diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/CreateHubRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/CreateHubRequest.java
index bf5bf35c..83b3ee48 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/CreateHubRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/CreateHubRequest.java
@@ -382,16 +382,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getHubIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(hubId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, hubId_);
     }
     if (hub_ != null) {
       output.writeMessage(3, getHub());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, requestId_);
     }
     unknownFields.writeTo(output);
@@ -403,16 +403,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getHubIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(hubId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, hubId_);
     }
     if (hub_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getHub());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/CreateSpokeRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/CreateSpokeRequest.java
index 954ebf72..bc050106 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/CreateSpokeRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/CreateSpokeRequest.java
@@ -384,16 +384,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getSpokeIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(spokeId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, spokeId_);
     }
     if (spoke_ != null) {
       output.writeMessage(3, getSpoke());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, requestId_);
     }
     unknownFields.writeTo(output);
@@ -405,16 +405,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getSpokeIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(spokeId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, spokeId_);
     }
     if (spoke_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getSpoke());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/DeleteHubRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/DeleteHubRequest.java
index dd8a3738..41903fa9 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/DeleteHubRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/DeleteHubRequest.java
@@ -257,10 +257,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, requestId_);
     }
     unknownFields.writeTo(output);
@@ -272,10 +272,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/DeleteSpokeRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/DeleteSpokeRequest.java
index cab73339..52d729d5 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/DeleteSpokeRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/DeleteSpokeRequest.java
@@ -257,10 +257,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, requestId_);
     }
     unknownFields.writeTo(output);
@@ -272,10 +272,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/GetHubRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/GetHubRequest.java
index f8ced56e..cb52b8c4 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/GetHubRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/GetHubRequest.java
@@ -178,7 +178,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -190,7 +190,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/GetSpokeRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/GetSpokeRequest.java
index fc7508d6..5c515924 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/GetSpokeRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/GetSpokeRequest.java
@@ -178,7 +178,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -190,7 +190,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/Hub.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/Hub.java
index 062d31a4..39540839 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/Hub.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/Hub.java
@@ -712,7 +712,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (createTime_ != null) {
@@ -723,10 +723,10 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     }
     com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
         output, internalGetLabels(), LabelsDefaultEntryHolder.defaultEntry, 4);
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, description_);
     }
-    if (!getUniqueIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uniqueId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 8, uniqueId_);
     }
     if (state_ != com.google.cloud.networkconnectivity.v1.State.STATE_UNSPECIFIED.getNumber()) {
@@ -744,7 +744,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (createTime_ != null) {
@@ -763,10 +763,10 @@ public int getSerializedSize() {
               .build();
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, labels__);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, description_);
     }
-    if (!getUniqueIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uniqueId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(8, uniqueId_);
     }
     if (state_ != com.google.cloud.networkconnectivity.v1.State.STATE_UNSPECIFIED.getNumber()) {
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListHubsRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListHubsRequest.java
index 537a662b..7fb7745c 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListHubsRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListHubsRequest.java
@@ -372,19 +372,19 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, filter_);
     }
-    if (!getOrderByBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(orderBy_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, orderBy_);
     }
     unknownFields.writeTo(output);
@@ -396,19 +396,19 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, filter_);
     }
-    if (!getOrderByBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(orderBy_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, orderBy_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListHubsResponse.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListHubsResponse.java
index df0fda9e..bc4ac4a5 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListHubsResponse.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListHubsResponse.java
@@ -339,7 +339,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < hubs_.size(); i++) {
       output.writeMessage(1, hubs_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     for (int i = 0; i < unreachable_.size(); i++) {
@@ -357,7 +357,7 @@ public int getSerializedSize() {
     for (int i = 0; i < hubs_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, hubs_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     {
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListSpokesRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListSpokesRequest.java
index be08707a..af0550af 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListSpokesRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListSpokesRequest.java
@@ -372,19 +372,19 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, filter_);
     }
-    if (!getOrderByBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(orderBy_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, orderBy_);
     }
     unknownFields.writeTo(output);
@@ -396,19 +396,19 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, filter_);
     }
-    if (!getOrderByBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(orderBy_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, orderBy_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListSpokesResponse.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListSpokesResponse.java
index eb898718..38cc1b0e 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListSpokesResponse.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/ListSpokesResponse.java
