Update jacoco configuration

Author: acoburn

build.gradle

@@ -37,6 +37,14 @@ ext {
     osgiCompendiumVersion = '5.0.0'
     paxExamVersion = '4.12.0'
     projectOsgiVersion = project.version.replaceAll("-SNAPSHOT", ".SNAPSHOT")
+
+    jacocoTestProjects = [
+        'camel-ldp-elasticsearch',
+        'camel-ldp-ldpath',
+        'camel-ldp-triplestore',
+        'camel-ldp-websub',
+        'camel-ldp-osgi'
+    ]
 }
 
 allprojects { subproj ->
@@ -279,6 +287,14 @@ subprojects { subproj ->
             html.enabled = true
         }
     }
+
+    afterEvaluate {
+        if (subproj.name in jacocoTestProjects) {
+            jacoco {
+                applyTo subproj.tasks.matching { it.name == 'junitPlatformTest' }
+            }
+        }
+    }
 }
 
 configure(rootProject) {
@@ -322,18 +338,28 @@ configure(rootProject) {
         }
     }
 
-	task jacocoRootReport(type: org.gradle.testing.jacoco.tasks.JacocoReport) {
-		dependsOn = subprojects.test
-		additionalSourceDirs = files(subprojects.sourceSets.main.allSource.srcDirs)
-		sourceDirectories = files(subprojects.sourceSets.main.allSource.srcDirs)
-		classDirectories =  files(subprojects.sourceSets.main.output)
-        executionData = files(subprojects.jacocoTestReport.executionData)
-		reports {
-			html.enabled = true
-			xml.enabled = true
-			csv.enabled = false
-		}
-	}
+    task jacocoMerge(type: JacocoMerge) {
+        subprojects.findAll { it.name in jacocoTestProjects }
+                .each { subproj ->
+            executionData fileTree(dir: "${subproj.buildDir}/jacoco", include: '*.exec')
+            dependsOn subproj.tasks.withType(Test)
+        }
+    }
+
+    task jacocoRootReport(type: JacocoReport, dependsOn: jacocoMerge) {
+        sourceDirectories = files(subprojects
+                .findAll { it.name in jacocoTestProjects }
+                .sourceSets.main.allSource.srcDirs)
+        classDirectories = files(subprojects
+                .findAll { it.name in jacocoTestProjects }
+                .sourceSets.main.output)
+        executionData jacocoMerge.destinationFile
+        reports {
+            html.enabled = true
+            xml.enabled = true
+            csv.enabled = false
+        }
+    }
 
     coveralls {
         sourceDirs = subprojects.sourceSets.main.allSource.srcDirs.flatten()