https://github.com/mrjameshamilton/jep457-hello-world

A JEP 457 Class-File API Hello World example
https://github.com/mrjameshamilton/jep457-hello-world

bytecode classfile java jep457 jvm

Last synced: about 6 hours ago
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A JEP 457 Class-File API Hello World example

• Host: GitHub
• URL: https://github.com/mrjameshamilton/jep457-hello-world
• Owner: mrjameshamilton
• License: mit
• Created: 2023-10-03T19:56:36.000Z (about 1 year ago)
• Default Branch: master
• Last Pushed: 2024-01-21T08:43:57.000Z (10 months ago)
• Last Synced: 2024-01-21T11:28:06.930Z (10 months ago)
• Topics: bytecode, classfile, java, jep457, jvm
• Language: Java
• Homepage:
• Size: 9.77 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# JEP457 Hello World

[JEP 457 Class-File API](https://openjdk.org/jeps/457) is a preview API to provide a standard API for parsing, 

generating, and transforming Java class files.

The example here shows how easy it is to use to create a 

new class that prints "Hello World".

https://github.com/mrjameshamilton/jep457-hello-world/blob/ea854cda0e058d728630af907f9ed715d9a081ca/Main.java#L14-L19

# Building

You'll need JDK 22 and easiest way to install this on Linux is with [SDK man](https://sdkman.io/):

```shell

sdk install java 22-open

```

If you have Java 22, you can then execute the `run.sh` script which will

compile and execute `Main.java`. `Main` will create a Java class `HelloWorld.class`

which will then be executed.

```shell

$ ./run.sh

```

# Similar projects

There are many similar projects for parsing,

generating, and transforming Java class files, including:

* [ASM](https://asm.ow2.io/)

* [ProGuardCORE](https://github.com/Guardsquare/proguard-core)

* [ByteBuddy](https://bytebuddy.net/#/)