Kotlin generates additional classes when using reflection. These classes are neither marked as covered nor filtered out by jacoco.

Steps to reproduce

Add maven dependency

        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-reflect</artifactId>
            <version>${kotlin.version}</version>
        </dependency>

and create a function which gets a reflect.Method reference to a function like this:

fun minimalFunction() {
    // this will make jacoco fail due to a class generated by kotlin
    ::minimalFunction.javaMethod
}

when using .javaMethod, Kotlin generates an anonymous class which will be checked for line coverage by jacoco

JaCoCo version: 0.8.2
Operating system: any (tested on Mac OS 10.13.6 and Ubuntu)
Tool integration: Maven

Expected behaviour

Code generated by Kotlin compiler should be marked as covered or filtered out

Actual behaviour

Line coverage for generated class is 0.00
Rule violated for class SomeController.getAddressWithGeoInformation.javaMethod.1: lines covered ratio is 0.00, but expected minimum is 0.85

This issue may or may not affect other reflection mechanisms as well. I tested only .javaMethod as we use this for generating HATEOAS links in our web controller classes.