diff --git a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/solution/route/VehicleRoute.java b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/solution/route/VehicleRoute.java
index 7dd0c17d..40fe5907 100644
--- a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/solution/route/VehicleRoute.java
+++ b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/problem/solution/route/VehicleRoute.java
@@ -115,15 +115,15 @@ public class VehicleRoute {
 
         private End end;
 
-        private TourActivities tourActivities = new TourActivities();
+        private final TourActivities tourActivities = new TourActivities();
 
-        private TourActivityFactory serviceActivityFactory = new DefaultTourActivityFactory();
-
-        private TourShipmentActivityFactory shipmentActivityFactory = new DefaultShipmentActivityFactory();
-
-        private Set<Shipment> openShipments = new HashSet<Shipment>();
+        private final Set<Shipment> openShipments = new HashSet<Shipment>();
 
         private JobActivityFactory jobActivityFactory = new JobActivityFactory() {
+            
+            private final TourShipmentActivityFactory shipmentActivityFactory = new DefaultShipmentActivityFactory();
+            
+            private final  TourActivityFactory serviceActivityFactory = new DefaultTourActivityFactory();
 
             @Override
             public List<AbstractActivity> createActivities(Job job) {