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DecryptRequest decryptRequest = new DecryptRequest();
decryptRequest.setCiphertextBlob(encryptedKey);
 

// call AWS KMS to decrypt the key
DecryptResult decryptResult = kmsClient.decrypt(decryptRequest);
// parse out the decryption result
String strKeyId = decryptResult.getKeyId();
ByteBuffer plaintextKey = decryptResult.getPlaintext();