Gradle Java 10 test task fails

[Sverre Moe]

I have a Java 10 modular application, building with Gradle and using JaCoCo.

Version 0.8.0 ca0me with official support for Java 9, and I am using version 0.8.1 which supports Java 10.

Download https://repo.maven.apache.org/maven2/org/jacoco/org.jacoco.agent/0.8.1/org.jacoco.agent-0.8.1.pom

Download https://repo.maven.apache.org/maven2/org/jacoco/org.jacoco.build/0.8.1/org.jacoco.build-0.8.1.pom

Download https://repo.maven.apache.org/maven2/org/jacoco/org.jacoco.agent/0.8.1/org.jacoco.agent-0.8.1.jar

> Task :test FAILED

java.lang.NoClassDefFoundError: jdk/internal/reflect/GeneratedSerializationConstructorAccessor1

        at jdk.internal.reflect.GeneratedSerializationConstructorAccessor1.newInstance(Unknown Source)

        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)

        at java.base/java.io.ObjectStreamClass.newInstance(ObjectStreamClass.java:1081)

        at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2062)

        at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1585)

        at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)

        at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:107)

        at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:64)

        at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:62)

        at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:67)

Caused by: java.lang.ClassNotFoundException: jdk.internal.reflect.GeneratedSerializationConstructorAccessor1

        at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:466)

        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:566)

        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)

        ... 10 more

<===========--> 88% EXECUTING [24s]

> IDLE

My gradle jacoco

/* JaCoCo configuration */
jacoco {
    toolVersion = "0.8.1"
}

jacocoTestReport {
    reports {
        xml.enabled true
        html.enabled true
    }
}

test {
    useJUnitPlatform()

    doFirst {
        jvmArgs = [
            '--module-path', classpath.asPath
        ]
    }

    jacoco {
        append = true
        def jacocoExec = buildDir.name + "/jacoco/jacoco.exec"
        destinationFile = file(jacocoExec)
        includeNoLocationClasses = true
    }
}

[Evgeny Mandrikov]

Hi,

Please have a look at https://github.com/jacoco/jacoco/issues/16#issuecomment-351943050 , which describes that

if you use "includeNoLocationClasses = true" with JDK >= 9 , then you also need "excludeClassLoaders = [ 'jdk.internal.reflect.DelegatingClassLoader' ]"

Why do you need "includeNoLocationClasses = true" ?

P.S. why not be polite and start conversation with "hi" ?

[Sverre Moe]

Hi,

I don't need "includeNoLocationClasses = true", I thinkg. It was just a copy-paste configuration I found to use JaCoCo with Gradle.
Building works fine when I remove it.

[Sverre Moe]

Seems I could shape off even more of the configuration, removing redundant code.

Under jacoco/toolVersion

I guess it will always use the latest tool version. So setting this would not be necessary unless one needs to guarantee a specific version.

Under jacocoTestReport/reports

No need for html.enabled=true, as it is default.

Would be great if XML also was default, but I guess cannot accommodate everyone.

Under test/jacoco

No need for append=true, as it is default.

I could see no reason to set destinationFile. unless one really needed it to a specific file name, but I don't see why.

The only remaining JaCoCo in my build.gradle;

jacocoTestReport {
    reports {
        xml.enabled true
    }
}