Help with GraalVM auto-detection wrt Afterburner/Blackbird

[Tatu Saloranta]

Quick "Bat signal" style request for help with GraalVM: I think we
have some devs here who are somewhat familiar with GraalVM runtime,
and I was hoping to get some help with this issue:

https://github.com/FasterXML/jackson-modules-base/issues/191

where basically it'd be good to auto-detect, if possible, whether the
current runtime environment is GraalVM.

Knowing this would let modules like Afterburner and Blackbird
gracefully degrade: instead of failing, just avoiding attempts to do
dynamic bytecode generation when that will not succeed.
This would be useful for users who might not want to customize setup
across Graal/non-Graal cases, or frameworks, so that they can register
AB/BB without causing failures.

-+ Tatu +-

[Paulo Lopes]

Hi,

In es4x I had to do a similar check without relying on GraalVM classes, this works for me:

https://github.com/reactiverse/es4x/blob/develop/pm/src/main/java/io/reactiverse/es4x/cli/GraalVMVersion.java

You probably don't need all that the functionality, just the boolean GRAALVM

Cheers,

Paulo

[Joo Hyuk Kim]

Thank you for sharing your use case @PauloLopes 👍🏻 

Quite straightforward.

If it's possible we might want to avoid hard-coding the "graalvm", though I can't think of other option yet 🤔

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[Tatu Saloranta]

Thanks!

And fwtw, jackson-databind already had some support that I had forgotten about:

https://github.com/FasterXML/jackson-databind/blob/2.16/src/main/java/com/fasterxml/jackson/databind/util/NativeImageUtil.java

-+ Tatu +-