code: public void setPropertiesLocations(List<String> locations) {
          Properties properties = null;
          PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
          for (String location: locations) {
              properties = load(properties, resolver, location);
          }
          if (properties != null && properties.size() > 0) {
              configure(properties);
          }
      }
docs: Configures with a list of properties files, which could be on either the
  file system (file: location) or the class path (classpath: location).