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If I understand the README correctly, CRaC in an abstract API that delegates to an implementation (CRIU) which is Linux-specific, described in its README as "the never-ending story, because we have to always keep up with the Linux kernel".

So this wouldn't help if I'm deploying a GUI app for Windows, for example.

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Correct, it might, someday, become part of Java SE. If that ever happens I would expect it working on every platform Java supports would be a prerequisite for that.

Right now it's primarily useful for reducing start up times in AWS Lambdas and auto-scaling workloads.

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