@@ -339,7 +339,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < spokes_.size(); i++) {
       output.writeMessage(1, spokes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     for (int i = 0; i < unreachable_.size(); i++) {
@@ -357,7 +357,7 @@ public int getSerializedSize() {
     for (int i = 0; i < spokes_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, spokes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     {
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/OperationMetadata.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/OperationMetadata.java
index 06a93211..f593ec11 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/OperationMetadata.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/OperationMetadata.java
@@ -505,19 +505,19 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (endTime_ != null) {
       output.writeMessage(2, getEndTime());
     }
-    if (!getTargetBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(target_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, target_);
     }
-    if (!getVerbBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(verb_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, verb_);
     }
-    if (!getStatusMessageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(statusMessage_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, statusMessage_);
     }
     if (requestedCancellation_ != false) {
       output.writeBool(6, requestedCancellation_);
     }
-    if (!getApiVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(apiVersion_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, apiVersion_);
     }
     unknownFields.writeTo(output);
@@ -535,19 +535,19 @@ public int getSerializedSize() {
     if (endTime_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getEndTime());
     }
-    if (!getTargetBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(target_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, target_);
     }
-    if (!getVerbBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(verb_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, verb_);
     }
-    if (!getStatusMessageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(statusMessage_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, statusMessage_);
     }
     if (requestedCancellation_ != false) {
       size += com.google.protobuf.CodedOutputStream.computeBoolSize(6, requestedCancellation_);
     }
-    if (!getApiVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(apiVersion_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, apiVersion_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/RouterApplianceInstance.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/RouterApplianceInstance.java
index ee7089eb..bd2b650c 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/RouterApplianceInstance.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/RouterApplianceInstance.java
@@ -234,10 +234,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getVirtualMachineBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(virtualMachine_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, virtualMachine_);
     }
-    if (!getIpAddressBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(ipAddress_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, ipAddress_);
     }
     unknownFields.writeTo(output);
@@ -249,10 +249,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getVirtualMachineBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(virtualMachine_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, virtualMachine_);
     }
-    if (!getIpAddressBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(ipAddress_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, ipAddress_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/RoutingVPC.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/RoutingVPC.java
index b16da707..ae4f2a53 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/RoutingVPC.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/RoutingVPC.java
@@ -175,7 +175,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uri_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, uri_);
     }
     unknownFields.writeTo(output);
@@ -187,7 +187,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getUriBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uri_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, uri_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/Spoke.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/Spoke.java
index 284a7694..b27c9777 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/Spoke.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/Spoke.java
@@ -889,7 +889,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (createTime_ != null) {
@@ -900,13 +900,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     }
     com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
         output, internalGetLabels(), LabelsDefaultEntryHolder.defaultEntry, 4);
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, description_);
     }
-    if (!getHubBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(hub_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, hub_);
     }
-    if (!getUniqueIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uniqueId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 11, uniqueId_);
     }
     if (state_ != com.google.cloud.networkconnectivity.v1.State.STATE_UNSPECIFIED.getNumber()) {
@@ -930,7 +930,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (createTime_ != null) {
@@ -949,13 +949,13 @@ public int getSerializedSize() {
               .build();
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, labels__);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, description_);
     }
-    if (!getHubBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(hub_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, hub_);
     }
-    if (!getUniqueIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uniqueId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(11, uniqueId_);
     }
     if (state_ != com.google.cloud.networkconnectivity.v1.State.STATE_UNSPECIFIED.getNumber()) {
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/UpdateHubRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/UpdateHubRequest.java
index f4846767..0cdc15d7 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/UpdateHubRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/UpdateHubRequest.java
@@ -346,7 +346,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (hub_ != null) {
       output.writeMessage(2, getHub());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, requestId_);
     }
     unknownFields.writeTo(output);
@@ -364,7 +364,7 @@ public int getSerializedSize() {
     if (hub_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getHub());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/UpdateSpokeRequest.java b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/UpdateSpokeRequest.java
index 81522d06..92bc0333 100644
--- a/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/UpdateSpokeRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1/src/main/java/com/google/cloud/networkconnectivity/v1/UpdateSpokeRequest.java
@@ -348,7 +348,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (spoke_ != null) {
       output.writeMessage(2, getSpoke());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, requestId_);
     }
     unknownFields.writeTo(output);
@@ -366,7 +366,7 @@ public int getSerializedSize() {
     if (spoke_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getSpoke());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/CreateHubRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/CreateHubRequest.java
