public AbstractExporter(Invoker<T> invoker) {
		if (invoker == null)
			throw new IllegalStateException("service invoker == null");
		if (invoker.getInterface() == null)
			throw new IllegalStateException("service type == null");
		if (invoker.getTpURL() == null)
			throw new IllegalStateException("service url == null");
		this.invoker = invoker;
	}