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GenerateDataKeyRequest dataKeyRequest = new GenerateDataKeyRequest();
dataKeyRequest.setKeyId(KMS_KEY);
dataKeyRequest.setKeySpec(DataKeySpec.AES_256);
AWSKMSClient kmsClient = new AWSKMSClient();
GenerateDataKeyResult dataKeyResult = kmsClient.generateDataKey(dataKeyRequest);

ByteBuffer plainTextKey = dataKeyResult.getPlaintext(); //Use this to encrypt/decrypt data locally, delete after use.
ByteBuffer encryptedKey = dataKeyResult.getCiphertextBlob(); //Persist this along with the data, to be used to obtain a plainTextKey from KMS later.