Maybe fixed 'warning: [options] bootstrap class path not set in conjunction with -source 1.7'

common.gradle

@@ -8,7 +8,7 @@ apply plugin: 'maven'
 group = 'org.jmonkeyengine'
 version = jmePomVersion
 
-sourceCompatibility = '1.7'
+sourceCompatibility = '1.8'
 [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
 
 repositories {