Hello KMS key

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.kms.KmsAsyncClient;
import software.amazon.awssdk.services.kms.model.ListKeysRequest;
import software.amazon.awssdk.services.kms.paginators.ListKeysPublisher;
import java.util.concurrent.CompletableFuture;

/**
 * Before running this Java V2 code example, set up your development
 * environment, including your credentials.
 *
 * For more information, see the following documentation topic:
 *
 * https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 */
public class HelloKMS {
    public static void main(String[] args) {
        listAllKeys();
    }

    public static void listAllKeys() {
        Region region = Region.US_WEST_2;
        KmsAsyncClient kmsAsyncClient = KmsAsyncClient.builder()
            .region(region)
            .build();
        ListKeysRequest listKeysRequest = ListKeysRequest.builder()
            .limit(15)
            .build();

        ListKeysPublisher keysPublisher = kmsAsyncClient.listKeysPaginator(listKeysRequest);
        CompletableFuture<Void> future = keysPublisher
            .subscribe(r -> r.keys().forEach(key ->
                System.out.println("The key ARN is: " + key.keyArn() + ". The key Id is: " + key.keyId())))
            .whenComplete((result, exception) -> {
                if (exception != null) {
                    System.err.println("Error occurred: " + exception.getMessage());
                } else {
                    System.out.println("Successfully listed all keys.");
                }
            });

        // Wait for the asynchronous operation to complete
        try {
            future.join();
        } catch (Exception e) {
            System.err.println("Failed to list keys: " + e.getMessage());
        }
    }
}