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KeenWrite
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OpenJ9
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Graal
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InfluxDB
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I think the entirety of Hotspot is written in C++ [0]? The standard library in the JDK is mostly written in Java, but the VM itself with the GC and JIT code is in C++, which makes sense as the GC would have to collect itself.
If you do not count the standard library as part of the JVM (but part of the JDK), then the JVM is written mostly in C++.
[0]: https://github.com/openjdk/jdk/tree/master/src/hotspot
It'll help build cross-platform desktop applications. In theory, it'll mean hooking the build process up to a GitHub action to build platform-specific binaries, such as my FOSS KeenWrite Markdown editor[0], without having to have a copy of every operating system.
To my knowledge, cross-compiling "native" Linux and Windows binaries using Java requires duct tape, chewing gum, and warp-packer.[1]
GraalVM isn't a panacea, though.[2] For example, GraalVM cannot compile Renjin, a pure Java R interpreter, so you have to switch from Renjin to FastR. Switching isn't trivial.
[0]: https://github.com/DaveJarvis/keenwrite
[1]: https://dave.autonoma.ca/blog/2020/06/29/write-once-build-an...
[2]: https://github.com/bedatadriven/renjin/issues/564
It'll help build cross-platform desktop applications. In theory, it'll mean hooking the build process up to a GitHub action to build platform-specific binaries, such as my FOSS KeenWrite Markdown editor[0], without having to have a copy of every operating system.
To my knowledge, cross-compiling "native" Linux and Windows binaries using Java requires duct tape, chewing gum, and warp-packer.[1]
GraalVM isn't a panacea, though.[2] For example, GraalVM cannot compile Renjin, a pure Java R interpreter, so you have to switch from Renjin to FastR. Switching isn't trivial.
[0]: https://github.com/DaveJarvis/keenwrite
[1]: https://dave.autonoma.ca/blog/2020/06/29/write-once-build-an...
[2]: https://github.com/bedatadriven/renjin/issues/564
I keep forgetting about J9 but they're not doing themselves any branding favors since there actually is J17 on J9 :-/ https://github.com/eclipse-openj9/openj9/blob/openj9-0.35.0/... (Also that 0.35 versioning ...)
As best I can tell, these are the docker images: https://hub.docker.com/_/ibm-semeru-runtimes
$ docker run --rm ibm-semeru-runtimes:open-11-jdk java -version
I'm actually wanting to do this with Graal at the moment ("using GitHub Actions to produce platform-specific binaries")
As far as I can tell Graal does not have cross-compilation ability currently (there is an open issue here: https://github.com/oracle/graal/issues/407)