diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AcceleratorTypeStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AcceleratorTypeStubSettings.java
index d29f00a0a695..099d5983abd9 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AcceleratorTypeStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AcceleratorTypeStubSettings.java
@@ -250,7 +250,9 @@ public String extractNextToken(AcceleratorTypeAggregatedList payload) {
             @Override
             public Iterable<AcceleratorTypesScopedList> extractResources(
                 AcceleratorTypeAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<AcceleratorTypesScopedList>of();
             }
           };
 
@@ -292,7 +294,9 @@ public String extractNextToken(AcceleratorTypeList payload) {
 
             @Override
             public Iterable<AcceleratorType> extractResources(AcceleratorTypeList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<AcceleratorType>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AddressStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AddressStubSettings.java
index e733e46cbb4f..b6f69e97dbd2 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AddressStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AddressStubSettings.java
@@ -258,7 +258,9 @@ public String extractNextToken(AddressAggregatedList payload) {
 
             @Override
             public Iterable<AddressesScopedList> extractResources(AddressAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<AddressesScopedList>of();
             }
           };
 
@@ -294,7 +296,9 @@ public String extractNextToken(AddressList payload) {
 
             @Override
             public Iterable<Address> extractResources(AddressList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Address>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AutoscalerStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AutoscalerStubSettings.java
index 4b0798f46bb4..e9c2f93ef490 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AutoscalerStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/AutoscalerStubSettings.java
@@ -278,7 +278,9 @@ public String extractNextToken(AutoscalerAggregatedList payload) {
             @Override
             public Iterable<AutoscalersScopedList> extractResources(
                 AutoscalerAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<AutoscalersScopedList>of();
             }
           };
 
@@ -314,7 +316,9 @@ public String extractNextToken(AutoscalerList payload) {
 
             @Override
             public Iterable<Autoscaler> extractResources(AutoscalerList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Autoscaler>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendBucketStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendBucketStubSettings.java
index 81d6c7ee2e92..22e4fe2f3e74 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendBucketStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendBucketStubSettings.java
@@ -288,7 +288,9 @@ public String extractNextToken(BackendBucketList payload) {
 
             @Override
             public Iterable<BackendBucket> extractResources(BackendBucketList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<BackendBucket>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendServiceStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendServiceStubSettings.java
index 070b57df28c1..2bb258460d52 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendServiceStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/BackendServiceStubSettings.java
@@ -335,7 +335,9 @@ public String extractNextToken(BackendServiceAggregatedList payload) {
             @Override
             public Iterable<BackendServicesScopedList> extractResources(
                 BackendServiceAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<BackendServicesScopedList>of();
             }
           };
 
@@ -375,7 +377,9 @@ public String extractNextToken(BackendServiceList payload) {
 
             @Override
             public Iterable<BackendService> extractResources(BackendServiceList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<BackendService>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskStubSettings.java
index fb9537e6e517..077821ff48a9 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskStubSettings.java
@@ -279,7 +279,9 @@ public String extractNextToken(DiskAggregatedList payload) {
 
             @Override
             public Iterable<DisksScopedList> extractResources(DiskAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<DisksScopedList>of();
             }
           };
 
@@ -313,7 +315,9 @@ public String extractNextToken(DiskList payload) {
 
             @Override
             public Iterable<Disk> extractResources(DiskList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Disk>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskTypeStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskTypeStubSettings.java
index 8cd7818f1c6e..6d4d6a414027 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskTypeStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/DiskTypeStubSettings.java
@@ -242,7 +242,9 @@ public String extractNextToken(DiskTypeAggregatedList payload) {
 
             @Override
             public Iterable<DiskTypesScopedList> extractResources(DiskTypeAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<DiskTypesScopedList>of();
             }
           };
 
@@ -278,7 +280,9 @@ public String extractNextToken(DiskTypeList payload) {
 
             @Override
             public Iterable<DiskType> extractResources(DiskTypeList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<DiskType>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/FirewallStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/FirewallStubSettings.java
index 9e7af23a14f8..a8c19ccd8a02 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/FirewallStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/FirewallStubSettings.java
@@ -252,7 +252,9 @@ public String extractNextToken(FirewallList payload) {
 
