Wukong - Java Toolchain with Rust

Wukong is a Java toolchain written with Rust.

Why write Java toolchain with Rust?

• startup time matter: Rust is fast, and Java takes ages to start.
• No environment dependencies: No need to install JDK, Maven, Gradle, etc.
• Binary file size matter: small size, easy to distribute. GraalVM native-image is not small enough.

Get started

• Install: cargo binstall wukong. Please run cargo install cargo-binstall first.
• JBang-rs: ~/.cargo/bin/jbang --version
• SDKMAN-rs: ~/.cargo/bin/sdk --version
• jenv-rs: ~/.cargo/bin/jenv --version
• Maven Toolchains: ~/.cargo/bin/mt --version

Java Toolchains

• JBang(Java): https://www.jbang.dev/
• SDKMAN(bash): https://sdkman.io/
• jenv(bash): https://github.com/jenv/jenv
• Maven Toolchains CLI: https://maven.apache.org/guides/mini/guide-using-toolchains.html

SDKMAN-rs

Please add eval $(~/.cargo/bin/sdk init) to your shell profile.

enhancements

• CI friendly: sdk install -y java for auto-install
• Silent mode: sdk -q install java
• Major version support(Temurin by default): sdk install java 17, sdk use java 17

Difference

• use version: eval $(sdk use java 17)

Maven Toolchains CLI

• jdks: list all installed JDKs
• vendors: list all vendors and available JDK versions.
• list: list JDKs from ~/.m2/toolchains.xml
• add: add JDK into ~/.m2/toolchains.xml
• remove: remove JDK from ~/.m2/toolchains.xml

Add JDK

• list all vendors and jdk versions: mt vendors
• mt add 21: add JDK 21 from $HOME/.jbang/cache/jdks/21
• mt add 17.0.4-tem: add JDK from $HOME/.sdk/candidates/java/17.0.4-tem
• mt add /path/to/java-home: add JDK from /path/to/java-home

direnv integration

Integration with direnv by sdk direnv init:

• Java Home: .java-version, .sdkmanrc
• Aut candidate home and path for SDKMAN: .sdkmanrc

References

• SDKMAN CLI: SDKMAN CLI Native with Rust
• OneIO: all-in-one convenient IO library for Rust
• startup-time: Measure startup time of different programming languages