Upgrade gradle and cleanup build file

Author: jentfoo

build.gradle

@@ -80,6 +80,7 @@ plugins.withType(JavaPlugin) {
 }
 
 test {
+  maxParallelForks = Math.max(1, (int)(Runtime.getRuntime().availableProcessors() / 4))
   jacoco {
     excludes = ['**/package-info**','**/*Test']
     destinationFile = file("$buildDir/reports/jacoco/test.exec")
@@ -89,26 +90,25 @@ test {
   setBinResultsDir(file("${buildDir}/reports/tests/bin"))
 }
 
-build.dependsOn("jacocoTestReport");
+build.dependsOn jacocoTestReport
 
 jacocoTestReport {
   doFirst {
-    classDirectories = fileTree(dir: 'build/classes/main', include: 'org/threadly/**')
-    sourceDirectories = fileTree(dir: 'scr/main/java', include: 'org/threadly/**')
+    classDirectories = fileTree(dir: 'build/classes/java/main', include: 'org/threadly/**')
+    sourceDirectories = fileTree(dir: 'src/main/java', include: 'org/threadly/**')
   }
   reports {
     csv.enabled = false
     xml.enabled = true
-    xml.destination = file("${buildDir}/reports/jacoco/jacoco.xml")
+    xml.destination = file("$buildDir/reports/jacoco/jacoco.xml")
     html.enabled = true
-    html.destination = file("${buildDir}/reports/jacoco/html")
+    html.destination = file("$buildDir/reports/jacoco/html")
   }
   doLast {
     println "Test results available at:"
     println "html - $buildDir/reports/tests/html/index.html"
     println "Test coverage reports available at:"
     println "html - $buildDir/reports/jacoco/html/index.html"
-    println "xml  - $buildDir/reports/jacoco/jacoco.xml"
   }
 }
 

gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.7-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-bin.zip