import java.util.Map;
 import java.util.stream.Collectors;
 import org.apache.commons.collections.CollectionUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.onap.aai.domain.yang.Flavor;
 import org.onap.aai.domain.yang.Image;
 import org.onap.aai.domain.yang.PInterface;
         List<Relationship> relationships = relationshipList.getRelationship();
 
         // vserver to pserver relationship
-        Relationship pserverRelationship =
-                buildRelationship(HeatBridgeConstants.AAI_PSERVER, ImmutableMap.<String, String>builder()
-                        .put(HeatBridgeConstants.AAI_PSERVER_HOSTNAME, server.getHypervisorHostname()).build());
-        relationships.add(pserverRelationship);
-
+        if (!StringUtils.isEmpty(server.getHypervisorHostname())) {
+            Relationship pserverRelationship =
+                    buildRelationship(HeatBridgeConstants.AAI_PSERVER, ImmutableMap.<String, String>builder()
+                            .put(HeatBridgeConstants.AAI_PSERVER_HOSTNAME, server.getHypervisorHostname()).build());
+            relationships.add(pserverRelationship);
+        }
         // vserver to vf-module relationship
         Relationship vfModuleRelationship = buildRelationship(HeatBridgeConstants.AAI_VF_MODULE,
                 ImmutableMap.<String, String>builder().put(HeatBridgeConstants.AAI_GENERIC_VNF_ID, genericVnfId)
         }
 
         // vserver to flavor relationship
-        Relationship flavorRel = buildRelationship(HeatBridgeConstants.AAI_FLAVOR,
-                ImmutableMap.<String, String>builder().put(HeatBridgeConstants.AAI_CLOUD_OWNER, cloudOwner)
-                        .put(HeatBridgeConstants.AAI_CLOUD_REGION_ID, cloudRegionId)
-                        .put(HeatBridgeConstants.AAI_FLAVOR_ID, server.getFlavor().getId()).build());
-        relationships.add(flavorRel);
+        if (server.getFlavor() != null) {
+            Relationship flavorRel = buildRelationship(HeatBridgeConstants.AAI_FLAVOR,
+                    ImmutableMap.<String, String>builder().put(HeatBridgeConstants.AAI_CLOUD_OWNER, cloudOwner)
+                            .put(HeatBridgeConstants.AAI_CLOUD_REGION_ID, cloudRegionId)
+                            .put(HeatBridgeConstants.AAI_FLAVOR_ID, server.getFlavor().getId()).build());
+            relationships.add(flavorRel);
+        }
         return relationshipList;
     }
 
 
 import org.onap.so.client.graphinventory.exceptions.BulkProcessFailed;
 import org.onap.so.db.catalog.beans.CloudIdentity;
 import org.onap.so.heatbridge.constants.HeatBridgeConstants;
+import org.onap.so.heatbridge.helpers.AaiHelper;
 import org.onap.so.heatbridge.openstack.api.OpenstackClient;
 import org.onap.so.heatbridge.openstack.api.OpenstackClientException;
 import org.openstack4j.model.compute.Flavor;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.collect.ImmutableMap;
 
-
 @RunWith(MockitoJUnitRunner.class)
 public class HeatBridgeImplTest {
 
 
         Server server2 = mock(Server.class);
         when(server2.getId()).thenReturn("test-server2-id");
-        when(server2.getHypervisorHostname()).thenReturn("test-hypervisor");
+        when(server2.getHypervisorHostname()).thenReturn("");
         when(server2.getName()).thenReturn("test-server2-name");
         when(server2.getStatus()).thenReturn(Status.ACTIVE);
         when(server2.getLinks()).thenReturn(new ArrayList<>());
         when(server2.getFlavor()).thenReturn(flavor);
         when(flavor.getId()).thenReturn("test-flavor-id");
 