index 72a21d38..4149dc9a 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/CreateHubRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/CreateHubRequest.java
@@ -383,16 +383,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getHubIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(hubId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, hubId_);
     }
     if (hub_ != null) {
       output.writeMessage(3, getHub());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, requestId_);
     }
     unknownFields.writeTo(output);
@@ -404,16 +404,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getHubIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(hubId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, hubId_);
     }
     if (hub_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getHub());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/CreateSpokeRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/CreateSpokeRequest.java
index 1ec6a5aa..fd1f63cb 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/CreateSpokeRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/CreateSpokeRequest.java
@@ -383,16 +383,16 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getSpokeIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(spokeId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, spokeId_);
     }
     if (spoke_ != null) {
       output.writeMessage(3, getSpoke());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, requestId_);
     }
     unknownFields.writeTo(output);
@@ -404,16 +404,16 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
-    if (!getSpokeIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(spokeId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, spokeId_);
     }
     if (spoke_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(3, getSpoke());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/DeleteHubRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/DeleteHubRequest.java
index 441829f5..99360a97 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/DeleteHubRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/DeleteHubRequest.java
@@ -255,10 +255,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, requestId_);
     }
     unknownFields.writeTo(output);
@@ -270,10 +270,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/DeleteSpokeRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/DeleteSpokeRequest.java
index 03c59d01..59e2dbf4 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/DeleteSpokeRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/DeleteSpokeRequest.java
@@ -255,10 +255,10 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, requestId_);
     }
     unknownFields.writeTo(output);
@@ -270,10 +270,10 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/GetHubRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/GetHubRequest.java
index 87bbdfd9..1ff83448 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/GetHubRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/GetHubRequest.java
@@ -178,7 +178,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -190,7 +190,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/GetSpokeRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/GetSpokeRequest.java
index df13a551..e306c274 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/GetSpokeRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/GetSpokeRequest.java
@@ -178,7 +178,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     unknownFields.writeTo(output);
@@ -190,7 +190,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/Hub.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/Hub.java
index cd11f02c..141cf1e6 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/Hub.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/Hub.java
@@ -673,7 +673,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (createTime_ != null) {
@@ -684,13 +684,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     }
     com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
         output, internalGetLabels(), LabelsDefaultEntryHolder.defaultEntry, 4);
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, description_);
     }
     for (int i = 0; i < spokes_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, spokes_.getRaw(i));
     }
-    if (!getUniqueIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uniqueId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 8, uniqueId_);
     }
     if (state_
@@ -706,7 +706,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (createTime_ != null) {
@@ -725,7 +725,7 @@ public int getSerializedSize() {
               .build();
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, labels__);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, description_);
     }
     {
@@ -736,7 +736,7 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getSpokesList().size();
     }
-    if (!getUniqueIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uniqueId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(8, uniqueId_);
     }
     if (state_
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListHubsRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListHubsRequest.java
index a51d1374..2d896f15 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListHubsRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListHubsRequest.java
@@ -372,19 +372,19 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, filter_);
     }
-    if (!getOrderByBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(orderBy_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, orderBy_);
     }
     unknownFields.writeTo(output);
@@ -396,19 +396,19 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, filter_);
     }
-    if (!getOrderByBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(orderBy_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, orderBy_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListHubsResponse.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListHubsResponse.java
index ca61da16..d05e7d07 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListHubsResponse.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListHubsResponse.java
@@ -341,7 +341,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < hubs_.size(); i++) {
       output.writeMessage(1, hubs_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     for (int i = 0; i < unreachable_.size(); i++) {
@@ -359,7 +359,7 @@ public int getSerializedSize() {
     for (int i = 0; i < hubs_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, hubs_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     {
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListSpokesRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListSpokesRequest.java
index bcffcc59..f675bca9 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListSpokesRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListSpokesRequest.java
@@ -372,19 +372,19 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (pageSize_ != 0) {
       output.writeInt32(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, filter_);
     }
-    if (!getOrderByBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(orderBy_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, orderBy_);
     }
     unknownFields.writeTo(output);
@@ -396,19 +396,19 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, parent_);
     }
     if (pageSize_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, pageSize_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
-    if (!getFilterBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(filter_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, filter_);
     }
