build errors with gradle 7.0

[javawriter]

I use gradle 7.0 to build this and I got tons of errors. Lots of error message about compatibility issues with gradle 7.0.

[proppy]

Gradle wrapper uses 6.0.1:
https://github.com/actions-on-google/smart-home-java/blob/master/gradle/wrapper/gradle-wrapper.properties#L3

Can you report which kind of error you get with gradle 7.0?