code: public Resource getConfigurationResource(final ResourceSelection selection)
  		throws ConfigurationException {
  		Resource resource = getResource(selection);
  		if (resource == null) {
  			String catalog = selection.getCatalog();
  			String version = selection.getVersion();
  			String name = selection.getName();
  			throw new ConfigurationException("未找到类别 " + catalog + " 版本 " + version + " 的配置 " + name);
  		}
  		return resource;
  	}
docs: 定位配置资源。
  
  @param selection
  配置资源选择
  @return 配置资源
  @throws ConfigurationException
  配置错误