Minor build improvements

build.gradle

@@ -1,8 +1,8 @@
 //// Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 plugins {
-    id "com.github.johnrengelman.shadow"
-    id "java"
+    id 'com.github.johnrengelman.shadow' version '7.1.2'
+    id 'java'
     id 'checkstyle'
 }
 

gradlew

@@ -86,7 +86,10 @@ APP_NAME="Gradle"
 APP_BASE_NAME=${0##*/}
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m" "-XX:+UseZGC"'
+
+# Dependency Caching
+GRADLE_USER_HOME=~/.gradle
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum