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~/.gradle/caches/jars-9

are some build logic instrumented jars while

/.gradle/caches/modules-2

are dependencies. I doubt there is any documentation for jars-9.

hm. Can you elaborate on the "instrumented" part?

For example for configuration cache Gradle has to detect the

System.getProperty()

in the build logic. So there are some transformations on the build logic so that is possible and result jars are cached in these folders.

interesting! Thanks