Build should be successful even if Gradle is using JDK 16:
The problem could be that the tests are being run with the wrong JDK.
$ ./gradlew build -Dorg.gradle.java.home=/usr/lib/jvm/java-16-openjdk-amd64
FAILURE: Build failed with an exception.
* What went wrong:
java.lang.UnsupportedClassVersionError: wolkenschloss/TestbedPlugin has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 60.0
> wolkenschloss/TestbedPlugin has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 60.0
* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 5s
15 actionable tasks: 15 up-to-date
Build should be successful even if Gradle is using JDK 16:
The problem could be that the tests are being run with the wrong JDK.