roles update and gradle scripts fixes

mppJavaProject.gradle

@@ -1,7 +1,7 @@
 project.version = "$version"
 project.group = "$group"
 
- apply from: "$publishGradlePath"
+apply from: "$publishGradlePath"
 
 kotlin {
     jvm().compilations.main {
@@ -31,3 +31,8 @@ kotlin {
         }
     }
 }
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+}