code: public Future<PutItemResult> putItemAsync(final PutItemRequest putItemRequest) 
              throws AmazonServiceException, AmazonClientException {
          return executorService.submit(new Callable<PutItemResult>() {
              public PutItemResult call() throws Exception {
                  return putItem(putItemRequest);
  		    }
  		});
      }
docs: <p>
  Creates a new item, or replaces an old item with a new item (including
  all the attributes).
  </p>
  <p>
  If an item already exists in the specified table with the same primary
  key, the new item completely replaces the existing item. You can
  perform a conditional put (insert a new item if one with the specified
  primary key doesn't exist), or replace an existing item if it has
  certain attribute values.
  </p>
  
  @param putItemRequest Container for the necessary parameters to
  execute the PutItem operation on AmazonDynamoDB.
  
  @return A Java Future object containing the response from the PutItem
  service method, as returned by AmazonDynamoDB.
  
  @throws AmazonClientException
  If any internal errors are encountered inside the client while
  attempting to make the request or handle the response.  For example
  if a network connection is not available.
  @throws AmazonServiceException
  If an error response is returned by AmazonDynamoDB indicating
  either a problem with the data in the request, or a server side issue.