diff --git a/core/api/src/main/java/org/onlab/onos/net/DeviceId.java b/core/api/src/main/java/org/onlab/onos/net/DeviceId.java
index 8d96d8b..ef8c5ab 100644
--- a/core/api/src/main/java/org/onlab/onos/net/DeviceId.java
+++ b/core/api/src/main/java/org/onlab/onos/net/DeviceId.java
@@ -7,9 +7,6 @@
  */
 public final class DeviceId extends ElementId {
 
-    // Default constructor for serialization
-    protected DeviceId() {}
-
     // Public construction is prohibited
     private DeviceId(URI uri) {
         super(uri);
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 8d3d571..725748a 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
@@ -12,12 +12,6 @@
     private final String scheme;
     private final String id;
 
-    // Default constructor for serialization
-    protected ProviderId() {
-        scheme = null;
-        id = null;
-    }
-
     /**
      * Creates a new provider identifier from the specified string.
      * The providers are expected to follow the reverse DNS convention, e.g.
@@ -40,6 +34,15 @@
         return scheme;
     }
 
+    /**
+     * Returns the device URI scheme specific id portion.
+     *
+     * @return id
+     */
+    public String id() {
+        return id;
+    }
+
     @Override
     public int hashCode() {
         return Objects.hash(scheme, id);
diff --git a/core/net/src/test/java/org/onlab/onos/net/device/impl/DistributedDeviceManagerTest.java b/core/net/src/test/java/org/onlab/onos/net/device/impl/DistributedDeviceManagerTest.java
index a928572..222216c 100644
--- a/core/net/src/test/java/org/onlab/onos/net/device/impl/DistributedDeviceManagerTest.java
+++ b/core/net/src/test/java/org/onlab/onos/net/device/impl/DistributedDeviceManagerTest.java
@@ -112,7 +112,7 @@
         mgr.deactivate();
 
         dstore.deactivate();
-        dstore.theInstance.shutdown();
+        ((TestDistributedDeviceStore) dstore).shutdownHz();
     }
 
     private void connectDevice(DeviceId deviceId, String swVersion) {
@@ -290,5 +290,12 @@
                 }
             };
         }
+
+        /**
+         * Shutdowns the hazelcast instance.
+         */
+        public void shutdownHz() {
+            theInstance.shutdown();
+        }
     }
 }
diff --git a/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java b/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java
index 4a60eb8..bd0aa06 100644
--- a/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java
+++ b/core/store/src/main/java/org/onlab/onos/store/device/impl/DefaultPortSerializer.java
@@ -16,6 +16,9 @@
 import com.google.common.collect.ImmutableSet;
 
 // TODO move to util, etc.
+/**
+ * Kryo Serializer for {@link DefaultPort}.
+ */
 public final class DefaultPortSerializer extends
         Serializer<DefaultPort> {
 
@@ -23,6 +26,9 @@
         = new CollectionSerializer(IpPrefix.class,
                             new IpPrefixSerializer(), false);
 
+    /**
+     * Default constructor.
+     */
     public DefaultPortSerializer() {
         // non-null, immutable
         super(false, true);
diff --git a/core/store/src/main/java/org/onlab/onos/store/device/impl/DistributedDeviceStore.java b/core/store/src/main/java/org/onlab/onos/store/device/impl/DistributedDeviceStore.java
index b8c1cdf..fe03cda 100644
--- a/core/store/src/main/java/org/onlab/onos/store/device/impl/DistributedDeviceStore.java
+++ b/core/store/src/main/java/org/onlab/onos/store/device/impl/DistributedDeviceStore.java
@@ -44,6 +44,10 @@
 import org.onlab.util.KryoPool;
 import org.slf4j.Logger;
 
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.Serializer;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
 import com.google.common.base.Optional;
 import com.google.common.cache.CacheBuilder;
 import com.google.common.cache.CacheLoader;
@@ -68,103 +72,26 @@
 @Service
 public class DistributedDeviceStore implements DeviceStore {
 
