gradle jacoco plugin not generate exec files - gradle

Question

I've done gradle migration from gradle 3.5 to gradle 4.6. After migration exec files have stopped generated. '/build' folder doesn't contain 'jacoco' folder.
If I run gradle command with -- debug it writes in log :
[org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter]
Skipping task ':common:jacocoTestReport' as task onlyIf is false.
Here is part of gradle script:
subprojects {
apply plugin: 'java'
apply plugin: 'jacoco'
apply plugin: 'idea'
...
jacocoTestReport {
reports {
xml.enabled true
csv.enabled false
}
afterEvaluate {
classDirectories = files(classDirectories.files.collect {
fileTree(dir: it,
exclude: ['**/dto/**', '**/endpoint/**','**/enpoints/**', '**/spring/**',
'**/servlet/**','**/handler/**', '**/jpa/**', '**/filter/**', '**/events/**', '**/dao/**',
'**/exception/**', '**/http/**', '**/jdbc/**', '**/bigquery/**', '**/enums/**',
'**/repository/**', '**/combination/**', '**/datastore/**', '**/cassandra/**',
'**/google/**', '**/exceptions/**', '**/logging/**', '**/JavaGeneratedContext.java', '**/Q*.java'])
})
}
}
test {
enabled = !skipTests
allJvmArgs = [
'-Dfile.encoding=utf-8'
]
useJUnit {
excludeCategories 'com.severn.common.test.IntegrationTest'
}
/*jacoco {
enabled = true
destinationFile = file("$buildDir/jacoco/jacocoTest.exec")
}*/
finalizedBy jacocoTestReport
}
...
}

Answer 1

Make sure:
1) Your debug info is enabled during compile in your top level Gradle file (allprojects { ... } ). See here for more info: Jacoco Unit and Integration Tests coverage - individual and overall
tasks.withType(Compile) {
options.debug = true
options.compilerArgs = ["-g"]
}
2) Try removing the whole Jacoco configuration from the test task (make sure you place the .exec file if generated in the default location where jacocoTestReport task expects it). Make sure test task is running (and not getting excluded somehow). For testing purpose (to narrow down this .exec not getting created issue), you can force jacocoTestReport task to dependOn test task.
tasks.withType(Test) {enabled = true}
3) See latest Gradle 4.6 bundle (tar/zip) for Jacoco examples for a Java single/multi level project to get hint.
PS: Default JaCoCo version upgraded to 0.8.0 See if forcing this version within jacoco block helps.
https://docs.gradle.org/4.6/release-notes.html
The JaCoCo plugin has been upgraded to use JaCoCo version 0.8.0 by default.