The only sensible thing to do in kotlin

theonlysensiblething.kt

import com.tngtech.archunit.base.DescribedPredicate
import com.tngtech.archunit.core.domain.JavaClass
import com.tngtech.archunit.core.importer.ClassFileImporter
import com.tngtech.archunit.lang.ArchCondition
import com.tngtech.archunit.lang.ConditionEvents
import com.tngtech.archunit.lang.SimpleConditionEvent
import com.tngtech.archunit.lang.syntax.ArchRuleDefinition.classes
import org.junit.jupiter.api.Test
import org.springframework.stereotype.Component
import org.springframework.stereotype.Service

class ArchTest {

    companion object {
        private val importedClasses =
            ClassFileImporter().importPackagesOf(ArchTest::class.java)!!
    }

    @Test
    fun `inheritance is prohibited!`() {
        classes().that()

            .areAnnotatedWith(Component::class.java)
            .or()
            .areAnnotatedWith(Service::class.java)
            .or(isDataClass())
            
            .should(haveNoSuperclass())
            
            .check(importedClasses)
    }

    private fun isDataClass() = IsDataClass()

    private fun haveNoSuperclass() = HaveNoSuperclass()

    private class IsDataClass : DescribedPredicate<JavaClass>("is data class") {
        override fun apply(input: JavaClass): Boolean {
            return try {
                input.reflect().kotlin.isData
            } catch (e: Throwable) {
                false
            }
        }
    }

    private class HaveNoSuperclass : ArchCondition<JavaClass>("have no superclass") {
        override fun check(javaClass: JavaClass, events: ConditionEvents) {
            var isOk = true
            var violationClass = "java.lang.Object"
            if (javaClass.superclass.isPresent) {
                if (javaClass.superclass.get().name != "java.lang.Object") {
                    isOk = false
                    violationClass = javaClass.superclass.get().name
                }
            }
            events.add(SimpleConditionEvent(javaClass, isOk, "${javaClass.name} inherits $violationClass"))
        }
    }
}