diff --git a/apps/xosclient/src/main/java/org/onosproject/xosclient/api/VtnServiceId.java b/apps/xosclient/src/main/java/org/onosproject/xosclient/api/VtnServiceId.java
index 6fc4a43..2f12850 100644
--- a/apps/xosclient/src/main/java/org/onosproject/xosclient/api/VtnServiceId.java
+++ b/apps/xosclient/src/main/java/org/onosproject/xosclient/api/VtnServiceId.java
@@ -23,6 +23,7 @@
 /**
  * Representation of VTN service identifier.
  */
+
 public final class VtnServiceId extends Identifier<String> {
     /**
      * Default constructor.
diff --git a/core/api/src/main/java/org/onosproject/cluster/NodeId.java b/core/api/src/main/java/org/onosproject/cluster/NodeId.java
index d4c4c2e..80e94dc 100644
--- a/core/api/src/main/java/org/onosproject/cluster/NodeId.java
+++ b/core/api/src/main/java/org/onosproject/cluster/NodeId.java
@@ -17,11 +17,15 @@
 
 import org.onlab.util.Identifier;
 
+import static com.google.common.base.Preconditions.checkArgument;
+
 /**
  * Controller cluster identity.
  */
 public final class NodeId extends Identifier<String> implements Comparable<NodeId> {
 
+    private static final int ID_MAX_LENGTH = 1024;
+
     /**
      * Constructor for serialization.
      */
@@ -36,6 +40,7 @@
      */
     public NodeId(String id) {
         super(id);
+        checkArgument(id.length() <= ID_MAX_LENGTH, "id exceeds maximum length " + ID_MAX_LENGTH);
     }
 
     /**
diff --git a/core/api/src/main/java/org/onosproject/core/DefaultApplicationId.java b/core/api/src/main/java/org/onosproject/core/DefaultApplicationId.java
index ef46bf2..71e3a3a 100644
--- a/core/api/src/main/java/org/onosproject/core/DefaultApplicationId.java
+++ b/core/api/src/main/java/org/onosproject/core/DefaultApplicationId.java
@@ -25,6 +25,7 @@
  */
 public class DefaultApplicationId implements ApplicationId {
 
+    private static final int NAME_MAX_LENGTH = 1024;
     private final short id;
     private final String name;
 
@@ -36,6 +37,9 @@
      */
     public DefaultApplicationId(int id, String name) {
         checkArgument(0 <= id && id <= Short.MAX_VALUE, "id is outside range");
+        if (name != null) {
+            checkArgument(name.length() <= NAME_MAX_LENGTH, "name exceeds maximum length " + NAME_MAX_LENGTH);
+        }
         this.id = (short) id;
         this.name = name;
     }
diff --git a/core/api/src/main/java/org/onosproject/net/DefaultDevice.java b/core/api/src/main/java/org/onosproject/net/DefaultDevice.java
index b5e6a16..522e8f9 100644
--- a/core/api/src/main/java/org/onosproject/net/DefaultDevice.java
+++ b/core/api/src/main/java/org/onosproject/net/DefaultDevice.java
@@ -26,12 +26,18 @@
 import java.util.Objects;
 
 import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Preconditions.checkArgument;
 
 /**
  * Default infrastructure device model implementation.
  */
 public class DefaultDevice extends AbstractElement implements Device {
 
+    private static final int MANUFACTURER_MAX_LENGTH = 256;
+    private static final int HW_VERSION_MAX_LENGTH = 256;
+    private static final int SW_VERSION_MAX_LENGTH = 256;
+    private static final int SERIAL_NUMBER_MAX_LENGTH = 256;
+
     private final Type type;
     private final String manufacturer;
     private final String serialNumber;
@@ -67,6 +73,22 @@
                          String serialNumber, ChassisId chassisId,
                          Annotations... annotations) {
         super(providerId, id, annotations);
+        if (hwVersion != null) {
+            checkArgument(hwVersion.length() <= HW_VERSION_MAX_LENGTH,
+                    "hwVersion exceeds maximum length " + HW_VERSION_MAX_LENGTH);
+        }
+        if (swVersion != null) {
+            checkArgument(swVersion.length() <= SW_VERSION_MAX_LENGTH,
+                    "swVersion exceeds maximum length " + SW_VERSION_MAX_LENGTH);
+        }
+        if (manufacturer != null) {
+            checkArgument(manufacturer.length() <= MANUFACTURER_MAX_LENGTH,
+                    "manufacturer exceeds maximum length " + MANUFACTURER_MAX_LENGTH);
+        }
+        if (serialNumber != null) {
+            checkArgument(serialNumber.length() <= SERIAL_NUMBER_MAX_LENGTH,
+                    "serialNumber exceeds maximum length " + SERIAL_NUMBER_MAX_LENGTH);
+        }
         this.type = type;
         this.manufacturer = manufacturer;
         this.hwVersion = hwVersion;
diff --git a/core/api/src/main/java/org/onosproject/net/DeviceId.java b/core/api/src/main/java/org/onosproject/net/DeviceId.java
index e7b13f7..09b427b 100644
--- a/core/api/src/main/java/org/onosproject/net/DeviceId.java
+++ b/core/api/src/main/java/org/onosproject/net/DeviceId.java
@@ -18,6 +18,8 @@
 import java.net.URI;
 import java.util.Objects;
 
