> +
> +   public abstract int modifiedIndex();
> +
> +   public abstract int ttl();
> +
> +   @Nullable
> +   public abstract String value();
> +
> +   Node() {
> +   }
> +
> +   @SerializedNames({ "createdIndex", "dir", "nodes", "expiration", "key", 
> "modifiedIndex", "ttl", "value" })
> +   public static Node create(int createdIndex, boolean dir, List<Node> 
> nodes, String expiration, String key,
> +         int modifiedIndex, int ttl, String value) {
> +      if (nodes == null)
> +         nodes = ImmutableList.of();

Just apply the conditional inline when passing the parameter. We'd better avoid 
changing the reference for input parameters.

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