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GraalVM is a bundle of different technologies. Among them is SubstrateVM: it allows transforming a JAR (or a class) into a native executable. You can then wrap the resulting application into a Docker container, which must be compatible with one's FaaS framework of choice. Here's one example of such an approach.
Some time ago, I read a post describing how to run a serverless Kotlin function on OpenFaaS. While the content is technically correct, I believe the concept itself is very wrong. Such posts can lead people to make ill-advised decisions: "because we can" is hardly a winning strategy. in this post, I'd like to first explain why the JVM platform is a bad idea for FaaS. Then, I'll proceed to propose alternatives to use Kotlin nonetheless.