Using ArthasHotSwap for Fast Hot Updates in Java Backend Development

We share a very useful hot‑update plugin called ArthasHotSwap (GitHub: https://github.com/xxxtai/ArthasHotSwap) that allows developers to modify Java classes on the fly without a full redeployment.

When developing and debugging in a test environment, it is common to need hot‑updates for a few files. For example, changing a name from "Zhang San" to "Li Si" would normally require rebuilding and redeploying the whole application, which can take several minutes.

Using ArthasHotSwap , the process becomes simple: download the plugin, modify the source code, compile it to obtain the updated .class files, and then invoke the plugin.

The plugin uploads the modified bytecode to an OSS bucket; the target server downloads the bytecode and applies the hot update automatically. If you need to customize the object storage, refer to the author's GitHub issue for guidance.

After applying the plugin on the server and pasting the updated files, the changes take effect instantly. The following screenshots illustrate the process and the successful result:

Finally, we can see that the modification succeeded; the whole process took less than ten seconds, making it an efficiency‑boosting tool for backend developers.