             @Override
             public Iterable<Firewall> extractResources(FirewallList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Firewall>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ForwardingRuleStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ForwardingRuleStubSettings.java
index 81707a48cd42..ed7877683728 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ForwardingRuleStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ForwardingRuleStubSettings.java
@@ -281,7 +281,9 @@ public String extractNextToken(ForwardingRuleAggregatedList payload) {
             @Override
             public Iterable<ForwardingRulesScopedList> extractResources(
                 ForwardingRuleAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<ForwardingRulesScopedList>of();
             }
           };
 
@@ -321,7 +323,9 @@ public String extractNextToken(ForwardingRuleList payload) {
 
             @Override
             public Iterable<ForwardingRule> extractResources(ForwardingRuleList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<ForwardingRule>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalAddressStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalAddressStubSettings.java
index 409943639634..e0b77e17371b 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalAddressStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalAddressStubSettings.java
@@ -244,7 +244,9 @@ public String extractNextToken(AddressList payload) {
 
             @Override
             public Iterable<Address> extractResources(AddressList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Address>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalForwardingRuleStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalForwardingRuleStubSettings.java
index 019b57dfeb79..77c2a0707107 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalForwardingRuleStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalForwardingRuleStubSettings.java
@@ -266,7 +266,9 @@ public String extractNextToken(ForwardingRuleList payload) {
 
             @Override
             public Iterable<ForwardingRule> extractResources(ForwardingRuleList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<ForwardingRule>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalOperationStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalOperationStubSettings.java
index 8dfeea1ad6b0..7b52e7d92180 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalOperationStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/GlobalOperationStubSettings.java
@@ -257,7 +257,9 @@ public String extractNextToken(OperationAggregatedList payload) {
             @Override
             public Iterable<OperationsScopedList> extractResources(
                 OperationAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<OperationsScopedList>of();
             }
           };
 
@@ -298,7 +300,9 @@ public String extractNextToken(OperationList payload) {
 
             @Override
             public Iterable<Operation> extractResources(OperationList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Operation>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HealthCheckStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HealthCheckStubSettings.java
index 11cdb64541fa..a31d115f77f6 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HealthCheckStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HealthCheckStubSettings.java
@@ -260,7 +260,9 @@ public String extractNextToken(HealthCheckList payload) {
 
             @Override
             public Iterable<HealthCheck> extractResources(HealthCheckList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<HealthCheck>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpHealthCheckStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpHealthCheckStubSettings.java
index 6ce448ba8aed..3187e71da07e 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpHealthCheckStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpHealthCheckStubSettings.java
@@ -270,7 +270,9 @@ public String extractNextToken(HttpHealthCheckList payload) {
 
             @Override
             public Iterable<HttpHealthCheck2> extractResources(HttpHealthCheckList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<HttpHealthCheck2>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpsHealthCheckStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpsHealthCheckStubSettings.java
index e32cc939ca47..5383e0566c3f 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpsHealthCheckStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/HttpsHealthCheckStubSettings.java
@@ -272,7 +272,9 @@ public String extractNextToken(HttpsHealthCheckList payload) {
 
             @Override
             public Iterable<HttpsHealthCheck2> extractResources(HttpsHealthCheckList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<HttpsHealthCheck2>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ImageStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ImageStubSettings.java
index 79e43f7cad0b..e3c32ae4c562 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ImageStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ImageStubSettings.java
@@ -258,7 +258,9 @@ public String extractNextToken(ImageList payload) {
 
             @Override
             public Iterable<Image> extractResources(ImageList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Image>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceGroupManagerStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceGroupManagerStubSettings.java
index 44a165ecc5c1..9fff6f166fc6 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceGroupManagerStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceGroupManagerStubSettings.java
@@ -367,7 +367,9 @@ public String extractNextToken(InstanceGroupManagerAggregatedList payload) {
             @Override
             public Iterable<InstanceGroupManagersScopedList> extractResources(
                 InstanceGroupManagerAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<InstanceGroupManagersScopedList>of();
             }
           };
 
