RecursiveAction cannot be resolved to a type

When I add jdk17.0.2 to my build path, in STS(eclipse), replacing 15, RecursiveAction cannot be resolved to a type. What gives? I know java.util.concurrent.RecursiveAction was not removed from the jdk. Reverting back to 15 solves it.

Solution

This ceased to be a problem, which suggests problems with the IDE(STS).

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