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Not sure if that's really the problem here, but Gradle 6.6 is too old to be compatible with Java 17: https://docs.gradle.org/current/userguide/compatibility.html

I think so too, how do i upgrade it?

I, for one, would first downgrade to Java 11 to get the project building. Then possibly update things bit by bit (Gradle, plugins, other dependencies, etc.)

i changed

distributionUrl

to point to gradle 7.3, and so far so good. will test in more detail to be sure