@@ -411,7 +413,9 @@ public String extractNextToken(InstanceGroupManagerList payload) {
             @Override
             public Iterable<InstanceGroupManager> extractResources(
                 InstanceGroupManagerList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InstanceGroupManager>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceGroupStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceGroupStubSettings.java
index 320cad8331f7..67f82374265e 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceGroupStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceGroupStubSettings.java
@@ -320,7 +320,9 @@ public String extractNextToken(InstanceGroupAggregatedList payload) {
             @Override
             public Iterable<InstanceGroupsScopedList> extractResources(
                 InstanceGroupAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<InstanceGroupsScopedList>of();
             }
           };
 
@@ -360,7 +362,9 @@ public String extractNextToken(InstanceGroupList payload) {
 
             @Override
             public Iterable<InstanceGroup> extractResources(InstanceGroupList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InstanceGroup>of();
             }
           };
 
@@ -405,7 +409,9 @@ public String extractNextToken(InstanceGroupsListInstances payload) {
             @Override
             public Iterable<InstanceWithNamedPorts> extractResources(
                 InstanceGroupsListInstances payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InstanceWithNamedPorts>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceStubSettings.java
index c061f6f268ee..7e3ce14f64aa 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceStubSettings.java
@@ -494,7 +494,9 @@ public String extractNextToken(InstanceAggregatedList payload) {
 
             @Override
             public Iterable<InstancesScopedList> extractResources(InstanceAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<InstancesScopedList>of();
             }
           };
 
@@ -530,7 +532,9 @@ public String extractNextToken(InstanceList payload) {
 
             @Override
             public Iterable<Instance> extractResources(InstanceList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Instance>of();
             }
           };
 
@@ -572,7 +576,9 @@ public String extractNextToken(InstanceListReferrers payload) {
 
             @Override
             public Iterable<Reference> extractResources(InstanceListReferrers payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Reference>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceTemplateStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceTemplateStubSettings.java
index 819de6dde783..e0fab0744c17 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceTemplateStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InstanceTemplateStubSettings.java
@@ -252,7 +252,9 @@ public String extractNextToken(InstanceTemplateList payload) {
 
             @Override
             public Iterable<InstanceTemplate> extractResources(InstanceTemplateList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InstanceTemplate>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectAttachmentStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectAttachmentStubSettings.java
index 8721864b995e..d06aaa591cb3 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectAttachmentStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectAttachmentStubSettings.java
@@ -291,7 +291,9 @@ public String extractNextToken(InterconnectAttachmentAggregatedList payload) {
             @Override
             public Iterable<InterconnectAttachmentsScopedList> extractResources(
                 InterconnectAttachmentAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<InterconnectAttachmentsScopedList>of();
             }
           };
 
@@ -336,7 +338,9 @@ public String extractNextToken(InterconnectAttachmentList payload) {
             @Override
             public Iterable<InterconnectAttachment> extractResources(
                 InterconnectAttachmentList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InterconnectAttachment>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectLocationStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectLocationStubSettings.java
index 2d8929b980de..fabb6e5f9de7 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectLocationStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectLocationStubSettings.java
@@ -234,7 +234,9 @@ public String extractNextToken(InterconnectLocationList payload) {
             @Override
             public Iterable<InterconnectLocation> extractResources(
                 InterconnectLocationList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InterconnectLocation>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectStubSettings.java
index 7f7d7d43ee8a..5f6cdf330cda 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/InterconnectStubSettings.java
@@ -252,7 +252,9 @@ public String extractNextToken(InterconnectList payload) {
 
             @Override
             public Iterable<Interconnect> extractResources(InterconnectList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Interconnect>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/LicenseStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/LicenseStubSettings.java
index 1fc3748ed609..e5593a950bb0 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/LicenseStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/LicenseStubSettings.java
@@ -247,7 +247,9 @@ public String extractNextToken(LicensesListResponse payload) {
 
