diff --git a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/AbstractInsertionCalculator.java b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/AbstractInsertionCalculator.java
index 6f3d54a4..fc82d6ad 100644
--- a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/AbstractInsertionCalculator.java
+++ b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/AbstractInsertionCalculator.java
@@ -21,6 +21,7 @@ package com.graphhopper.jsprit.core.algorithm.recreate;
 import com.graphhopper.jsprit.core.problem.constraint.ConstraintManager;
 import com.graphhopper.jsprit.core.problem.constraint.HardActivityConstraint;
 import com.graphhopper.jsprit.core.problem.constraint.HardActivityConstraint.ConstraintsStatus;
+import com.graphhopper.jsprit.core.problem.constraint.HardConstraint;
 import com.graphhopper.jsprit.core.problem.constraint.HardRouteConstraint;
 import com.graphhopper.jsprit.core.problem.misc.JobInsertionContext;
 import com.graphhopper.jsprit.core.problem.solution.route.activity.TourActivity;
@@ -45,17 +46,17 @@ abstract class AbstractInsertionCalculator implements JobInsertionCostsCalculato
         return null;
     }
 
-    ConstraintsStatus fulfilled(JobInsertionContext iFacts, TourActivity prevAct, TourActivity newAct, TourActivity nextAct, double prevActDepTime, Collection<String> failedActivityConstraints, ConstraintManager constraintManager) {
+    ConstraintsStatus fulfilled(JobInsertionContext iFacts, TourActivity prevAct, TourActivity newAct, TourActivity nextAct, double prevActDepTime, Collection<HardConstraint> failedActivityConstraints, ConstraintManager constraintManager) {
         ConstraintsStatus notFulfilled = null;
-        List<String> failed = new ArrayList<>();
+        List<HardConstraint> failed = new ArrayList<>();
         for (HardActivityConstraint c : constraintManager.getCriticalHardActivityConstraints()) {
             ConstraintsStatus status = c.fulfilled(iFacts, prevAct, newAct, nextAct, prevActDepTime);
             if (status.equals(ConstraintsStatus.NOT_FULFILLED_BREAK)) {
-                failedActivityConstraints.add(c.getClass().getSimpleName());
+                failedActivityConstraints.add(c);
                 return status;
             } else {
                 if (status.equals(ConstraintsStatus.NOT_FULFILLED)) {
-                    failed.add(c.getClass().getSimpleName());
+                    failed.add(c);
                     notFulfilled = status;
                 }
             }
@@ -68,11 +69,11 @@ abstract class AbstractInsertionCalculator implements JobInsertionCostsCalculato
         for (HardActivityConstraint c : constraintManager.getHighPrioHardActivityConstraints()) {
             ConstraintsStatus status = c.fulfilled(iFacts, prevAct, newAct, nextAct, prevActDepTime);
             if (status.equals(ConstraintsStatus.NOT_FULFILLED_BREAK)) {
-                failedActivityConstraints.add(c.getClass().getSimpleName());
+                failedActivityConstraints.add(c);
                 return status;
             } else {
                 if (status.equals(ConstraintsStatus.NOT_FULFILLED)) {
-                    failed.add(c.getClass().getSimpleName());
+                    failed.add(c);
                     notFulfilled = status;
                 }
             }
@@ -85,7 +86,7 @@ abstract class AbstractInsertionCalculator implements JobInsertionCostsCalculato
         for (HardActivityConstraint constraint : constraintManager.getLowPrioHardActivityConstraints()) {
             ConstraintsStatus status = constraint.fulfilled(iFacts, prevAct, newAct, nextAct, prevActDepTime);
             if (status.equals(ConstraintsStatus.NOT_FULFILLED_BREAK) || status.equals(ConstraintsStatus.NOT_FULFILLED)) {
-                failedActivityConstraints.add(constraint.getClass().getSimpleName());
+                failedActivityConstraints.add(constraint);
                 return status;
             }
         }
diff --git a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ServiceInsertionCalculator.java b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ServiceInsertionCalculator.java
index 6007decb..1ed5a68b 100644
--- a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ServiceInsertionCalculator.java
+++ b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ServiceInsertionCalculator.java
@@ -20,6 +20,7 @@ package com.graphhopper.jsprit.core.algorithm.recreate;
 import com.graphhopper.jsprit.core.problem.JobActivityFactory;
 import com.graphhopper.jsprit.core.problem.constraint.ConstraintManager;
 import com.graphhopper.jsprit.core.problem.constraint.HardActivityConstraint.ConstraintsStatus;
+import com.graphhopper.jsprit.core.problem.constraint.HardConstraint;
 import com.graphhopper.jsprit.core.problem.constraint.SoftActivityConstraint;
 import com.graphhopper.jsprit.core.problem.constraint.SoftRouteConstraint;
 import com.graphhopper.jsprit.core.problem.cost.VehicleRoutingActivityCosts;
@@ -108,7 +109,7 @@ final class ServiceInsertionCalculator extends AbstractInsertionCalculator {
         InsertionData noInsertion = checkRouteContraints(insertionContext, constraintManager);
         if (noInsertion != null) return noInsertion;
 
-        Collection<String> failedActivityConstraints = new ArrayList<>();
+        Collection<HardConstraint> failedActivityConstraints = new ArrayList<>();
 
