嗨，我下面有一个序列化程序

public class RegistrationSerializer implements JsonSerializer<Registration> {

private final PresenceService presenceService;

public RegistrationSerializer(PresenceService presenceService) {
    this.presenceService = presenceService;
}

@Override
public JsonElement serialize(Registration src, Type typeOfSrc, JsonSerializationContext context) {
    JsonObject element = new JsonObject();

    element.addProperty("endpoint", src.getEndpoint());
    element.addProperty("registrationId", src.getId());
    element.add("registrationDate", context.serialize(src.getRegistrationDate()));
    element.add("lastUpdate", context.serialize(src.getLastUpdate()));
    element.addProperty("address", src.getAddress().getHostAddress() + ":" + src.getPort());
    element.addProperty("smsNumber", src.getSmsNumber());
    element.addProperty("lwM2mVersion", src.getLwM2mVersion().toString());
    element.addProperty("lifetime", src.getLifeTimeInSec());
    element.addProperty("bindingMode", BindingMode.toString(src.getBindingMode()));
    element.add("rootPath", context.serialize(src.getRootPath()));
    element.add("objectLinks", context.serialize(src.getSortedObjectLinks()));
    element.add("secure", context.serialize(src.getIdentity().isSecure()));
    element.add("additionalRegistrationAttributes", context.serialize(src.getAdditionalRegistrationAttributes()));
    element.add("queuemode", context.serialize(src.usesQueueMode()));

    if (src.usesQueueMode()) {
        element.add("sleeping", context.serialize(!presenceService.isClientAwake(src)));
    }

    return element;
}

}
我想写一个反序列化程序版本，这样我就可以把我自己的注册对象添加到注册类中。注册类如下所示：注册类
我尝试过使用fromjson函数，但我不断收到错误，指出我没有正确地反序列化。任何帮助都将不胜感激。