-    /**
-     * An IMap EntryListener, which reflects each remote event to cache.
-     *
-     * @param <K> IMap key type after deserialization
-     * @param <V> IMap value type after deserialization
-     */
-    public static final class RemoteEventHandler<K, V> extends
-            EntryAdapter<byte[], byte[]> {
-
-        private LoadingCache<K, Optional<V>> cache;
-
-        /**
-         * Constructor.
-         *
-         * @param cache cache to update
-         */
-        public RemoteEventHandler(
-                LoadingCache<K, Optional<V>> cache) {
-            this.cache = checkNotNull(cache);
-        }
-
-        @Override
-        public void mapCleared(MapEvent event) {
-            cache.invalidateAll();
-        }
-
-        @Override
-        public void entryUpdated(EntryEvent<byte[], byte[]> event) {
-            cache.put(POOL.<K>deserialize(event.getKey()),
-                        Optional.of(POOL.<V>deserialize(
-                                        event.getValue())));
-        }
-
-        @Override
-        public void entryRemoved(EntryEvent<byte[], byte[]> event) {
-            cache.invalidate(POOL.<DeviceId>deserialize(event.getKey()));
-        }
-
-        @Override
-        public void entryAdded(EntryEvent<byte[], byte[]> event) {
-            entryUpdated(event);
-        }
-    }
-
-    /**
-     * CacheLoader to wrap Map value with Optional,
-     * to handle negative hit on underlying IMap.
-     *
-     * @param <K> IMap key type after deserialization
-     * @param <V> IMap value type after deserialization
-     */
-    public static final class OptionalCacheLoader<K, V> extends
-            CacheLoader<K, Optional<V>> {
-
-        private IMap<byte[], byte[]> rawMap;
-
-        /**
-         * Constructor.
-         *
-         * @param rawMap underlying IMap
-         */
-        public OptionalCacheLoader(IMap<byte[], byte[]> rawMap) {
-            this.rawMap = checkNotNull(rawMap);
-        }
-
-        @Override
-        public Optional<V> load(K key) throws Exception {
-            byte[] keyBytes = serialize(key);
-            byte[] valBytes = rawMap.get(keyBytes);
-            if (valBytes == null) {
-                return Optional.absent();
-            }
-            V dev = deserialize(valBytes);
-            return Optional.of(dev);
-        }
-    }
-
     private final Logger log = getLogger(getClass());
 
     public static final String DEVICE_NOT_FOUND = "Device with ID %s not found";
 
     // FIXME Slice out types used in common to separate pool/namespace.
     private static final KryoPool POOL = KryoPool.newBuilder()
-            .register(URI.class, new URISerializer())
             .register(
                     ArrayList.class,
+                    HashMap.class,
 
-                    ProviderId.class,
                     Device.Type.class,
 
-                    DeviceId.class,
                     DefaultDevice.class,
                     MastershipRole.class,
-                    HashMap.class,
                     Port.class,
                     Element.class
                     )
+            .register(URI.class, new URISerializer())
+            .register(ProviderId.class, new ProviderIdSerializer())
+            .register(DeviceId.class, new DeviceIdSerializer())
             .register(PortNumber.class, new PortNumberSerializer())
             .register(DefaultPort.class, new DefaultPortSerializer())
             .build()
@@ -190,7 +117,7 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected StoreService storeService;
 
-    /*protected*/public HazelcastInstance theInstance;
+    protected HazelcastInstance theInstance;
 
