diff --git a/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/management/ServerDBSyncImpl.java b/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/management/ServerDBSyncImpl.java
index 8cb4e8d0b32..7a77040e0c9 100644
--- a/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/management/ServerDBSyncImpl.java
+++ b/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/management/ServerDBSyncImpl.java
@@ -18,6 +18,7 @@
 package org.apache.cloudstack.network.contrail.management;
 
 import java.io.IOException;
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
@@ -931,7 +932,7 @@ public class ServerDBSyncImpl implements ServerDBSync {
         s_logger.debug("equal " + siModel.getQualifiedName());
     }
     
-    static class ServiceInstanceComparator implements Comparator<ServiceInstance> {
+    static class ServiceInstanceComparator implements Comparator<ServiceInstance>, Serializable {
         @Override
         public int compare(ServiceInstance obj1, ServiceInstance obj2) {
             String name1 = StringUtils.join(obj1.getQualifiedName(), ':');
diff --git a/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/management/ServerEventHandlerImpl.java b/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/management/ServerEventHandlerImpl.java
index 455e6012e43..ec374409fc0 100644
--- a/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/management/ServerEventHandlerImpl.java
+++ b/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/management/ServerEventHandlerImpl.java
@@ -63,10 +63,6 @@ public class ServerEventHandlerImpl implements ServerEventHandler {
         setClassMap();
     }
 
-    protected void finalize () {
-
-    }
-    
     private void setMethodMap() {
         _methodMap = new HashMap<String, Method>();
         Method methods[] = this.getClass().getMethods();
diff --git a/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/model/ModelObject.java b/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/model/ModelObject.java
index 71d28ac5867..e43c9db36cd 100644
--- a/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/model/ModelObject.java
+++ b/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/model/ModelObject.java
@@ -18,6 +18,7 @@
 package org.apache.cloudstack.network.contrail.model;
 
 import java.io.IOException;
+import java.io.Serializable;
 import java.lang.ref.WeakReference;
 import java.util.TreeSet;
 
@@ -38,7 +39,7 @@ import com.cloud.exception.InternalErrorException;
  * The update method pushes updates to the contrail API server.
  */
 public interface ModelObject {
-    public static class ModelReference implements Comparable<ModelReference> {
+    public static class ModelReference implements Comparable<ModelReference>, Serializable {
         WeakReference<ModelObject> reference;
         ModelReference(ModelObject obj) {
             reference = new WeakReference<ModelObject>(obj);
@@ -57,8 +58,22 @@ public interface ModelObject {
             
             return lhs.compareTo(rhs);
         }
+
+        @Override
+        public int hashCode() {
+            final int prime = 31;
+            int result = 1;
+            result = prime * result
+                    + ((reference == null) ? 0 : reference.hashCode());
+            return result;
+        }
+
         @Override
         public boolean equals(Object other) {
+            if (this == other)
+                return true;
+            if (other == null)
+                return false;
             try {
                 ModelReference rhs = (ModelReference) other;
                 return compareTo(rhs) == 0;
@@ -69,6 +84,8 @@ public interface ModelObject {
         public ModelObject get() {
             return reference.get();
         }
+        
+        
     };
     
     public void addSuccessor(ModelObject child);
diff --git a/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/model/ModelObjectBase.java b/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/model/ModelObjectBase.java
index f22c7c546a3..8d48fa10492 100644
--- a/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/model/ModelObjectBase.java
+++ b/plugins/network-elements/juniper-contrail/src/org/apache/cloudstack/network/contrail/model/ModelObjectBase.java
@@ -17,11 +17,12 @@
 
 package org.apache.cloudstack.network.contrail.model;
 
+import java.io.Serializable;
 import java.util.Comparator;
 import java.util.TreeSet;
 
 public abstract class ModelObjectBase implements ModelObject {
-    public static class UuidComparator implements Comparator<ModelObject> {
+    public static class UuidComparator implements Comparator<ModelObject>, Serializable {
         @Override
         public int compare(ModelObject lhs, ModelObject rhs) {
             if (lhs == null) {
@@ -78,8 +79,23 @@ public abstract class ModelObjectBase implements ModelObject {
         _successors.clear();
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result
+                + ((_ancestors == null) ? 0 : _ancestors.hashCode());
+        result = prime * result
+                + ((_successors == null) ? 0 : _successors.hashCode());
+        return result;
+    }
+
     @Override
     public boolean equals(Object rhs) {
+        if (this == rhs)
+            return true;
+        if (rhs == null)
+            return false;
         ModelObject other;
         try {
             other = (ModelObject) rhs;