Mastering Arthas Redefine: Live Java Class Hot‑Update Made Simple

This article explains how Arthas's redefine command enables hot‑updating of Java classes at runtime, outlines scenarios where redefinition fails, offers tips for uploading compiled .class files, and provides a concrete code example demonstrating the process.

ArthasDebuggingHot Update

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Mastering Arthas Redefine: Live Java Class Hot‑Update Made Simple

Programmer DD

Feb 18, 2020 · Backend Development

How to Hot‑Update Java Code in Production Using Arthas

This tutorial demonstrates how to use Alibaba's open‑source Java diagnostic tool Arthas to decompile, modify, and hot‑replace a running class in a production environment, covering the jad, mc, and redefine commands, practical steps, and common pitfalls.

ArthasDebuggingHot Update

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How to Hot‑Update Java Code in Production Using Arthas