diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/CheckValidCredsRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/CheckValidCredsRequest.java
index a12ee6b4..e06d67c5 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/CheckValidCredsRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/CheckValidCredsRequest.java
@@ -187,7 +187,7 @@ 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);
@@ -199,7 +199,7 @@ 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-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/CreateTransferConfigRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/CreateTransferConfigRequest.java
index 499a9713..0e6ce2f2 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/CreateTransferConfigRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/CreateTransferConfigRequest.java
@@ -476,19 +476,19 @@ 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 (transferConfig_ != null) {
       output.writeMessage(2, getTransferConfig());
     }
-    if (!getAuthorizationCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(authorizationCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, authorizationCode_);
     }
-    if (!getVersionInfoBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(versionInfo_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, versionInfo_);
     }
-    if (!getServiceAccountNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(serviceAccountName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, serviceAccountName_);
     }
     unknownFields.writeTo(output);
@@ -500,19 +500,19 @@ 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 (transferConfig_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(2, getTransferConfig());
     }
-    if (!getAuthorizationCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(authorizationCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, authorizationCode_);
     }
-    if (!getVersionInfoBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(versionInfo_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, versionInfo_);
     }
-    if (!getServiceAccountNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(serviceAccountName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, serviceAccountName_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DataSource.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DataSource.java
index 2fdef513..2f4bf041 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DataSource.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DataSource.java
@@ -1404,19 +1404,19 @@ 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 (!getDataSourceIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(dataSourceId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, dataSourceId_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, description_);
     }
-    if (!getClientIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(clientId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, clientId_);
     }
     for (int i = 0; i < scopes_.size(); i++) {
@@ -1433,7 +1433,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (updateDeadlineSeconds_ != 0) {
       output.writeInt32(9, updateDeadlineSeconds_);
     }
-    if (!getDefaultScheduleBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(defaultSchedule_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 10, defaultSchedule_);
     }
     if (supportsCustomSchedule_ != false) {
@@ -1442,7 +1442,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < parameters_.size(); i++) {
       output.writeMessage(12, parameters_.get(i));
     }
-    if (!getHelpUrlBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(helpUrl_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 13, helpUrl_);
     }
     if (authorizationType_
@@ -1475,19 +1475,19 @@ 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 (!getDataSourceIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(dataSourceId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, dataSourceId_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, description_);
     }
-    if (!getClientIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(clientId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, clientId_);
     }
     {
@@ -1509,7 +1509,7 @@ public int getSerializedSize() {
     if (updateDeadlineSeconds_ != 0) {
       size += com.google.protobuf.CodedOutputStream.computeInt32Size(9, updateDeadlineSeconds_);
     }
-    if (!getDefaultScheduleBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(defaultSchedule_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(10, defaultSchedule_);
     }
     if (supportsCustomSchedule_ != false) {
@@ -1518,7 +1518,7 @@ public int getSerializedSize() {
     for (int i = 0; i < parameters_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(12, parameters_.get(i));
     }
-    if (!getHelpUrlBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(helpUrl_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(13, helpUrl_);
     }
     if (authorizationType_
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DataSourceParameter.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DataSourceParameter.java
index d843e356..428f4249 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DataSourceParameter.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DataSourceParameter.java
@@ -1165,13 +1165,13 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!getParamIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(paramId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, paramId_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
     }
     if (type_
@@ -1185,7 +1185,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (repeated_ != false) {
       output.writeBool(6, repeated_);
     }
-    if (!getValidationRegexBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(validationRegex_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, validationRegex_);
     }
     for (int i = 0; i < allowedValues_.size(); i++) {
@@ -1200,10 +1200,10 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < fields_.size(); i++) {
       output.writeMessage(11, fields_.get(i));
     }
-    if (!getValidationDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(validationDescription_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 12, validationDescription_);
     }
-    if (!getValidationHelpUrlBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(validationHelpUrl_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 13, validationHelpUrl_);
     }
     if (immutable_ != false) {
