migrate a codebase from java to kotlin

AbstractTest.kt

@ActiveProfiles("test")
abstract class AbstractTest {
    @Rule
    val springMethodRule = SpringMethodRule()

    companion object {
        @ClassRule
        val SPRING_CLASS_RULE = SpringClassRule()
    }
}

org.junit.internal.runners.rules.ValidationError: The @Rule 'springMethodRule' must be public.

How to fix?
- add @JvmField (once your codebase has fully moved to kotlin, remove that annotation)

@ActiveProfiles("test")
abstract class AbstractIntegrationTestBase {
    @Rule @JvmField
    val springMethodRule = SpringMethodRule()
    companion object {
        @ClassRule @JvmField
        val SPRING_CLASS_RULE = SpringClassRule()
    }
}

migate-from-java-to-kotlin.txt

check the examples ...