diff --git a/core/api/src/main/java/org/onlab/onos/net/ConnectPoint.java b/core/api/src/main/java/org/onlab/onos/net/ConnectPoint.java
index 8f332e9..35adde9 100644
--- a/core/api/src/main/java/org/onlab/onos/net/ConnectPoint.java
+++ b/core/api/src/main/java/org/onlab/onos/net/ConnectPoint.java
@@ -66,6 +66,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof ConnectPoint) {
             final ConnectPoint other = (ConnectPoint) obj;
             return Objects.equals(this.elementId, other.elementId) &&
diff --git a/core/api/src/main/java/org/onlab/onos/net/DefaultDevice.java b/core/api/src/main/java/org/onlab/onos/net/DefaultDevice.java
index c6e65f5..29a8d17 100644
--- a/core/api/src/main/java/org/onlab/onos/net/DefaultDevice.java
+++ b/core/api/src/main/java/org/onlab/onos/net/DefaultDevice.java
@@ -85,6 +85,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof DefaultDevice) {
             final DefaultDevice other = (DefaultDevice) obj;
             return Objects.equals(this.id, other.id) &&
diff --git a/core/api/src/main/java/org/onlab/onos/net/DefaultHost.java b/core/api/src/main/java/org/onlab/onos/net/DefaultHost.java
index fad9147..8a2d6e6 100644
--- a/core/api/src/main/java/org/onlab/onos/net/DefaultHost.java
+++ b/core/api/src/main/java/org/onlab/onos/net/DefaultHost.java
@@ -63,6 +63,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof DefaultHost) {
             final DefaultHost other = (DefaultHost) obj;
             return Objects.equals(this.id, other.id) &&
diff --git a/core/api/src/main/java/org/onlab/onos/net/DefaultLink.java b/core/api/src/main/java/org/onlab/onos/net/DefaultLink.java
index e937bf3..8771faa 100644
--- a/core/api/src/main/java/org/onlab/onos/net/DefaultLink.java
+++ b/core/api/src/main/java/org/onlab/onos/net/DefaultLink.java
@@ -53,6 +53,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof DefaultLink) {
             final DefaultLink other = (DefaultLink) obj;
             return Objects.equals(this.src, other.src) &&
diff --git a/core/api/src/main/java/org/onlab/onos/net/DefaultPath.java b/core/api/src/main/java/org/onlab/onos/net/DefaultPath.java
index 63c9e88..cab41b8 100644
--- a/core/api/src/main/java/org/onlab/onos/net/DefaultPath.java
+++ b/core/api/src/main/java/org/onlab/onos/net/DefaultPath.java
@@ -57,11 +57,14 @@
 