+        // Act
+        heatbridge.buildAddVserversToAaiAction("test-genericVnf-id", "test-vfModule-id", servers);
+
+        // Assert
+        ArgumentCaptor<AAIResourceUri> captor = ArgumentCaptor.forClass(AAIResourceUri.class);
+        verify(transaction, times(2)).create(captor.capture(), any(Vserver.class));
+
+        List<AAIResourceUri> uris = captor.getAllValues();
+        assertEquals(AAIUriFactory.createResourceUri(AAIObjectType.VSERVER, CLOUD_OWNER, REGION_ID, TENANT_ID,
+                server1.getId()), uris.get(0));
+        assertEquals(AAIUriFactory.createResourceUri(AAIObjectType.VSERVER, CLOUD_OWNER, REGION_ID, TENANT_ID,
+                server2.getId()), uris.get(1));
+
+    }
+
+    @Test
+    public void testUpdateVserversToAaiNoHypervisorName() throws HeatBridgeException {
+        // Arrange
+        Server server1 = mock(Server.class);
+
+        when(server1.getId()).thenReturn("test-server1-id");
+        when(server1.getHypervisorHostname()).thenReturn("");
+        when(server1.getName()).thenReturn("test-server1-name");
+        when(server1.getStatus()).thenReturn(Status.ACTIVE);
+        when(server1.getLinks()).thenReturn(new ArrayList<>());
+
+        Server server2 = mock(Server.class);
+        when(server2.getId()).thenReturn("test-server2-id");
+        when(server2.getName()).thenReturn("test-server2-name");
+        when(server2.getStatus()).thenReturn(Status.ACTIVE);
+        when(server2.getLinks()).thenReturn(new ArrayList<>());
+
+        List<Server> servers = Arrays.asList(server1, server2);
+
+        Image image = mock(Image.class);
+        when(server1.getImage()).thenReturn(image);
+        when(server2.getImage()).thenReturn(image);
+        when(image.getId()).thenReturn("test-image-id");
+
+        Flavor flavor = mock(Flavor.class);
+        when(server1.getFlavor()).thenReturn(flavor);
+        when(server2.getFlavor()).thenReturn(flavor);
+        when(flavor.getId()).thenReturn("test-flavor-id");
 
         // Act
         heatbridge.buildAddVserversToAaiAction("test-genericVnf-id", "test-vfModule-id", servers);
                 server1.getId()), uris.get(0));
         assertEquals(AAIUriFactory.createResourceUri(AAIObjectType.VSERVER, CLOUD_OWNER, REGION_ID, TENANT_ID,
                 server2.getId()), uris.get(1));
+    }
+
+    @Test
+    public void testCreateRelationships() throws HeatBridgeException {
+        AaiHelper aaiHelper = new AaiHelper();
+        // Arrange
+        Server server1 = mock(Server.class);
+
+        when(server1.getHypervisorHostname()).thenReturn("test-hypervisor");
+
+        // HypervisorHostname is not set
+        Server server2 = mock(Server.class);
+
+        // HypervisorHostname is empty string
+        Server server3 = mock(Server.class);
+        when(server3.getHypervisorHostname()).thenReturn("");
+
+        org.onap.aai.domain.yang.RelationshipList relList = aaiHelper.getVserverRelationshipList(CLOUD_OWNER, REGION_ID,
+                "test-genericVnf-id", "test-vfModule-id", server1);
+        assertEquals(2, relList.getRelationship().size());
+
+        org.onap.aai.domain.yang.RelationshipList relList2 = aaiHelper.getVserverRelationshipList(CLOUD_OWNER,
+                REGION_ID, "test-genericVnf-id", "test-vfModule-id", server2);
+        assertEquals(1, relList2.getRelationship().size());
 
+        org.onap.aai.domain.yang.RelationshipList relList3 = aaiHelper.getVserverRelationshipList(CLOUD_OWNER,
+                REGION_ID, "test-genericVnf-id", "test-vfModule-id", server3);
+        assertEquals(1, relList3.getRelationship().size());
     }
 
     @Test