Gradle jacoco coverage report with more than one submodule(s)?

Question

Does anybody know how to configure a gradle file for java jacoco report that contain codecoverage of more than one gradle submodule?

my current approach only shows codecoverage of the current submodule but not codecoverage of a sibling-submodul.

I have this project structure

- build.gradle (1)
- corelib/
    - build.gradle (2)
    - src/main/java/package/Core.java
- extlib/
    - build.gradle (3)
    - src/main/java/package/Ext.java
    - src/test/java/package/Integrationtest.java

when i execute gradlew :extlib:check :extlib:jacocoTestReport the junit-test "Integrationtest.java" is executed and a codecoverage report is generated that does not contain codecoverage for corelib classes like Core.java

The result should include the codecoverage of Ext.java and Core.java

I already read

• https://docs.gradle.org/current/userguide/jacoco_plugin.html
• and Filter JaCoCo coverage reports with Gradle

but found no clues

here is content of the gradle files

// root build.gradle (1)
// Top-level build file where you can add configuration options 
// common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.0'
    }
}
allprojects {
    repositories {
        jcenter()
    }
}

---

// build.gradle (2) subproject build file for corelib.
apply plugin: 'java'
apply plugin: 'jacoco'

dependencies {
}

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

---

// build.gradle (3) subproject build file for extlib.
apply plugin: 'java'
apply plugin: 'jacoco'

dependencies {
    compile project(':corelib')
    testCompile 'junit:junit:4.11'

    // this does not compile
    // jacocoTestReport project(':pixymeta-core-lib')
}

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

// workaround because android-studio does not make the test resources available
// see https://code.google.com/p/android/issues/detail?id=64887#c13
task copyTestResources(type: Copy) {
    from sourceSets.test.resources
    into sourceSets.test.output.classesDir
}
processTestResources.dependsOn copyTestResources

---

[Update 2016-08-01]

thanks to @Benjamin Muschko i also tried in the root gradle file

// https://discuss.gradle.org/t/merge-jacoco-coverage-reports-for-multiproject-setups/12100/6
// https://docs.gradle.org/current/dsl/org.gradle.testing.jacoco.tasks.JacocoMerge.html
task jacocoMerge(type: JacocoMerge) {
   subprojects.each { subproject ->
      executionData subproject.tasks.withType(Test)
   } 

}

but got error message (with gradle-2.14)

* What went wrong:
Some problems were found with the configuration of task ':jacocoMerge'.
> No value has been specified for property 'jacocoClasspath'.
> No value has been specified for property 'executionData'.
> No value has been specified for property 'destinationFile'.

---

there is also the gradle plugin https://github.com/paveldudka/JacocoEverywhere where i have asked for mulit-submodule support https://github.com/paveldudka/JacocoEverywhere/issues/16

[update 2016-08-01] i found a working solution based on https://github.com/palantir/gradle-jacoco-coverage

See my own answer below

Answer 1

This works for me

plugins {
    id 'org.kordamp.gradle.jacoco' version '0.43.0'
}

config {
    coverage {
        jacoco {
            enabled
            aggregateExecFile
            aggregateReportHtmlFile
            aggregateReportXmlFile
            additionalSourceDirs
            additionalClassDirs
        }
    }
}

https://kordamp.org/kordamp-gradle-plugins/#_org_kordamp_gradle_jacoco

Answer 2

Finally I found this plugin: https://github.com/palantir/gradle-jacoco-coverage that did the job for me:

root gradle.build

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        // see https://jcenter.bintray.com/com/android/tools/build/gradle/
        classpath 'com.android.tools.build:gradle:2.1.0'
        // classpath 'com.android.tools.build:gradle:2.2.0-alpha1'

        // https://github.com/palantir/gradle-jacoco-coverage
        classpath 'com.palantir:jacoco-coverage:0.4.0'      
    }
}

// https://github.com/palantir/gradle-jacoco-coverage
apply plugin: 'com.palantir.jacoco-full-report'

all subprojects that has

apply plugin: 'jacoco'

are included in the report.

Answer 3

One possible solution (with some sonar specific parts):

def getJacocoMergeTask(Project proj){
    def jmClosure =  {
        doFirst {
            logger.info "${path} started"
            executionData.each { ed ->
                logger.info "${path} data: ${ed}"
            }
        }
        onlyIf {
            executionData != null && !executionData.isEmpty()
        }
    }

    def jacocoMerge = null
    if(!proj.tasks.findByName('jacocoMerge')){

        jacocoMerge = proj.tasks.create('jacocoMerge', JacocoMerge.class)
        jacocoMerge.configure jmClosure

        // sonar specific part
        proj.rootProject.tasks["sonarqube"].mustRunAfter jacocoMerge

        proj.sonarqube {
            properties {
                property "sonar.jacoco.reportPaths", jacocoMerge.destinationFile.absolutePath
            }
        }
        // end of sonar specific part

        logger.info "${jacocoMerge.path} created"
    } else {
        jacocoMerge = proj.tasks["jacocoMerge"]
    }
    jacocoMerge
}


afterEvaluate { project ->
    def jacocoMerge = getJacocoMergeTask(project)

    project.tasks.withType(Test) { task ->
        logger.info "${jacocoMerge.path} cfg: ${task.path}"

        task.finalizedBy jacocoMerge
        jacocoMerge.dependsOn task

        task.doLast {
            logger.info "${jacocoMerge.path} executionData ${task.path}"
            jacocoMerge.executionData task
        }

        def cfg = configurations.getByName("${task.name}Runtime")
        logger.info "${project.path} process config: ${cfg.name}"

        cfg.getAllDependencies().withType(ProjectDependency.class).each { pd ->
            def depProj = pd.dependencyProject
            logger.info "${task.path} dependsOn ${depProj.path}"
            def jm = getJacocoMergeTask(depProj)

            task.finalizedBy jm
            jm.dependsOn task

            task.doLast {
                logger.info "${jm.path} executionData ${task.path}"
                jm.executionData task
            }
        }
    }
}

This will merge all the executionData from all the projects, that used a certain project during testing as a dependency.