 
     @Activate
@@ -517,4 +444,94 @@
         return POOL.deserialize(bytes);
     }
 
+    public static final class DeviceIdSerializer extends Serializer<DeviceId> {
+
+        @Override
+        public void write(Kryo kryo, Output output, DeviceId object) {
+            kryo.writeObject(output, object.uri());
+        }
+
+        @Override
+        public DeviceId read(Kryo kryo, Input input, Class<DeviceId> type) {
+            final URI uri = kryo.readObject(input, URI.class);
+            return DeviceId.deviceId(uri);
+        }
+    }
+
+    /**
+     * An IMap EntryListener, which reflects each remote event to cache.
+     *
+     * @param <K> IMap key type after deserialization
+     * @param <V> IMap value type after deserialization
+     */
+    public static final class RemoteEventHandler<K, V> extends
+            EntryAdapter<byte[], byte[]> {
+
+        private LoadingCache<K, Optional<V>> cache;
+
+        /**
+         * Constructor.
+         *
+         * @param cache cache to update
+         */
+        public RemoteEventHandler(
+                LoadingCache<K, Optional<V>> cache) {
+            this.cache = checkNotNull(cache);
+        }
+
+        @Override
+        public void mapCleared(MapEvent event) {
+            cache.invalidateAll();
+        }
+
+        @Override
+        public void entryUpdated(EntryEvent<byte[], byte[]> event) {
+            cache.put(POOL.<K>deserialize(event.getKey()),
+                        Optional.of(POOL.<V>deserialize(
+                                        event.getValue())));
+        }
+
+        @Override
+        public void entryRemoved(EntryEvent<byte[], byte[]> event) {
+            cache.invalidate(POOL.<DeviceId>deserialize(event.getKey()));
+        }
+
+        @Override
+        public void entryAdded(EntryEvent<byte[], byte[]> event) {
+            entryUpdated(event);
+        }
+    }
+
+    /**
+     * CacheLoader to wrap Map value with Optional,
+     * to handle negative hit on underlying IMap.
+     *
+     * @param <K> IMap key type after deserialization
+     * @param <V> IMap value type after deserialization
+     */
+    public static final class OptionalCacheLoader<K, V> extends
+            CacheLoader<K, Optional<V>> {
+
+        private IMap<byte[], byte[]> rawMap;
+
+        /**
+         * Constructor.
+         *
+         * @param rawMap underlying IMap
+         */
+        public OptionalCacheLoader(IMap<byte[], byte[]> rawMap) {
+            this.rawMap = checkNotNull(rawMap);
+        }
+
+        @Override
+        public Optional<V> load(K key) throws Exception {
+            byte[] keyBytes = serialize(key);
+            byte[] valBytes = rawMap.get(keyBytes);
+            if (valBytes == null) {
+                return Optional.absent();
+            }
+            V dev = deserialize(valBytes);
+            return Optional.of(dev);
+        }
+    }
 }
diff --git a/core/store/src/main/java/org/onlab/onos/store/device/impl/IpPrefixSerializer.java b/core/store/src/main/java/org/onlab/onos/store/device/impl/IpPrefixSerializer.java
index 3d3efe0..d6296a3 100644
--- a/core/store/src/main/java/org/onlab/onos/store/device/impl/IpPrefixSerializer.java
+++ b/core/store/src/main/java/org/onlab/onos/store/device/impl/IpPrefixSerializer.java
@@ -8,8 +8,14 @@
 import com.esotericsoftware.kryo.io.Output;
 
 // TODO move to util, etc.
+/**
+ * Kryo Serializer for {@link IpPrefix}.
+ */
 public final class IpPrefixSerializer extends Serializer<IpPrefix> {
 
+    /**
+     * Default constructor.
+     */
     public IpPrefixSerializer() {
         // non-null, immutable
         super(false, true);
diff --git a/core/store/src/main/java/org/onlab/onos/store/device/impl/PortNumberSerializer.java b/core/store/src/main/java/org/onlab/onos/store/device/impl/PortNumberSerializer.java
index 4483187..ae11867 100644
--- a/core/store/src/main/java/org/onlab/onos/store/device/impl/PortNumberSerializer.java
+++ b/core/store/src/main/java/org/onlab/onos/store/device/impl/PortNumberSerializer.java
@@ -8,9 +8,15 @@
 import com.esotericsoftware.kryo.io.Output;
 
 // TODO move to util, etc.
+/**
+ * Serializer for {@link PortNumber}.
+ */
 public final class PortNumberSerializer extends
         Serializer<PortNumber> {
 
+    /**
+     * Default constructor.
+     */
     public PortNumberSerializer() {
         // non-null, immutable
         super(false, true);
diff --git a/core/store/src/main/java/org/onlab/onos/store/device/impl/ProviderIdSerializer.java b/core/store/src/main/java/org/onlab/onos/store/device/impl/ProviderIdSerializer.java
new file mode 100644
index 0000000..82b7a70
--- /dev/null
+++ b/core/store/src/main/java/org/onlab/onos/store/device/impl/ProviderIdSerializer.java
@@ -0,0 +1,37 @@
+package org.onlab.onos.store.device.impl;
+
+import org.onlab.onos.net.provider.ProviderId;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.Serializer;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+
+//TODO move to util, etc.
+/**
+ * Serializer for {@link ProviderId}.
+ */
+public class ProviderIdSerializer extends Serializer<ProviderId> {
+
+    /**
+     * Default constructor.
+     */
+    public ProviderIdSerializer() {
+        // non-null, immutable
+        super(false, true);
+    }
+
+    @Override
+    public void write(Kryo kryo, Output output, ProviderId object) {
+        output.writeString(object.scheme());
+        output.writeString(object.id());
+    }
+
+    @Override
+    public ProviderId read(Kryo kryo, Input input, Class<ProviderId> type) {
+        String scheme = input.readString();
+        String id = input.readString();
+        return new ProviderId(scheme, id);
+    }
+
+}