How to Efficiently Upload Large Files Using Java's Apache HttpAsyncClient

Discover a solution for uploading large files in Java using `Apache HttpAsyncClient` without running into memory issues.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Java-Apache BufferedHttpEntity loads whole file when sending the request

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Efficiently Upload Large Files Using Java's Apache HttpAsyncClient

Let’s dive into the core issue and explore an efficient solution to this problem.

Problem Overview

When implementing a file upload using the CloseableHttpAsyncClient, you might find that loading whole files into memory (as is typical with the BufferedHttpEntity) can cause drastic memory consumption, pushing your application to exceed its heap space limits. Here are two common scenarios you may have faced:

Memory Overflow: Your application grows exponentially in memory usage when you try to upload large files due to buffering of the entire file.

Content Length Issues: You face content length errors when conditions do not allow for proper streaming of the file during upload.

These challenges make uploading large files not only frustrating but also technically challenging.

Solution Breakdown

To address these problems effectively, consider switching from HttpAsyncClient to a more suitable approach using CloseableHttpClient. Here’s a comprehensive solution:

Step 1: Use CloseableHttpClient and RequestBuilder

Instead of using the asynchronous approach which can load files in memory, switch to a blocking execution context.

Set Up Multipart Builder: Create a MultipartEntityBuilder.

Add File Part: Use FileBody to handle the file.

Set Up the Post Request: Utilize the RequestBuilder to configure your multipart request.

Code Example

Here is how you can implement these changes:

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

Step 2: Execute Request

Conclusion

By implementing this systematic approach using CloseableHttpClient, you can upload large files much more efficiently while preventing memory overflow issues. This solution not only resolves the memory concerns but also gives you greater control over the uploading process.

If you are facing challenges with large file uploads in Java, remember this method for a smoother experience!