![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 qos host to listen
     */
    private String qosHost;
    /**
     * The qos port to listen
     */
    private Integer qosPort;
    /**
     * Should we accept foreign ip or not?
     */
    private Boolean qosAcceptForeignIp;
    /**
     * Customized parameters
     */
    private Map<String, String> parameters;
    /**
     * Config the shutdown.wait
     */
    private String shutwait;
    private String hostname;
    /**
     * Metadata type, local or remote, if choose remote, you need to further specify metadata center.
     */
    private String metadataType;
    /**
     * Used to control whether register instance to registry or not. Set to 'false' only when instance is pure consumer.
     */
    private Boolean registerConsumer;
    private String repository;
    private Boolean enableFileCache;