code: public Object lookup(String name) {
  		Object result = null;
  		for (Registry reg: registryList){
  			result = reg.lookup(name);
  			if (result != null){
  				break;
  			}
  		}
  		return result;
  	}
docs: Looks up from all encapsulated Registry(s) one by one, and returns the first result found.<br>
  按次序从所封装的Registry中查找，返回第一个找到的结果。
  <p>
  If no result can be found, null will be returned.
  <p>
  如果全都找不到，则返回null。
  
  @see org.apache.camel.spi.Registry#lookup(java.lang.String)