     @Override
     public int hashCode() {
-        return 31 * super.hashCode() + Objects.hash(links);
+        return Objects.hash(links);
     }
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof DefaultPath) {
             final DefaultPath other = (DefaultPath) obj;
             return Objects.equals(this.links, other.links);
diff --git a/core/api/src/main/java/org/onlab/onos/net/DefaultPort.java b/core/api/src/main/java/org/onlab/onos/net/DefaultPort.java
index 375becd..d07def8 100644
--- a/core/api/src/main/java/org/onlab/onos/net/DefaultPort.java
+++ b/core/api/src/main/java/org/onlab/onos/net/DefaultPort.java
@@ -58,6 +58,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof DefaultPort) {
             final DefaultPort other = (DefaultPort) obj;
             return Objects.equals(this.element.id(), other.element.id()) &&
diff --git a/core/api/src/main/java/org/onlab/onos/net/ElementId.java b/core/api/src/main/java/org/onlab/onos/net/ElementId.java
index a75f11e..d2cd398 100644
--- a/core/api/src/main/java/org/onlab/onos/net/ElementId.java
+++ b/core/api/src/main/java/org/onlab/onos/net/ElementId.java
@@ -40,6 +40,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof ElementId) {
             final ElementId that = (ElementId) obj;
             return this.getClass() == that.getClass() &&
diff --git a/core/api/src/main/java/org/onlab/onos/net/PortNumber.java b/core/api/src/main/java/org/onlab/onos/net/PortNumber.java
index 56e15a2..cfb11d5 100644
--- a/core/api/src/main/java/org/onlab/onos/net/PortNumber.java
+++ b/core/api/src/main/java/org/onlab/onos/net/PortNumber.java
@@ -79,6 +79,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof PortNumber) {
             final PortNumber other = (PortNumber) obj;
             return this.number == other.number;
diff --git a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultFlowRule.java b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultFlowRule.java
index d3745b4..bd4c7f3 100644
--- a/core/api/src/main/java/org/onlab/onos/net/flow/DefaultFlowRule.java
+++ b/core/api/src/main/java/org/onlab/onos/net/flow/DefaultFlowRule.java
@@ -147,7 +147,6 @@
      * @see java.lang.Object#equals(java.lang.Object)
      */
     public boolean equals(Object obj) {
-
         if (this == obj) {
             return true;
         }
diff --git a/core/api/src/main/java/org/onlab/onos/net/packet/DefaultInboundPacket.java b/core/api/src/main/java/org/onlab/onos/net/packet/DefaultInboundPacket.java
index 8c57adc..fb31b10 100644
--- a/core/api/src/main/java/org/onlab/onos/net/packet/DefaultInboundPacket.java
+++ b/core/api/src/main/java/org/onlab/onos/net/packet/DefaultInboundPacket.java
@@ -54,6 +54,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof InboundPacket) {
             final DefaultInboundPacket other = (DefaultInboundPacket) obj;
             return Objects.equals(this.receivedFrom, other.receivedFrom) &&
diff --git a/core/api/src/main/java/org/onlab/onos/net/provider/ProviderId.java b/core/api/src/main/java/org/onlab/onos/net/provider/ProviderId.java
index 5fc0150..8d3d571 100644
--- a/core/api/src/main/java/org/onlab/onos/net/provider/ProviderId.java
+++ b/core/api/src/main/java/org/onlab/onos/net/provider/ProviderId.java
@@ -50,12 +50,12 @@
         if (this == obj) {
             return true;
         }
-        if (obj == null || getClass() != obj.getClass()) {
-            return false;
+        if (obj instanceof ProviderId) {
+            final ProviderId other = (ProviderId) obj;
+            return Objects.equals(this.scheme, other.scheme) &&
+                    Objects.equals(this.id, other.id);
         }
-        final ProviderId other = (ProviderId) obj;
-        return Objects.equals(this.scheme, other.scheme) &&
-                Objects.equals(this.id, other.id);
+        return false;
     }
 
     @Override
diff --git a/core/api/src/main/java/org/onlab/onos/net/topology/ClusterId.java b/core/api/src/main/java/org/onlab/onos/net/topology/ClusterId.java
index 502eee1..9f0e20b 100644
--- a/core/api/src/main/java/org/onlab/onos/net/topology/ClusterId.java
+++ b/core/api/src/main/java/org/onlab/onos/net/topology/ClusterId.java
@@ -43,6 +43,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof ClusterId) {
             final ClusterId other = (ClusterId) obj;
             return Objects.equals(this.id, other.id);
diff --git a/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyCluster.java b/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyCluster.java
index f33dcf7..b6cc9bd 100644
--- a/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyCluster.java
+++ b/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyCluster.java
@@ -59,6 +59,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof DefaultTopologyCluster) {
             final DefaultTopologyCluster other = (DefaultTopologyCluster) obj;
             return Objects.equals(this.id, other.id) &&
diff --git a/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyEdge.java b/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyEdge.java
index 00eb3d2..c399f3c 100644
--- a/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyEdge.java
+++ b/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyEdge.java
@@ -50,6 +50,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof DefaultTopologyEdge) {
             final DefaultTopologyEdge other = (DefaultTopologyEdge) obj;
             return Objects.equals(this.link, other.link);
diff --git a/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyVertex.java b/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyVertex.java
index 7bc231e..4337f58 100644
--- a/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyVertex.java
+++ b/core/api/src/main/java/org/onlab/onos/net/topology/DefaultTopologyVertex.java
@@ -32,6 +32,9 @@
 
     @Override
     public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
         if (obj instanceof DefaultTopologyVertex) {
             final DefaultTopologyVertex other = (DefaultTopologyVertex) obj;
             return Objects.equals(this.deviceId, other.deviceId);