+import static com.google.common.base.Preconditions.checkArgument;
+
 /**
  * Immutable representation of a device identity.
  */
@@ -28,6 +30,8 @@
      */
     public static final DeviceId NONE = deviceId("none:none");
 
+    private static final int DEVICE_ID_MAX_LENGTH = 1024;
+
     private final URI uri;
     private final String str;
 
@@ -61,6 +65,8 @@
      * @return DeviceId
      */
     public static DeviceId deviceId(String string) {
+        checkArgument(string.length() <= DEVICE_ID_MAX_LENGTH,
+                "deviceId exceeds maximum length " + DEVICE_ID_MAX_LENGTH);
         return deviceId(URI.create(string));
     }
 
diff --git a/core/api/src/main/java/org/onosproject/net/key/DeviceKey.java b/core/api/src/main/java/org/onosproject/net/key/DeviceKey.java
index 4677cc7..8122bd0 100644
--- a/core/api/src/main/java/org/onosproject/net/key/DeviceKey.java
+++ b/core/api/src/main/java/org/onosproject/net/key/DeviceKey.java
@@ -22,6 +22,7 @@
 import org.onosproject.net.Annotations;
 import org.onosproject.net.DefaultAnnotations;
 
+import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.base.Preconditions.checkState;
 import static org.onosproject.net.DefaultAnnotations.builder;
@@ -32,6 +33,8 @@
 @Beta
 public class DeviceKey extends AbstractAnnotated {
 
+    private static final int LABEL_MAX_LENGTH = 1024;
+
     // device key identifier
     private final DeviceKeyId deviceKeyId;
     // label of the device key
@@ -66,6 +69,9 @@
     private DeviceKey(DeviceKeyId id, String label, Type type, Annotations... annotations) {
         super(annotations);
         checkNotNull(id, "The DeviceKeyId cannot be null.");
+        if (label != null) {
+            checkArgument(label.length() <= LABEL_MAX_LENGTH, "label exceeds maximum length " + LABEL_MAX_LENGTH);
+        }
         this.deviceKeyId = id;
         this.label = label;
         this.type = type;
diff --git a/core/api/src/main/java/org/onosproject/net/key/DeviceKeyId.java b/core/api/src/main/java/org/onosproject/net/key/DeviceKeyId.java
index ad401a1..6339e38 100644
--- a/core/api/src/main/java/org/onosproject/net/key/DeviceKeyId.java
+++ b/core/api/src/main/java/org/onosproject/net/key/DeviceKeyId.java
@@ -18,11 +18,15 @@
 
 import org.onlab.util.Identifier;
 
+import static com.google.common.base.Preconditions.checkArgument;
+
 /**
  * Device key identifier backed by a string value.
  */
 public final class DeviceKeyId extends Identifier<String> {
 
+    private static final int ID_MAX_LENGTH = 1024;
+
     /**
      * Constructor for serialization.
      */
@@ -46,6 +50,9 @@
      * @return device key identifier
      */
     public static DeviceKeyId deviceKeyId(String id) {
+        if (id != null) {
+            checkArgument(id.length() <= ID_MAX_LENGTH, "id exceeds maximum length " + ID_MAX_LENGTH);
+        }
         return new DeviceKeyId(id);
     }
 
diff --git a/core/api/src/main/java/org/onosproject/net/region/DefaultRegion.java b/core/api/src/main/java/org/onosproject/net/region/DefaultRegion.java
index d229e92..de1e04c 100644
--- a/core/api/src/main/java/org/onosproject/net/region/DefaultRegion.java
+++ b/core/api/src/main/java/org/onosproject/net/region/DefaultRegion.java
@@ -26,11 +26,15 @@
 import java.util.Objects;
 import java.util.Set;
 
+import static com.google.common.base.Preconditions.checkArgument;
+
 /**
  * Default implementation of a region.
  */
 public final class DefaultRegion extends AbstractAnnotated implements Region {
 
+    private static final int NAME_MAX_LENGTH = 1024;
+
     private final RegionId id;
     private final String name;
     private final Type type;
@@ -52,6 +56,9 @@
         this.name = name;
         this.type = type;
         this.masters = masters != null ? ImmutableList.copyOf(masters) : ImmutableList.of();
+        if (name != null) {
+            checkArgument(name.length() <= NAME_MAX_LENGTH, "name exceeds maximum length " + NAME_MAX_LENGTH);
+        }
     }
 
     @Override
diff --git a/core/api/src/main/java/org/onosproject/net/region/RegionId.java b/core/api/src/main/java/org/onosproject/net/region/RegionId.java
index 903d014..03cbc9c 100644
--- a/core/api/src/main/java/org/onosproject/net/region/RegionId.java
+++ b/core/api/src/main/java/org/onosproject/net/region/RegionId.java
@@ -18,11 +18,15 @@
 
 import org.onlab.util.Identifier;
 
+import static com.google.common.base.Preconditions.checkArgument;
+
 /**
  * Region identifier backed by a string value.
  */
 public final class RegionId extends Identifier<String> {
 
+    private static final int REGION_MAX_LENGTH = 1024;
+
     /**
      * Constructor for serialization.
      */
@@ -37,6 +41,9 @@
      */
     private RegionId(String value) {
         super(value);
+        if (value != null) {
+            checkArgument(value.length() <= REGION_MAX_LENGTH, "value exceeds maximum length " + REGION_MAX_LENGTH);
+        }
     }
 
     /**