HotSeconds: A Java Remote Hot‑Deployment Plugin for Faster Development

In this article the author introduces HotSeconds , a Java remote hot‑deployment plugin (also usable for local hot‑deployment) consisting of HotSecondsServer and HotSecondsClient , which can boost deployment efficiency by up to a hundred times compared with traditional methods.

Feature demonstration includes:

1. Hot‑deploy code

The plugin supports modifying existing code, adding fields, methods, or classes, overcoming the limitation of the native JDK Instrument API that only allows method‑body changes. It also hot‑updates common frameworks such as Spring (adding @Autowired fields) and Spring MVC (adding controller methods).

Example: hot‑deploy a new Spring MVC field and method.

2. Hot‑deploy resource files

Demonstrates hot‑deployment of a MyBatis XML file directly via right‑click.

3. Batch hot‑update of modified files

When multiple files are changed, the hot‑deployment panel can push all modifications to the server, supporting timestamp‑based deployment or deploying uncommitted files from version control (Git/SVN).

4. Remote function execution

Without calling HTTP or RPC interfaces, developers can right‑click a function and trigger its execution, useful for debugging or fixing dirty data in sandbox environments. Four cases are supported: static vs. non‑static, with or without parameters.

Parameter types currently supported are byte , short , boolean , char , int , double , float , long , and Bigdecimal . Complex parameters can be handled by creating a static no‑arg function and hot‑deploying its class.

5. Remote field value inspection

Both static and instance fields can be inspected by right‑clicking the field; for instance fields a dialog shows all object instances to select from.

Installation instructions are available at the GitHub repository https://github.com/Liubsyy/HotSecondsIDEA .

The article concludes with a call to share the content and join the architecture community for further learning.