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interesting, the build no longer fails when I use

processIsolation()

instead

that's curious. I just printed out

((URLClassLoader)getClass().getClassLoader()).getURLs()

in a simple plugin that I have. the top-level classloader has is no differences between

classLoaderIsolation

and

processIsolation

, containing what I set in the spec

classpath

and my plugin, and the parents of each are identical (up to re-ordering), containing just Gradle and its dependencies.

this is a more complex project, but I was also surprised at the number of classloaders involved