         /*
         check soft constraints at route level
@@ -167,7 +168,9 @@ final class ServiceInsertionCalculator extends AbstractInsertionCalculator {
         }
         if(insertionIndex == InsertionData.NO_INDEX) {
             InsertionData emptyInsertionData = new InsertionData.NoInsertionFound();
-            emptyInsertionData.getFailedConstraintNames().addAll(failedActivityConstraints);
+            for (HardConstraint c : failedActivityConstraints) {
+                emptyInsertionData.addFailedConstrainName(c.getClass().getSimpleName());
+            }
             return emptyInsertionData;
         }
         InsertionData insertionData = new InsertionData(bestCost, InsertionData.NO_INDEX, insertionIndex, newVehicle, newDriver);
diff --git a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ShipmentInsertionCalculator.java b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ShipmentInsertionCalculator.java
index 9eb5967c..d7b3eecd 100644
--- a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ShipmentInsertionCalculator.java
+++ b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ShipmentInsertionCalculator.java
@@ -20,6 +20,7 @@ package com.graphhopper.jsprit.core.algorithm.recreate;
 import com.graphhopper.jsprit.core.problem.JobActivityFactory;
 import com.graphhopper.jsprit.core.problem.constraint.ConstraintManager;
 import com.graphhopper.jsprit.core.problem.constraint.HardActivityConstraint.ConstraintsStatus;
+import com.graphhopper.jsprit.core.problem.constraint.HardConstraint;
 import com.graphhopper.jsprit.core.problem.constraint.SoftActivityConstraint;
 import com.graphhopper.jsprit.core.problem.constraint.SoftRouteConstraint;
 import com.graphhopper.jsprit.core.problem.cost.VehicleRoutingActivityCosts;
@@ -128,7 +129,7 @@ final class ShipmentInsertionCalculator extends AbstractInsertionCalculator {
         //pickupShipmentLoop
         List<TourActivity> activities = currentRoute.getTourActivities().getActivities();
 
-        List<String> failedActivityConstraints = new ArrayList<>();
+        List<HardConstraint> failedActivityConstraints = new ArrayList<>();
         while (!tourEnd) {
             TourActivity nextAct;
             if (i < activities.size()) {
@@ -228,7 +229,9 @@ final class ShipmentInsertionCalculator extends AbstractInsertionCalculator {
         }
         if (pickupInsertionIndex == InsertionData.NO_INDEX) {
             InsertionData emptyInsertionData = new InsertionData.NoInsertionFound();
-            emptyInsertionData.getFailedConstraintNames().addAll(failedActivityConstraints);
+            for (HardConstraint failed : failedActivityConstraints) {
+                emptyInsertionData.addFailedConstrainName(failed.getClass().getSimpleName());
+            }
             return emptyInsertionData;
         }
         InsertionData insertionData = new InsertionData(bestCost, pickupInsertionIndex, deliveryInsertionIndex, newVehicle, newDriver);
diff --git a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ShipmentInsertionCalculatorFlex.java b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ShipmentInsertionCalculatorFlex.java
index b490b246..8862481a 100644
--- a/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ShipmentInsertionCalculatorFlex.java
+++ b/jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/recreate/ShipmentInsertionCalculatorFlex.java
@@ -20,6 +20,7 @@ package com.graphhopper.jsprit.core.algorithm.recreate;
 import com.graphhopper.jsprit.core.problem.JobActivityFactory;
 import com.graphhopper.jsprit.core.problem.constraint.ConstraintManager;
 import com.graphhopper.jsprit.core.problem.constraint.HardActivityConstraint.ConstraintsStatus;
+import com.graphhopper.jsprit.core.problem.constraint.HardConstraint;
 import com.graphhopper.jsprit.core.problem.constraint.SoftActivityConstraint;
 import com.graphhopper.jsprit.core.problem.constraint.SoftRouteConstraint;
 import com.graphhopper.jsprit.core.problem.cost.VehicleRoutingActivityCosts;
@@ -146,7 +147,7 @@ public final class ShipmentInsertionCalculatorFlex extends AbstractInsertionCalc
         //pickupShipmentLoop
         List<TourActivity> activities = currentRoute.getTourActivities().getActivities();
 
-        List<String> failedActivityConstraints = new ArrayList<>();
+        List<HardConstraint> failedActivityConstraints = new ArrayList<>();
         while (!tourEnd) {
             TourActivity nextAct;
             if (i < activities.size()) {
@@ -252,7 +253,9 @@ public final class ShipmentInsertionCalculatorFlex extends AbstractInsertionCalc
 
         if (pickupInsertionIndex == InsertionData.NO_INDEX) {
             InsertionData emptyInsertionData = new InsertionData.NoInsertionFound();
-            emptyInsertionData.getFailedConstraintNames().addAll(failedActivityConstraints);
+            for (HardConstraint failed : failedActivityConstraints) {
+                emptyInsertionData.addFailedConstrainName(failed.getClass().getSimpleName());
+            }
             return emptyInsertionData;
         }
         InsertionData insertionData = new InsertionData(bestCost, pickupInsertionIndex, deliveryInsertionIndex, newVehicle, newDriver);