Use CompleteMultipartUpload with an AWS SDK

Complete a multipart upload in a directory bucket.

import com.example.s3.util.S3DirectoryBucketUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.CompleteMultipartUploadRequest;
import software.amazon.awssdk.services.s3.model.CompleteMultipartUploadResponse;
import software.amazon.awssdk.services.s3.model.CompletedMultipartUpload;
import software.amazon.awssdk.services.s3.model.CompletedPart;
import software.amazon.awssdk.services.s3.model.S3Exception;

import java.io.IOException;
import java.nio.file.Path;
import java.util.List;

import static com.example.s3.util.S3DirectoryBucketUtils.createDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.createDirectoryBucketMultipartUpload;
import static com.example.s3.util.S3DirectoryBucketUtils.createS3Client;
import static com.example.s3.util.S3DirectoryBucketUtils.deleteAllObjectsInDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.deleteDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.getFilePath;
import static com.example.s3.util.S3DirectoryBucketUtils.multipartUploadForDirectoryBucket;


    /**
     * This method completes the multipart upload request by collating all the
     * upload parts.
     *
     * @param s3Client    The S3 client used to interact with S3
     * @param bucketName  The name of the directory bucket
     * @param objectKey   The key (name) of the object to be uploaded
     * @param uploadId    The upload ID used to track the multipart upload
     * @param uploadParts The list of completed parts
     * @return True if the multipart upload is successfully completed, false
     *         otherwise
     */
    public static boolean completeDirectoryBucketMultipartUpload(S3Client s3Client, String bucketName, String objectKey,
            String uploadId, List<CompletedPart> uploadParts) {
        try {
            CompletedMultipartUpload completedMultipartUpload = CompletedMultipartUpload.builder()
                    .parts(uploadParts)
                    .build();
            CompleteMultipartUploadRequest completeMultipartUploadRequest = CompleteMultipartUploadRequest.builder()
                    .bucket(bucketName)
                    .key(objectKey)
                    .uploadId(uploadId)
                    .multipartUpload(completedMultipartUpload)
                    .build();

            CompleteMultipartUploadResponse response = s3Client.completeMultipartUpload(completeMultipartUploadRequest);
            logger.info("Multipart upload completed. ETag: {}", response.eTag());
            return true;
        } catch (S3Exception e) {
            logger.error("Failed to complete multipart upload: {} - Error code: {}", e.awsErrorDetails().errorMessage(),
                    e.awsErrorDetails().errorCode(), e);
            return false;
        }
    }