KAFKA-13922: Adjustments for jacoco, coverage reporting (apache#11982)

Jacoco and scoverage reporting hasn't been working for a while. This commit fixes report generation. After this PR only subproject level reports are generated as Jenkins and Sonar only cares about that.
This PR doesn't change Kafka's Jenkinsfile.

Reviewers: Viktor Somogyi-Vass <[email protected]>

build.gradle

@@ -43,7 +43,7 @@ plugins {
   // includes spotbugs version 4.7.4, in which case CVE-2022-42920 can
   // be dropped from gradle/resources/dependencycheck-suppressions.xml
   id "com.github.spotbugs" version '5.1.3' apply false
-  id 'org.scoverage' version '7.0.1' apply false
+  id 'org.scoverage' version '8.0.3' apply false
   // Updating the shadow plugin version to 8.1.1 causes issue with signing and publishing the shadowed
   // artifacts - see https://github.com/johnrengelman/shadow/issues/901
   id 'com.github.johnrengelman.shadow' version '8.1.0' apply false
@@ -750,7 +750,7 @@ subprojects {
 
   if (userEnableTestCoverage) {
     def coverageGen = it.path == ':core' ? 'reportScoverage' : 'jacocoTestReport'
-    task reportCoverage(dependsOn: [coverageGen])
+    tasks.register('reportCoverage').configure { dependsOn(coverageGen) }
   }
 
   dependencyCheck {
@@ -800,33 +800,8 @@ def checkstyleConfigProperties(configFileName) {
   [importControlFile: "$configFileName"]
 }
 
-// Aggregates all jacoco results into the root project directory
 if (userEnableTestCoverage) {
-  task jacocoRootReport(type: org.gradle.testing.jacoco.tasks.JacocoReport) {
-    def javaProjects = subprojects.findAll { it.path != ':core' }
-
-    description = 'Generates an aggregate report from all subprojects'
-    dependsOn(javaProjects.test)
-
-    additionalSourceDirs.from = javaProjects.sourceSets.main.allSource.srcDirs
-    sourceDirectories.from = javaProjects.sourceSets.main.allSource.srcDirs
-    classDirectories.from = javaProjects.sourceSets.main.output
-    executionData.from = javaProjects.jacocoTestReport.executionData
-
-    reports {
-      html.required = true
-      xml.required = true
-    }
-    // workaround to ignore projects that don't have any tests at all
-    onlyIf = { true }
-    doFirst {
-      executionData = files(executionData.findAll { it.exists() })
-    }
-  }
-}
-
-if (userEnableTestCoverage) {
-  task reportCoverage(dependsOn: ['jacocoRootReport', 'core:reportCoverage'])
+  tasks.register('reportCoverage').configure { dependsOn(subprojects.reportCoverage) }
 }
 
 def connectPkgs = [
@@ -1003,6 +978,9 @@ project(':core') {
   if (userEnableTestCoverage) {
     scoverage {
       scoverageVersion = versions.scoverage
+      if (versions.baseScala == '2.13') {
+        scoverageScalaVersion = '2.13.9' // there's no newer 2.13 artifact, org.scoverage:scalac-scoverage-plugin_2.13.9:2.0.11 is the latest as of now
+      }
       reportDir = file("${rootProject.buildDir}/scoverage")
       highlighting = false
       minimumRate = 0.0
@@ -1294,7 +1272,7 @@ project(':metadata') {
     }
     test {
       java {
-        srcDirs = ["src/generated/java", "src/test/java"]
+        srcDirs = ["src/test/java"]
       }
     }
   }
@@ -1661,7 +1639,7 @@ project(':raft') {
     }
     test {
       java {
-        srcDirs = ["src/generated/java", "src/test/java"]
+        srcDirs = ["src/test/java"]
       }
     }
   }
@@ -1904,7 +1882,7 @@ project(':storage') {
     }
     test {
       java {
-        srcDirs = ["src/generated/java", "src/test/java"]
+        srcDirs = ["src/test/java"]
       }
     }
   }
@@ -2218,7 +2196,7 @@ project(':streams') {
     }
     test {
       java {
-        srcDirs = ["src/generated/java", "src/test/java"]
+        srcDirs = ["src/test/java"]
       }
     }
   }

gradle/dependencies.gradle

@@ -159,7 +159,7 @@ versions += [
   // https://github.com/scalameta/scalafmt/releases/tag/v3.1.0.
   scalafmt: "3.7.14",
   scalaJava8Compat : "1.0.2",
-  scoverage: "1.9.3",
+  scoverage: "2.0.11",
   slf4j: "1.7.36",
   snappy: "1.1.10.5",
   spotbugs: "4.8.0",