The toolchain is implemented entirely in Rust, focusing on performance and developer experience. Its UX is inspired by Python’s modern package manager uv, aiming for fast, intuitive, and clean CLI workflows.

The CLI ships as a cross-platform bundle with the stdlib baked in, auto-detects local JDK toolchains, and lets you override entrypoints for custom workflows.

On the language side, I’ve added generic function signatures, record component access, optional parentheses on zero-arg calls, richer string interpolation, and a smarter sequence pipeline that preserves element types.

Under the hood, a new Rowan-based front-end drives improved lowering so that when/switch expressions, range patterns, and inferred signatures compile cleanly to Java.

Feedback and questions welcome. More details → https://project-jvlang.github.io/en/ and https://github.com/project-jvlang/jv-lang