Fix NPE issue in multipart S3 client #6594
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…ct containing empty content without supplying a content length
zoewangg
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Nov 28, 2025
...va/software/amazon/awssdk/services/s3/internal/multipart/utils/MultipartUploadTestUtils.java
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L-Applin
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RanVaknin
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...tware/amazon/awssdk/services/s3/internal/multipart/UploadWithUnknownContentLengthHelper.java
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RanVaknin
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* Fix NPE issue thrown when using multipart S3 client to upload an object containing empty content without supplying a content length * Apply suggestion from @zoewangg * Address feedback
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Motivation and Context
Fix NPE issue thrown when using multipart S3 client to upload an object containing empty content without supplying a content length. Fix #6464
When uploading an empty object with unknown content length using the S3 multipart client, a NullPointerException was thrown because the code didn't handle the case
where no async request body chunks are received before the stream completes.
Modifications
• Modified UploadWithUnknownContentLengthHelper to handle empty streams by checking if any async request body has been received before onComplete() is called
• Added null check in onNext() to fail gracefully if a null async request body is passed
• Renamed isFirstAsyncRequestBody to firstAsyncRequestBodyReceived for better clarity
• When no request body is received, use AsyncRequestBody.empty() for single object upload
Testing
• Added new tests
Types of changes
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
Checklist
• [x] I have read the CONTRIBUTING document
• [x] Local run of mvn install succeeds
• [x] My code follows the code style of this project
• [ ] My change requires a change to the Javadoc documentation
• [ ] I have updated the Javadoc documentation accordingly
• [x] I have added tests to cover my changes
• [x] All new and existing tests passed
• [x] I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new
file created by the script in .changes/next-release with your changes.
• [ ] My change is to implement 1.11 parity feature and I have updated LaunchChangelog
License
• [x] I confirm that this pull request can be released under the Apache 2 license