diff --git a/core/api/src/main/java/org/onosproject/net/topology/ClusterId.java b/core/api/src/main/java/org/onosproject/net/topology/ClusterId.java
index 676f006..1e6780f 100644
--- a/core/api/src/main/java/org/onosproject/net/topology/ClusterId.java
+++ b/core/api/src/main/java/org/onosproject/net/topology/ClusterId.java
@@ -53,7 +53,7 @@
 
     @Override
     public int hashCode() {
-        return Objects.hash(id);
+        return id;
     }
 
     @Override
diff --git a/core/api/src/main/java/org/onosproject/net/topology/DefaultTopologyEdge.java b/core/api/src/main/java/org/onosproject/net/topology/DefaultTopologyEdge.java
index dacb5fd..99d700e 100644
--- a/core/api/src/main/java/org/onosproject/net/topology/DefaultTopologyEdge.java
+++ b/core/api/src/main/java/org/onosproject/net/topology/DefaultTopologyEdge.java
@@ -20,6 +20,7 @@
 import java.util.Objects;
 
 import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Implementation of the topology edge backed by a link.
@@ -40,7 +41,7 @@
     public DefaultTopologyEdge(TopologyVertex src, TopologyVertex dst, Link link) {
         this.src = src;
         this.dst = dst;
-        this.link = link;
+        this.link = checkNotNull(link);
     }
 
     @Override
@@ -60,7 +61,7 @@
 
     @Override
     public int hashCode() {
-        return Objects.hash(link);
+        return link.hashCode();
     }
 
     @Override
diff --git a/core/api/src/main/java/org/onosproject/net/topology/DefaultTopologyVertex.java b/core/api/src/main/java/org/onosproject/net/topology/DefaultTopologyVertex.java
index 07a09cb..4782bc9 100644
--- a/core/api/src/main/java/org/onosproject/net/topology/DefaultTopologyVertex.java
+++ b/core/api/src/main/java/org/onosproject/net/topology/DefaultTopologyVertex.java
@@ -42,7 +42,7 @@
 
     @Override
     public int hashCode() {
-        return Objects.hash(deviceId);
+        return deviceId.hashCode();
     }
 
     @Override