@@ -1224,13 +1224,13 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!getParamIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(paramId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, paramId_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, displayName_);
     }
-    if (!getDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, description_);
     }
     if (type_
@@ -1244,7 +1244,7 @@ public int getSerializedSize() {
     if (repeated_ != false) {
       size += com.google.protobuf.CodedOutputStream.computeBoolSize(6, repeated_);
     }
-    if (!getValidationRegexBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(validationRegex_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, validationRegex_);
     }
     {
@@ -1264,10 +1264,10 @@ public int getSerializedSize() {
     for (int i = 0; i < fields_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(11, fields_.get(i));
     }
-    if (!getValidationDescriptionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(validationDescription_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(12, validationDescription_);
     }
-    if (!getValidationHelpUrlBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(validationHelpUrl_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(13, validationHelpUrl_);
     }
     if (immutable_ != false) {
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DeleteTransferConfigRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DeleteTransferConfigRequest.java
index 204de87f..da3deb8b 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DeleteTransferConfigRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DeleteTransferConfigRequest.java
@@ -183,7 +183,7 @@ 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);
@@ -195,7 +195,7 @@ 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-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DeleteTransferRunRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DeleteTransferRunRequest.java
index e38e8800..abe3cd09 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DeleteTransferRunRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DeleteTransferRunRequest.java
@@ -182,7 +182,7 @@ 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);
@@ -194,7 +194,7 @@ 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-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetDataSourceRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetDataSourceRequest.java
index ebe5ce54..a81b9c83 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetDataSourceRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetDataSourceRequest.java
@@ -182,7 +182,7 @@ 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);
@@ -194,7 +194,7 @@ 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-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetTransferConfigRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetTransferConfigRequest.java
index f0021de6..3444c71a 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetTransferConfigRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetTransferConfigRequest.java
@@ -182,7 +182,7 @@ 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);
@@ -194,7 +194,7 @@ 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-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetTransferRunRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetTransferRunRequest.java
index 5e6be304..4b9780ab 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetTransferRunRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/GetTransferRunRequest.java
@@ -182,7 +182,7 @@ 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);
@@ -194,7 +194,7 @@ 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-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListDataSourcesRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListDataSourcesRequest.java
index ffc0eeea..aa3adda7 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListDataSourcesRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListDataSourcesRequest.java
@@ -270,10 +270,10 @@ 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 (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     if (pageSize_ != 0) {
@@ -288,10 +288,10 @@ 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 (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     if (pageSize_ != 0) {
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListDataSourcesResponse.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListDataSourcesResponse.java
index cfeb83dc..8dee6354 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListDataSourcesResponse.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListDataSourcesResponse.java
@@ -271,7 +271,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < dataSources_.size(); i++) {
       output.writeMessage(1, dataSources_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -286,7 +286,7 @@ public int getSerializedSize() {
     for (int i = 0; i < dataSources_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, dataSources_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferConfigsRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferConfigsRequest.java
index fe7c7c86..1d5ea674 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferConfigsRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferConfigsRequest.java
@@ -346,13 +346,13 @@ 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_);
     }
     for (int i = 0; i < dataSourceIds_.size(); i++) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, dataSourceIds_.getRaw(i));
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     if (pageSize_ != 0) {
@@ -367,7 +367,7 @@ 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_);
     }
     {
@@ -378,7 +378,7 @@ public int getSerializedSize() {
       size += dataSize;
       size += 1 * getDataSourceIdsList().size();
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     if (pageSize_ != 0) {
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferConfigsResponse.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferConfigsResponse.java
index 0d9945aa..aba97e7f 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferConfigsResponse.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferConfigsResponse.java
@@ -283,7 +283,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < transferConfigs_.size(); i++) {
       output.writeMessage(1, transferConfigs_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -298,7 +298,7 @@ public int getSerializedSize() {
     for (int i = 0; i < transferConfigs_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, transferConfigs_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferLogsRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferLogsRequest.java
