Right now it looks like there’s 2 options for a native M1 JDK:
Microsoft have JDK 17 builds for Windows, Linux and MacOS on x86, ARM64, and Apple M1:
Azul have OpenJDK builds also for Windows, Linux and MacOS, also for x64 and ARM:
I’ll probably download both to take them for a spin, but first up, Azul OpenJDK for M1.