Скачать или смотреть Resolving the Premature end of Content-Length delimited message body Error in Java with Amazon S3

Learn how to fix the `Premature end of Content-Length delimited message body` error when retrieving object metadata in Amazon S3 using Java.
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This video is based on the question https://stackoverflow.com/q/63888442/ asked by the user 'Shruti Joshi' ( https://stackoverflow.com/u/13734939/ ) and on the answer https://stackoverflow.com/a/63890076/ provided by the user 'Parsifal' ( https://stackoverflow.com/u/13400729/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Premature end of Content-Length delimited message body Error

Have you ever encountered the frustrating Premature end of Content-Length delimited message body error while working with Amazon S3 in Java? This error typically manifests when attempting to retrieve an object's metadata, leading to confusion and delays in your development process. In this guide, we will explore the underlying causes of this error and provide a clear, step-by-step solution to effectively resolve it.

The Problem: What Causes This Error?

The error occurs when your code tries to close an input stream that has not been properly read, leading to a connection closure that was not intended. In the context of your code snippet, you’re attempting to access the last modified date of an S3 object, but you encounter this error after the obj.close() statement. Here's a quick look at the original code:

[[See Video to Reveal this Text or Code Snippet]]

Error Output

The stack trace mirrors the error message indicating a premature closure of the content-length stream.

The Solution: Accessing Object Metadata Correctly

If your primary interest is simply to retrieve the object's metadata (like the last modified date), there’s a more efficient approach. Instead of fetching the entire object and then trying to manage the stream, you can bypass this unnecessary complication by directly accessing the metadata.

Step-by-Step Resolution

Use getObjectMetadata() Instead of getObject():

The getObjectMetadata() method allows you to retrieve metadata without the overhead of unnecessary data transfer.

Update Your Java Code:
Here’s a revised version of your code:

[[See Video to Reveal this Text or Code Snippet]]

Key Benefits of this Approach

Efficiency: Fetching only the metadata reduces bandwidth usage and results in faster execution.

Clarity: The code is simpler and easier to understand, focusing directly on the objective of obtaining metadata.

Error Prevention: Eliminating unnecessary stream reads helps avoid issues related to prematurely closing streams.

Conclusion

By redirecting your code to directly retrieve metadata with the getObjectMetadata() method, you can avoid the pitfalls of stream management, resulting in a clearer, more efficient approach to interacting with Amazon S3. This solution not only resolves the Premature end of Content-Length delimited message body issue but also enhances your application's performance overall.

Now, you can confidently manage your S3 objects without running into frustrating errors. Happy coding!