hiyouka/classpy

GUI tool for investigating Java class files

Classpy

Classpy is a GUI tool for investigating Java class file, Lua binary chunk, Wasm binary code, and other binary file formats.

Inspiration

This tool is mainly inspired by javap and JavaClassViewer. I reinvent the wheel for the following two reasons:

1. Learn Java class file format and bytecode through parsing it
2. Try JavaFX 8

Features

• Understands class files described by JVMS9
• Supports Lua 5.3 binary chunk format
• Supports Wasm binary format
• Supports Bitcoin raw block and transaction format
• Displays parsed binary file as tree and hex text
• The corresponding hex text is highlighted when you select a tree node

Quick Start

Just for macos with brew

• Install

brew tap guxingke/repo && brew install classpy

• Try
  • open default gui window

  classpy

  • open gui window with args

  echo "public class HelloWorld { public static void main(String[] args) { System.out.println(\"Hello World\"); } }" > HelloWorld.java
  $JAVA_HOME/bin/javac HelloWorld.java
  
  classpy HelloWorld.class

Build

cd path/to/classpy
./gradlew uberjar

Run

cd path/to/classpy
./gradlew run

Screenshots