src/main/java/mobi/designmyapp/common/util/UtilsFactory.java
public static ResourceService getResourceService() {
    if (resourceService == null) {
      try {
        Class clazz = Class.forName(RESOURCE_SERVICE);
        resourceService = (ResourceService) clazz.newInstance();
      } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
        LOGGER.warn("Cannot instanciate util: {}", e.getMessage());
        throw new IllegalStateException(e);
      }
    }
    return resourceService;
  }
public static ResourceService getResourceService() {
    if (resourceService == null) {
      try {
        Class clazz = Class.forName(RESOURCE_SERVICE);
        resourceService = (ResourceService) clazz.newInstance();
      } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
        LOGGER.warn("Cannot instanciate util: {}", e.getMessage());
        throw new IllegalStateException(e);
      }
    }
    return resourceService;
  }
Retrieve ResourceService implementation
@return ResourceService instance