![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)

}
    @Parameter(key = ENABLE_EMPTY_PROTECTION_KEY)
    public Boolean getEnableEmptyProtection() {
        return enableEmptyProtection;
    }
    public void setEnableEmptyProtection(Boolean enableEmptyProtection) {
        this.enableEmptyProtection = enableEmptyProtection;
    }
    @Parameter(excluded = true, key = APPLICATION_PROTOCOL_KEY)
    public String getProtocol() {
        return protocol;
    }
    public void setProtocol(String protocol) {
        this.protocol = protocol;
    }
    @Parameter(key = METADATA_SERVICE_PORT_KEY)
    public Integer getMetadataServicePort() {
        return metadataServicePort;
    }
    public void setMetadataServicePort(Integer metadataServicePort) {
        this.metadataServicePort = metadataServicePort;
    }
    @Parameter(key = METADATA_SERVICE_PROTOCOL_KEY)
    public String getMetadataServiceProtocol() {
        return metadataServiceProtocol;
    }
    public void setMetadataServiceProtocol(String metadataServiceProtocol) {
        this.metadataServiceProtocol = metadataServiceProtocol;
    }
    @Parameter(key = LIVENESS_PROBE_KEY)