             @Override
             public Iterable<License> extractResources(LicensesListResponse payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<License>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/MachineTypeStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/MachineTypeStubSettings.java
index fdd22baca8b8..67399ce3b07b 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/MachineTypeStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/MachineTypeStubSettings.java
@@ -247,7 +247,9 @@ public String extractNextToken(MachineTypeAggregatedList payload) {
             @Override
             public Iterable<MachineTypesScopedList> extractResources(
                 MachineTypeAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<MachineTypesScopedList>of();
             }
           };
 
@@ -286,7 +288,9 @@ public String extractNextToken(MachineTypeList payload) {
 
             @Override
             public Iterable<MachineType> extractResources(MachineTypeList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<MachineType>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NetworkStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NetworkStubSettings.java
index e025cedc2c13..900d2f55491f 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NetworkStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NetworkStubSettings.java
@@ -272,7 +272,9 @@ public String extractNextToken(NetworkList payload) {
 
             @Override
             public Iterable<Network> extractResources(NetworkList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Network>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeGroupStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeGroupStubSettings.java
index 552a430f9178..c847ad3b3c99 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeGroupStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeGroupStubSettings.java
@@ -305,7 +305,9 @@ public String extractNextToken(NodeGroupAggregatedList payload) {
             @Override
             public Iterable<NodeGroupsScopedList> extractResources(
                 NodeGroupAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<NodeGroupsScopedList>of();
             }
           };
 
@@ -341,7 +343,9 @@ public String extractNextToken(NodeGroupList payload) {
 
             @Override
             public Iterable<NodeGroup> extractResources(NodeGroupList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<NodeGroup>of();
             }
           };
 
@@ -381,7 +385,9 @@ public String extractNextToken(NodeGroupsListNodes payload) {
 
             @Override
             public Iterable<NodeGroupNode> extractResources(NodeGroupsListNodes payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<NodeGroupNode>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeTemplateStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeTemplateStubSettings.java
index 61b0a8f3999a..211e6ad7a603 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeTemplateStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeTemplateStubSettings.java
@@ -267,7 +267,9 @@ public String extractNextToken(NodeTemplateAggregatedList payload) {
             @Override
             public Iterable<NodeTemplatesScopedList> extractResources(
                 NodeTemplateAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<NodeTemplatesScopedList>of();
             }
           };
 
@@ -306,7 +308,9 @@ public String extractNextToken(NodeTemplateList payload) {
 
             @Override
             public Iterable<NodeTemplate> extractResources(NodeTemplateList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<NodeTemplate>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeTypeStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeTypeStubSettings.java
index bb7f94471a27..64a788ed5d72 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeTypeStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/NodeTypeStubSettings.java
@@ -242,7 +242,9 @@ public String extractNextToken(NodeTypeAggregatedList payload) {
 
             @Override
             public Iterable<NodeTypesScopedList> extractResources(NodeTypeAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<NodeTypesScopedList>of();
             }
           };
 
@@ -278,7 +280,9 @@ public String extractNextToken(NodeTypeList payload) {
 
             @Override
             public Iterable<NodeType> extractResources(NodeTypeList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<NodeType>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ProjectStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ProjectStubSettings.java
index f5e5a246ddc6..77970912150b 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ProjectStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ProjectStubSettings.java
@@ -343,7 +343,9 @@ public String extractNextToken(ProjectsGetXpnResources payload) {
 
             @Override
             public Iterable<XpnResourceId> extractResources(ProjectsGetXpnResources payload) {
-              return payload.getResourcesList();
+              return payload.getResourcesList() != null
+                  ? payload.getResourcesList()
+                  : ImmutableList.<XpnResourceId>of();
             }
           };
 
@@ -383,7 +385,9 @@ public String extractNextToken(XpnHostList payload) {
 
             @Override
             public Iterable<Project> extractResources(XpnHostList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Project>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionAutoscalerStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionAutoscalerStubSettings.java
index 4e81bac5cdc1..70a37d30458b 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionAutoscalerStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionAutoscalerStubSettings.java
@@ -272,7 +272,9 @@ public String extractNextToken(RegionAutoscalerList payload) {
 
             @Override
             public Iterable<Autoscaler> extractResources(RegionAutoscalerList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Autoscaler>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionBackendServiceStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionBackendServiceStubSettings.java
index 46aca507d5a1..355ccbb9093a 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionBackendServiceStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionBackendServiceStubSettings.java
@@ -289,7 +289,9 @@ public String extractNextToken(BackendServiceList payload) {
 
