Thanks, i suppose it`s all ok with java java -version openjdk version "13.0.7" 2021-04-20 OpenJDK Runtime Environment (build 13.0.7+5-Ubuntu-0ubuntu120.04) OpenJDK 64-Bit Server VM (build 13.0.7+5-Ubuntu-0ubuntu120.04, mixed mode)
and not ok with: build.gradle.kts ''' val werror by props(true) ... if (werror) { options.compilerArgs.add("-Werror") } '''
What is the exact Java version you are using? It looks like https://bugs.openjdk.java.net/browse/JDK-8032211 , and it might be that newer OpenJDK include the fix. Vladimir