Unable to Exclude io.github.oshai.kotlinlogging Classes from Coverage in Kover 0.9.0

[andreigcraciun]

Body:
Hello Kover team,

I’m currently using the kover-maven-plugin (version 0.9.0) and having trouble excluding certain classes/packages from my coverage reports. Specifically, I would like to exclude all classes under the io.github.oshai.kotlinlogging package, as I don’t want my logging code to affect coverage metrics.

private val logger = KotlinLogging.logger {}

What I’ve Tried:
1. Configuring in the plugin configuration to include io.github.oshai.kotlinlogging.**.
2. Trying various patterns and even specifying classes like io.github.oshai.kotlinlogging.KotlinLogging.
3. Running mvn clean verify after each change to ensure changes are picked up.

Despite these attempts, the coverage reports still show the logging classes as partially covered. I’ve reviewed the documentation and previous issues but haven’t found a working solution.

Environment:
• Maven version: 3.9.9
• JDK version: 17
• Kotlin version: 1.9.25
• Kover plugin version: 0.9.0

Questions:
1. Is there a known issue with excluding certain classes or packages in version 0.9.0?
2. Are there recommended patterns or configurations that reliably exclude packages like io.github.oshai.kotlinlogging?

Any guidance or examples would be greatly appreciated. Thank you for your time and help!

[shanshin]

Hi,
could you please provide maven configuration with which you performed the filtering

1. Configuring in the plugin configuration to include io.github.oshai.kotlinlogging.**.

[andreigcraciun]

<plugins>
                    <plugin>
                        <groupId>org.jetbrains.kotlinx</groupId>
                        <artifactId>kover-maven-plugin</artifactId>
                        <version>0.9.0</version>
                        <configuration>
                            <filters>
                                <excludes>
                                    <classes>
                                        <class>io.github.oshai.kotlinlogging.**</class>
                                    </classes>
                                </excludes>
                            </filters>
                        </configuration>
                        <executions>
                            <!-- instrument test tasks -->
                            <execution>
                                <id>instr</id>
                                <goals>
                                    <goal>instrumentation</goal>
                                </goals>
                            </execution>

                            <!-- generate XML report in verify phase -->
                            <execution>
                                <id>kover-xml</id>
                                <goals>
                                    <goal>report-xml</goal>
                                </goals>
                            </execution>

                            <!-- generate HTML report in verify phase -->
                            <execution>
                                <id>kover-html</id>
                                <goals>
                                    <goal>report-html</goal>
                                </goals>
                            </execution>

                            <!-- check coverage rules in verify phase -->
                            <execution>
                                <id>kover-verify</id>
                                <goals>
                                    <goal>verify</goal>
                                </goals>
                            </execution>

                            <!-- generate IC report -->
                            <execution>
                                <id>kover-ic</id>
                                <goals>
                                    <goal>report-ic</goal>
                                </goals>
                            </execution>

                            <!-- print coverage values to the log -->
                            <execution>
                                <id>kover-log</id>
                                <goals>
                                    <goal>log</goal>
                                </goals>
                            </execution>
                        </executions>
                    </plugin>

[shanshin]

Is changing

                        <configuration>
                            <filters>
                                <excludes>
                                    <classes>
                                        <class>io.github.oshai.kotlinlogging.**</class>
                                    </classes>
                                </excludes>
                            </filters>
                        </configuration>

to

                        <configuration>
                            <filters>
                                <excludes>
                                    <classes>io.github.oshai.kotlinlogging.*</classes>
                                </excludes>
                            </filters>
                        </configuration>

helps?

[andreigcraciun]

Ty for your response! But unfortunately it doesn't help. I want to mention that private val logger = KotlinLogging.logger {} is coming from io.github.oshai.kotlinlogging which is an external library. No idea if it matters or not. But whatever I do I can't get 100% coverage because the line val logger = KotlinLogging.logger {} is being market with yellow meaning it's not covered. I am opened to any suggestions.

[shanshin]

Could you provide a small reproducer project?

[andreigcraciun]

Sure, thank you so much for your help.

https://github.com/andreigcraciun/kover-kotlinlogging

[shanshin]

As far as I can see, the classes from the io.github.oshai.kotlinlogging package are not present in the report.

Could you clarify what you mean by I would like to exclude all classes under the io.github.oshai.kotlinlogging package?

[andreigcraciun]

yes, its not present in the report by itself. but inside digital.cariad.logger -> inside [TestLogger] -> line private val logger = KotlinLogging.logger {} ( which is the class from io.github.oshai.kotlinlogging package ) is not excluded from report. I would love to achieve 100% coverage and I don't know how to exclude that line from the report.

[shanshin]

The exclusion works on the classes in which the code is called, but not for the classes used (because it is important in which class the executable code was written, and this line is written in the TestLogger class).

In any case, even if you exclude line private val logger = KotlinLogging.logger {}, the constructor of the TestLogger class will remain uncovered (because they work at the same time) - therefore, it is easier to exclude the entire class TestLogger.

[andreigcraciun]

it is easier to exclude the entire class TestLogger

I understand but because we are talking about a logger, which is present in my whole application, it means I will have to exclude so many classes that it doesn't make sense to generate the report anymore.

What should I do in order to achieve 100% coverage?

[shanshin]

You can exclude lambda for all logger methods by filter like this:

                <configuration>
                    <filters>
                        <excludes>
                            <classes>*$logger$1</classes>
                        </excludes>
                    </filters>
                </configuration>

[andreigcraciun]

Thank you for all your help! It was exactly what I looking for! Many thanks <3 !

[andreigcraciun]

We can close this!