Unable to complete transfer: Connection pool shut down

[graveend]

I am using transfermanager to upload file to s3. But on calling waitForCompletion, it is throwing the below exception:
Unable to complete transfer: Connection pool shut down

Here is my code:
@Bean public TransferManager s3TransferManager(AmazonS3 amazonS3) { return TransferManagerBuilder.standard().withS3Client(amazonS3).build(); }

Upload xfer = s3TransferManager.upload(bucketName, keyPrefix+"/test_file.csv", file); try { xfer.waitForCompletion(); } catch (AmazonClientException | InterruptedException e) { e.printStackTrace(); }
Exception:
com.amazonaws.AmazonClientException: Unable to complete transfer: Connection pool shut down
Thanks!

[varunnvs92]

The error indicates that the underlying connection pool is being shutdown while the transfer is in progress. It happens when a thread closes the s3 client or calls shutdownNow on transfer manager. Is the transfer manager shared across multiple threads?
Is it possible that the Transfer Manager is being shut down by another thread?

[varunnvs92]

Feel free to reopen if you still have the issue.