code: public CMAAsset fetchOne(String spaceId, String environmentId, String assetId) {
      assertNotNull(spaceId, "spaceId");
      assertNotNull(environmentId, "environmentId");
      assertNotNull(assetId, "assetId");
  
      return service.fetchOne(spaceId, environmentId, assetId).blockingFirst();
    }
docs: Fetch an Asset with the given {@code assetId} from the given space and environment.
  
  @param spaceId       Space ID
  @param environmentId Environment ID
  @param assetId       Asset ID
  @return {@link CMAAsset} result instance
  @throws IllegalArgumentException if spaceId is null.
  @throws IllegalArgumentException if assetId is null.