Examples of

    try {
      // Create an RPC request to begin a new transaction.
      BeginTransactionRequest.Builder treq = BeginTransactionRequest.newBuilder();
      // Execute the RPC synchronously.
      BeginTransactionResponse tres = datastore.beginTransaction(;
      // Get the transaction handle from the response.
      ByteString tx = tres.getTransaction();

      // Create an RPC request to get entities by key.
      LookupRequest.Builder lreq = LookupRequest.newBuilder();
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