code: public List<Object> transactionLoad(TransactionLoadRequest transactionLoadRequest) {
          for (Object object : transactionLoadRequest.getObjectsToLoad() ) {
              if (!model.targetType().equals(object.getClass())) {
                  throw new DynamoDBMappingException("Input object is of the classType: " + object.getClass() + " but tableMapper is declared with classType: " + model.targetType());
              }
          }
          return mapper.transactionLoad(transactionLoadRequest);
      }
docs: Transactionally loads objects specified by transactionLoadRequest by calling
  {@link com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper#transactionLoad(TransactionLoadRequest)} API.
  @param transactionLoadRequest List of objects to load
  @return List of objects
  @see com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper#transactionLoad(TransactionLoadRequest)