             @Override
             public Iterable<BackendService> extractResources(BackendServiceList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<BackendService>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionCommitmentStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionCommitmentStubSettings.java
index 4f93e74feedc..9d402966b895 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionCommitmentStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionCommitmentStubSettings.java
@@ -261,7 +261,9 @@ public String extractNextToken(CommitmentAggregatedList payload) {
             @Override
             public Iterable<CommitmentsScopedList> extractResources(
                 CommitmentAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<CommitmentsScopedList>of();
             }
           };
 
@@ -302,7 +304,9 @@ public String extractNextToken(CommitmentList payload) {
 
             @Override
             public Iterable<Commitment> extractResources(CommitmentList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Commitment>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionDiskStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionDiskStubSettings.java
index b2f9119eff36..60d74ec4f644 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionDiskStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionDiskStubSettings.java
@@ -277,7 +277,9 @@ public String extractNextToken(DiskList payload) {
 
             @Override
             public Iterable<Disk> extractResources(DiskList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Disk>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionDiskTypeStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionDiskTypeStubSettings.java
index 05f773d9ef49..8bbd57201f52 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionDiskTypeStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionDiskTypeStubSettings.java
@@ -224,7 +224,9 @@ public String extractNextToken(RegionDiskTypeList payload) {
 
             @Override
             public Iterable<DiskType> extractResources(RegionDiskTypeList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<DiskType>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionInstanceGroupManagerStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionInstanceGroupManagerStubSettings.java
index 601d37d866fa..86b2b3d309d9 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionInstanceGroupManagerStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionInstanceGroupManagerStubSettings.java
@@ -361,7 +361,9 @@ public String extractNextToken(RegionInstanceGroupManagerList payload) {
             @Override
             public Iterable<InstanceGroupManager> extractResources(
                 RegionInstanceGroupManagerList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InstanceGroupManager>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionInstanceGroupStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionInstanceGroupStubSettings.java
index 17d4c0d42d97..e38683be254f 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionInstanceGroupStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionInstanceGroupStubSettings.java
@@ -261,7 +261,9 @@ public String extractNextToken(RegionInstanceGroupList payload) {
 
             @Override
             public Iterable<InstanceGroup> extractResources(RegionInstanceGroupList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InstanceGroup>of();
             }
           };
 
@@ -306,7 +308,9 @@ public String extractNextToken(RegionInstanceGroupsListInstances payload) {
             @Override
             public Iterable<InstanceWithNamedPorts> extractResources(
                 RegionInstanceGroupsListInstances payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<InstanceWithNamedPorts>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionOperationStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionOperationStubSettings.java
index 270ec87bf321..bf56763152c7 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionOperationStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionOperationStubSettings.java
@@ -236,7 +236,9 @@ public String extractNextToken(OperationList payload) {
 
             @Override
             public Iterable<Operation> extractResources(OperationList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Operation>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionStubSettings.java
index 45044fc42d3a..6768a9123426 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RegionStubSettings.java
@@ -218,7 +218,9 @@ public String extractNextToken(RegionList payload) {
 
             @Override
             public Iterable<Region> extractResources(RegionList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Region>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RouteStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RouteStubSettings.java
index f37082e4f972..5aeabc21a44b 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RouteStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RouteStubSettings.java
@@ -234,7 +234,9 @@ public String extractNextToken(RouteList payload) {
 
             @Override
             public Iterable<Route> extractResources(RouteList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Route>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RouterStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RouterStubSettings.java
index 1c379f2dc19a..d513b97d8473 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RouterStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/RouterStubSettings.java
@@ -296,7 +296,9 @@ public String extractNextToken(RouterAggregatedList payload) {
 
             @Override
             public Iterable<RoutersScopedList> extractResources(RouterAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<RoutersScopedList>of();
             }
           };
 