index 4c641065..a1b7837b 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferLogsRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferLogsRequest.java
@@ -422,10 +422,10 @@ public final boolean isInitialized() {
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
     getSerializedSize();
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 4, pageToken_);
     }
     if (pageSize_ != 0) {
@@ -447,10 +447,10 @@ 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 (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, pageToken_);
     }
     if (pageSize_ != 0) {
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferLogsResponse.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferLogsResponse.java
index 45279660..a6f5e37f 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferLogsResponse.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferLogsResponse.java
@@ -285,7 +285,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < transferMessages_.size(); i++) {
       output.writeMessage(1, transferMessages_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -300,7 +300,7 @@ public int getSerializedSize() {
     for (int i = 0; i < transferMessages_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, transferMessages_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferRunsRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferRunsRequest.java
index ab69c109..fb4b0ca5 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferRunsRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferRunsRequest.java
@@ -593,7 +593,7 @@ public final boolean isInitialized() {
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
     getSerializedSize();
-    if (!getParentBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(parent_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 1, parent_);
     }
     if (getStatesList().size() > 0) {
@@ -603,7 +603,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < states_.size(); i++) {
       output.writeEnumNoTag(states_.get(i));
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, pageToken_);
     }
     if (pageSize_ != 0) {
@@ -624,7 +624,7 @@ 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_);
     }
     {
@@ -639,7 +639,7 @@ public int getSerializedSize() {
       }
       statesMemoizedSerializedSize = dataSize;
     }
-    if (!getPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(pageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, pageToken_);
     }
     if (pageSize_ != 0) {
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferRunsResponse.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferRunsResponse.java
index 96fbfd68..8712f8b6 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferRunsResponse.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ListTransferRunsResponse.java
@@ -283,7 +283,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     for (int i = 0; i < transferRuns_.size(); i++) {
       output.writeMessage(1, transferRuns_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nextPageToken_);
     }
     unknownFields.writeTo(output);
@@ -298,7 +298,7 @@ public int getSerializedSize() {
     for (int i = 0; i < transferRuns_.size(); i++) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, transferRuns_.get(i));
     }
-    if (!getNextPageTokenBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nextPageToken_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, nextPageToken_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ScheduleTransferRunsRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ScheduleTransferRunsRequest.java
index 5913bbac..f033da56 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ScheduleTransferRunsRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/ScheduleTransferRunsRequest.java
@@ -313,7 +313,7 @@ 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 (startTime_ != null) {
@@ -331,7 +331,7 @@ 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 (startTime_ != null) {
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/StartManualTransferRunsRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/StartManualTransferRunsRequest.java
index e63f6bc3..3af256a8 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/StartManualTransferRunsRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/StartManualTransferRunsRequest.java
@@ -1573,7 +1573,7 @@ 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 (timeCase_ == 3) {
@@ -1594,7 +1594,7 @@ 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 (timeCase_ == 3) {
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferConfig.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferConfig.java
index d4270cef..069f237a 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferConfig.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferConfig.java
@@ -1083,22 +1083,22 @@ 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 (destinationCase_ == 2) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 2, destination_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, displayName_);
     }
     if (updateTime_ != null) {
       output.writeMessage(4, getUpdateTime());
     }
-    if (!getDataSourceIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(dataSourceId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, dataSourceId_);
     }
-    if (!getScheduleBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(schedule_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, schedule_);
     }
     if (nextRunTime_ != null) {
@@ -1121,10 +1121,10 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (disabled_ != false) {
       output.writeBool(13, disabled_);
     }
-    if (!getDatasetRegionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(datasetRegion_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 14, datasetRegion_);
     }
-    if (!getNotificationPubsubTopicBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(notificationPubsubTopic_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 15, notificationPubsubTopic_);
     }
     if (emailPreferences_ != null) {
@@ -1142,22 +1142,22 @@ 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 (destinationCase_ == 2) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, destination_);
     }
-    if (!getDisplayNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(displayName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, displayName_);
     }
     if (updateTime_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, getUpdateTime());