-    if (!getOrderByBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(orderBy_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, orderBy_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListSpokesResponse.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListSpokesResponse.java
index 0484fda4..39a12555 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListSpokesResponse.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/ListSpokesResponse.java
@@ -342,7 +342,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < spokes_.size(); i++) {
       output.writeMessage(1, spokes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     for (int i = 0; i < unreachable_.size(); i++) {
@@ -360,7 +360,7 @@ public int getSerializedSize() {
     for (int i = 0; i < spokes_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, spokes_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     {
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/OperationMetadata.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/OperationMetadata.java
index 573f2898..eecb99e6 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/OperationMetadata.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/OperationMetadata.java
@@ -505,19 +505,19 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (endTime_ != null) {
       output.writeMessage(2, getEndTime());
     }
-    if (!getTargetBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(target_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, target_);
     }
-    if (!getVerbBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(verb_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, verb_);
     }
-    if (!getStatusMessageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(statusMessage_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, statusMessage_);
     }
     if (requestedCancellation_ != false) {
       output.writeBool(6, requestedCancellation_);
     }
-    if (!getApiVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(apiVersion_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, apiVersion_);
     }
     unknownFields.writeTo(output);
@@ -535,19 +535,19 @@ public int getSerializedSize() {
     if (endTime_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getEndTime());
     }
-    if (!getTargetBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(target_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, target_);
     }
-    if (!getVerbBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(verb_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, verb_);
     }
-    if (!getStatusMessageBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(statusMessage_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, statusMessage_);
     }
     if (requestedCancellation_ != false) {
       size += com.google.protobuf.CodedOutputStream.computeBoolSize(6, requestedCancellation_);
     }
-    if (!getApiVersionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(apiVersion_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, apiVersion_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/RouterApplianceInstance.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/RouterApplianceInstance.java
index 4fdd09df..558c25b9 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/RouterApplianceInstance.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/RouterApplianceInstance.java
@@ -279,13 +279,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getVirtualMachineBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(virtualMachine_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, virtualMachine_);
     }
-    if (!getNetworkInterfaceBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(networkInterface_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, networkInterface_);
     }
-    if (!getIpAddressBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(ipAddress_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, ipAddress_);
     }
     unknownFields.writeTo(output);
@@ -297,13 +297,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getVirtualMachineBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(virtualMachine_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, virtualMachine_);
     }
-    if (!getNetworkInterfaceBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(networkInterface_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, networkInterface_);
     }
-    if (!getIpAddressBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(ipAddress_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, ipAddress_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/Spoke.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/Spoke.java
index 38bc20a2..b52997b0 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/Spoke.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/Spoke.java
@@ -912,7 +912,7 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
     }
     if (createTime_ != null) {
@@ -923,13 +923,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     }
     com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
         output, internalGetLabels(), LabelsDefaultEntryHolder.defaultEntry, 4);
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, description_);
     }
-    if (!getHubBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(hub_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, hub_);
     }
-    if (!getUniqueIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uniqueId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 11, uniqueId_);
     }
     for (int i = 0; i < linkedVpnTunnels_.size(); i++) {
@@ -955,7 +955,7 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, name_);
     }
     if (createTime_ != null) {
@@ -974,13 +974,13 @@ public int getSerializedSize() {
               .build();
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, labels__);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, description_);
     }
-    if (!getHubBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(hub_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, hub_);
     }
-    if (!getUniqueIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(uniqueId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(11, uniqueId_);
     }
     {
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/UpdateHubRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/UpdateHubRequest.java
index 20f144b5..6467ad70 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/UpdateHubRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/UpdateHubRequest.java
@@ -347,7 +347,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (hub_ != null) {
       output.writeMessage(2, getHub());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, requestId_);
     }
     unknownFields.writeTo(output);
@@ -365,7 +365,7 @@ public int getSerializedSize() {
     if (hub_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getHub());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, requestId_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/UpdateSpokeRequest.java b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/UpdateSpokeRequest.java
index 351e47b6..03110439 100644
--- a/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/UpdateSpokeRequest.java
+++ b/proto-google-cloud-networkconnectivity-v1alpha1/src/main/java/com/google/cloud/networkconnectivity/v1alpha1/UpdateSpokeRequest.java
@@ -347,7 +347,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (spoke_ != null) {
       output.writeMessage(2, getSpoke());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, requestId_);
     }
     unknownFields.writeTo(output);
@@ -365,7 +365,7 @@ public int getSerializedSize() {
     if (spoke_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getSpoke());
     }
-    if (!getRequestIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, requestId_);
     }
     size += unknownFields.getSerializedSize();