@@ -332,7 +334,9 @@ public String extractNextToken(RouterList payload) {
 
             @Override
             public Iterable<Router> extractResources(RouterList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Router>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SecurityPolicyStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SecurityPolicyStubSettings.java
index 1244eca214d6..290ff2eb0410 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SecurityPolicyStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SecurityPolicyStubSettings.java
@@ -301,7 +301,9 @@ public String extractNextToken(SecurityPolicyList payload) {
 
             @Override
             public Iterable<SecurityPolicy> extractResources(SecurityPolicyList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<SecurityPolicy>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SnapshotStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SnapshotStubSettings.java
index a7646118c60d..4139d24dcb11 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SnapshotStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SnapshotStubSettings.java
@@ -237,7 +237,9 @@ public String extractNextToken(SnapshotList payload) {
 
             @Override
             public Iterable<Snapshot> extractResources(SnapshotList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Snapshot>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SslCertificateStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SslCertificateStubSettings.java
index fe0cf6eafb07..f1ac3b87aa72 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SslCertificateStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SslCertificateStubSettings.java
@@ -248,7 +248,9 @@ public String extractNextToken(SslCertificateList payload) {
 
             @Override
             public Iterable<SslCertificate> extractResources(SslCertificateList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<SslCertificate>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SslPolicyStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SslPolicyStubSettings.java
index 48096607a206..501adab34abb 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SslPolicyStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SslPolicyStubSettings.java
@@ -259,7 +259,9 @@ public String extractNextToken(SslPoliciesList payload) {
 
             @Override
             public Iterable<SslPolicy> extractResources(SslPoliciesList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<SslPolicy>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SubnetworkStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SubnetworkStubSettings.java
index 3a57b4df4fa9..a932375cfb86 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SubnetworkStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/SubnetworkStubSettings.java
@@ -309,7 +309,9 @@ public String extractNextToken(SubnetworkAggregatedList payload) {
             @Override
             public Iterable<SubnetworksScopedList> extractResources(
                 SubnetworkAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<SubnetworksScopedList>of();
             }
           };
 
@@ -345,7 +347,9 @@ public String extractNextToken(SubnetworkList payload) {
 
             @Override
             public Iterable<Subnetwork> extractResources(SubnetworkList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Subnetwork>of();
             }
           };
 
@@ -389,7 +393,9 @@ public String extractNextToken(UsableSubnetworksAggregatedList payload) {
             @Override
             public Iterable<UsableSubnetwork> extractResources(
                 UsableSubnetworksAggregatedList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<UsableSubnetwork>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetHttpProxyStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetHttpProxyStubSettings.java
index adf9b921b5dd..e877db9c7c74 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetHttpProxyStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetHttpProxyStubSettings.java
@@ -260,7 +260,9 @@ public String extractNextToken(TargetHttpProxyList payload) {
 
             @Override
             public Iterable<TargetHttpProxy> extractResources(TargetHttpProxyList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<TargetHttpProxy>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetHttpsProxyStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetHttpsProxyStubSettings.java
index c006b8b28df4..788d33478ae4 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetHttpsProxyStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetHttpsProxyStubSettings.java
@@ -295,7 +295,9 @@ public String extractNextToken(TargetHttpsProxyList payload) {
 
             @Override
             public Iterable<TargetHttpsProxy> extractResources(TargetHttpsProxyList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<TargetHttpsProxy>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetInstanceStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetInstanceStubSettings.java
index 4ada09b98847..0345621f5879 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetInstanceStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetInstanceStubSettings.java
@@ -271,7 +271,9 @@ public String extractNextToken(TargetInstanceAggregatedList payload) {
             @Override
             public Iterable<TargetInstancesScopedList> extractResources(
                 TargetInstanceAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<TargetInstancesScopedList>of();
             }
           };
 
@@ -311,7 +313,9 @@ public String extractNextToken(TargetInstanceList payload) {
 
             @Override
             public Iterable<TargetInstance> extractResources(TargetInstanceList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<TargetInstance>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetPoolStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetPoolStubSettings.java
index 239def189ab1..1a4293a01143 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetPoolStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetPoolStubSettings.java
@@ -324,7 +324,9 @@ public String extractNextToken(TargetPoolAggregatedList payload) {
             @Override
             public Iterable<TargetPoolsScopedList> extractResources(
                 TargetPoolAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<TargetPoolsScopedList>of();
             }
           };
 