     }
-    if (!getDataSourceIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(dataSourceId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, dataSourceId_);
     }
-    if (!getScheduleBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(schedule_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, schedule_);
     }
     if (nextRunTime_ != null) {
@@ -1180,10 +1180,10 @@ public int getSerializedSize() {
     if (disabled_ != false) {
       size += com.google.protobuf.CodedOutputStream.computeBoolSize(13, disabled_);
     }
-    if (!getDatasetRegionBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(datasetRegion_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(14, datasetRegion_);
     }
-    if (!getNotificationPubsubTopicBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(notificationPubsubTopic_)) {
       size +=
           com.google.protobuf.GeneratedMessageV3.computeStringSize(15, notificationPubsubTopic_);
     }
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferMessage.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferMessage.java
index 84f042d5..282dfb4c 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferMessage.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferMessage.java
@@ -476,7 +476,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
             .getNumber()) {
       output.writeEnum(2, severity_);
     }
-    if (!getMessageTextBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(messageText_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, messageText_);
     }
     unknownFields.writeTo(output);
@@ -497,7 +497,7 @@ public int getSerializedSize() {
             .getNumber()) {
       size += com.google.protobuf.CodedOutputStream.computeEnumSize(2, severity_);
     }
-    if (!getMessageTextBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(messageText_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, messageText_);
     }
     size += unknownFields.getSerializedSize();
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferRun.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferRun.java
index b453af86..00699c17 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferRun.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/TransferRun.java
@@ -1089,7 +1089,7 @@ 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 (destinationCase_ == 2) {
@@ -1107,7 +1107,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (updateTime_ != null) {
       output.writeMessage(6, getUpdateTime());
     }
-    if (!getDataSourceIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(dataSourceId_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 7, dataSourceId_);
     }
     if (state_
@@ -1124,13 +1124,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (userId_ != 0L) {
       output.writeInt64(11, userId_);
     }
-    if (!getScheduleBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(schedule_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 12, schedule_);
     }
     if (errorStatus_ != null) {
       output.writeMessage(21, getErrorStatus());
     }
-    if (!getNotificationPubsubTopicBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(notificationPubsubTopic_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 23, notificationPubsubTopic_);
     }
     if (emailPreferences_ != null) {
@@ -1145,7 +1145,7 @@ 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 (destinationCase_ == 2) {
@@ -1163,7 +1163,7 @@ public int getSerializedSize() {
     if (updateTime_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(6, getUpdateTime());
     }
-    if (!getDataSourceIdBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(dataSourceId_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(7, dataSourceId_);
     }
     if (state_
@@ -1180,13 +1180,13 @@ public int getSerializedSize() {
     if (userId_ != 0L) {
       size += com.google.protobuf.CodedOutputStream.computeInt64Size(11, userId_);
     }
-    if (!getScheduleBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(schedule_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(12, schedule_);
     }
     if (errorStatus_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(21, getErrorStatus());
     }
-    if (!getNotificationPubsubTopicBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(notificationPubsubTopic_)) {
       size +=
           com.google.protobuf.GeneratedMessageV3.computeStringSize(23, notificationPubsubTopic_);
     }
diff --git a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/UpdateTransferConfigRequest.java b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/UpdateTransferConfigRequest.java
index 12516a8f..1d34456d 100644
--- a/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/UpdateTransferConfigRequest.java
+++ b/proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/UpdateTransferConfigRequest.java
@@ -474,16 +474,16 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     if (transferConfig_ != null) {
       output.writeMessage(1, getTransferConfig());
     }
-    if (!getAuthorizationCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(authorizationCode_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 3, authorizationCode_);
     }
     if (updateMask_ != null) {
       output.writeMessage(4, getUpdateMask());
     }
-    if (!getVersionInfoBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(versionInfo_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 5, versionInfo_);
     }
-    if (!getServiceAccountNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(serviceAccountName_)) {
       com.google.protobuf.GeneratedMessageV3.writeString(output, 6, serviceAccountName_);
     }
     unknownFields.writeTo(output);
@@ -498,16 +498,16 @@ public int getSerializedSize() {
     if (transferConfig_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(1, getTransferConfig());
     }
-    if (!getAuthorizationCodeBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(authorizationCode_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, authorizationCode_);
     }
     if (updateMask_ != null) {
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(4, getUpdateMask());
     }
-    if (!getVersionInfoBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(versionInfo_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(5, versionInfo_);
     }
-    if (!getServiceAccountNameBytes().isEmpty()) {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(serviceAccountName_)) {
       size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, serviceAccountName_);
     }
     size += unknownFields.getSerializedSize();