# JVMByteSwapTool

**Repository Path**: dantefung/JVMByteSwapTool

## Basic Information

- **Project Name**: JVMByteSwapTool
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 1
- **Created**: 2024-09-30
- **Last Updated**: 2025-08-12

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# JVM ByteSwap Tool
![logo](sw-ico.png)

![actions](https://github.com/sunwu51/JVMByteSwapTool/actions/workflows/main.yml/badge.svg)

A tool that can hot swap the class byte code while jvm is running. Very suitable for `SpringBoot framework`.

Based on the jvm instrumentation tech, ASM, javassist and JVMTI.

# Usage
Download the zip file from the [release](https://github.com/sunwu51/JVMByteSwapTool/releases) page.

Make sure you have a JDK >= 1.8.
```bash
$ java -jar swapper.jar

// All of the java processes will be listed in following
// Choose the pid you want to attach
// Then a web ui will be served at http://localhost:8000
```

Visit this url `http://localhost:8000` then you will get the following Web UI.

If you want to change the http server port or web socket port:
```bash
$ java -jar -Dw_http_port=9999 -Dw_ws_port_19999 swapper.jar
```

![image](https://i.imgur.com/WSKkrxX.png)

Now you can enjoy the functionalities of swapper tool. 

For example, `Watch` some methods. Trigger this method, and then the params and return value and execution time cost will be printed. 

![image](https://i.imgur.com/RaEZ1w5.png)

It's `Watch` one of the functions provided by swapper tool.

Get more functions and details from the [wiki](https://github.com/sunwu51/JVMByteSwapTool/wiki).