Fix serialization issue

Change-Id: Ie2cc832e59018977066dc3d7fbfec2819a9c5fb2
diff --git a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java
index dfdc422..25f1b01 100644
--- a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java
@@ -21,7 +21,6 @@
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.PortNumber;
-import org.onosproject.net.flowobjective.NextObjective;
 
 import java.util.Set;
 
@@ -78,7 +77,7 @@
      *
      * @return current contents of the xconnectNextObjStore
      */
-    ImmutableMap<XconnectKey, NextObjective> getNext();
+    ImmutableMap<XconnectKey, Integer> getNext();
 
     /**
      * Removes given next ID from Xconnect next objective store.