOR_MANAGEMENT_MODE_DEFAULT;
        }
    }
    @Parameter(key = APPLICATION_KEY, required = true)
    public String getName() {
        return name;
    }
    public void setName(String name) {