Cleaned code

src/main/java/org/gcube/informationsystem/resourceregistry/dbinitialization/DatabaseEnvironment.java

@@ -182,25 +182,18 @@ public class DatabaseEnvironment {
 		try {
 			boolean created = initGraphDB();
 			
-			AdminSecurityContext adminSecurityContext = AdminSecurityContext.getInstance();
-			
-			QueryTemplatesSecurityContext queryTemplatesSecurityContext = QueryTemplatesSecurityContext.getInstance();
-			TypeSecurityContext typeSecurityContext = TypeSecurityContext.getInstance();
-			ContextSecurityContext contextSecurityContext = ContextSecurityContext.getInstance();
-			
 			if(created) {
 				ODatabasePool pool = new ODatabasePool(DatabaseEnvironment.DB_URI, CHANGED_ADMIN_USERNAME,
 						CHANGED_ADMIN_PASSWORD);
 				ODatabaseDocument oDatabaseDocument = pool.acquire();
-				adminSecurityContext.create(oDatabaseDocument);
+				AdminSecurityContext.getInstance().create(oDatabaseDocument);
 				oDatabaseDocument.commit();
 				oDatabaseDocument.close();
 				pool.close();
 				
-				queryTemplatesSecurityContext.create();
-				typeSecurityContext.create();
-				contextSecurityContext.create();
-				
+				QueryTemplatesSecurityContext.getInstance().create();
+				TypeSecurityContext.getInstance().create();
+				ContextSecurityContext.getInstance().create();
 				
 				List<Class<? extends Element>> definitionToBeCreated = new ArrayList<>();
 				definitionToBeCreated.add(PropertyElement.class);