GraalVM for JDK 21 is here

This page summarizes the projects mentioned and recommended in the original post on news.ycombinator.com
Graalvm Command-line Argument Parsers Java Ruby CommandLine

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  • graalvm-reachability-metadata

    Repository which contains community-driven collection of GraalVM reachability metadata for open-source libraries.

    • gcj had a lot of problems beyond needing configuration of reflection metadata. It used a full reimplementation of the standard library, and it was never adopted by the wider Java community being largely just Red Hat's strategy for creating a fully open source Java implementation rather than something offering specific benefits to Java developers. In particular people thought it'd lead to faster code, but GCC was never designed for Java and the results were actually a fair bit slower iirc.

    Native image is quite different. With this new release the compiled images can not only be faster than JIT compiled Java (wow) but also use way less memory and start instantly. At a stroke this is resolving one of the biggest complaints people have always had against JVM languages.

    And as a consequence you're seeing adoption by the wider community. All the modern Java web frameworks support it now, and there's a metadata repository where it's collected for projects that haven't accepted it upstream yet [1].

    [1] https://github.com/oracle/graalvm-reachability-metadata

  • picocli

    Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps can include as source & avoid adding a dependency. Written in Java, usable from Groovy, Kotlin, Scala, etc.

    • Picocli allows using a compiler annotation processor to generate classes at compile time instead [0].

    [0]: https://github.com/remkop/picocli/blob/main/picocli-codegen/...

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  • truffleruby

    A high performance implementation of the Ruby programming language, built on GraalVM.

    • GitHub page has some info: https://github.com/oracle/truffleruby#current-status

    My question is, how viable is TruffleRuby vs JRuby?

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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