@@ -360,7 +362,9 @@ public String extractNextToken(TargetPoolList payload) {
 
             @Override
             public Iterable<TargetPool> extractResources(TargetPoolList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<TargetPool>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetSslProxyStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetSslProxyStubSettings.java
index 1b9d9d804bce..99cd6a9cbf27 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetSslProxyStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetSslProxyStubSettings.java
@@ -294,7 +294,9 @@ public String extractNextToken(TargetSslProxyList payload) {
 
             @Override
             public Iterable<TargetSslProxy> extractResources(TargetSslProxyList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<TargetSslProxy>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetTcpProxyStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetTcpProxyStubSettings.java
index 211cb213e68e..b9e1ffaca8ae 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetTcpProxyStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetTcpProxyStubSettings.java
@@ -272,7 +272,9 @@ public String extractNextToken(TargetTcpProxyList payload) {
 
             @Override
             public Iterable<TargetTcpProxy> extractResources(TargetTcpProxyList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<TargetTcpProxy>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetVpnGatewayStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetVpnGatewayStubSettings.java
index c25b3c56abdf..3b7e08cf76b8 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetVpnGatewayStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/TargetVpnGatewayStubSettings.java
@@ -273,7 +273,9 @@ public String extractNextToken(TargetVpnGatewayAggregatedList payload) {
             @Override
             public Iterable<TargetVpnGatewaysScopedList> extractResources(
                 TargetVpnGatewayAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<TargetVpnGatewaysScopedList>of();
             }
           };
 
@@ -315,7 +317,9 @@ public String extractNextToken(TargetVpnGatewayList payload) {
 
             @Override
             public Iterable<TargetVpnGateway> extractResources(TargetVpnGatewayList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<TargetVpnGateway>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/UrlMapStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/UrlMapStubSettings.java
index 9be5fe064fb2..6127ec98aca7 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/UrlMapStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/UrlMapStubSettings.java
@@ -272,7 +272,9 @@ public String extractNextToken(UrlMapList payload) {
 
             @Override
             public Iterable<UrlMap> extractResources(UrlMapList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<UrlMap>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/VpnTunnelStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/VpnTunnelStubSettings.java
index e62fa9c01226..73223955caab 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/VpnTunnelStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/VpnTunnelStubSettings.java
@@ -261,7 +261,9 @@ public String extractNextToken(VpnTunnelAggregatedList payload) {
             @Override
             public Iterable<VpnTunnelsScopedList> extractResources(
                 VpnTunnelAggregatedList payload) {
-              return payload.getItemsMap().values();
+              return payload.getItemsMap() != null
+                  ? payload.getItemsMap().values()
+                  : ImmutableList.<VpnTunnelsScopedList>of();
             }
           };
 
@@ -297,7 +299,9 @@ public String extractNextToken(VpnTunnelList payload) {
 
             @Override
             public Iterable<VpnTunnel> extractResources(VpnTunnelList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<VpnTunnel>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ZoneOperationStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ZoneOperationStubSettings.java
index dc9421bdf3c9..cb5d1499bd1d 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ZoneOperationStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ZoneOperationStubSettings.java
@@ -231,7 +231,9 @@ public String extractNextToken(OperationList payload) {
 
             @Override
             public Iterable<Operation> extractResources(OperationList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Operation>of();
             }
           };
 
diff --git a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ZoneStubSettings.java b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ZoneStubSettings.java
index cf5ac03aa4e0..b797979493ef 100644
--- a/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ZoneStubSettings.java
+++ b/google-cloud-clients/google-cloud-compute/src/main/java/com/google/cloud/compute/v1/stub/ZoneStubSettings.java
@@ -216,7 +216,9 @@ public String extractNextToken(ZoneList payload) {
 
             @Override
             public Iterable<Zone> extractResources(ZoneList payload) {
-              return payload.getItemsList();
+              return payload.getItemsList() != null
+                  ? payload.getItemsList()
+                  : ImmutableList.<Zone>of();
             }
           };