diff --git a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/CloudFunctionsServiceClient.java b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/CloudFunctionsServiceClient.java
index 1c1e3a15..63ab3254 100644
--- a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/CloudFunctionsServiceClient.java
+++ b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/CloudFunctionsServiceClient.java
@@ -16,7 +16,6 @@
 
 package com.google.cloud.functions.v1;
 
-import com.google.api.core.ApiFunction;
 import com.google.api.core.ApiFuture;
 import com.google.api.core.ApiFutures;
 import com.google.api.core.BetaApi;
@@ -1191,12 +1190,7 @@ public static ApiFuture<ListFunctionsPagedResponse> createAsync(
           ListFunctionsPage.createEmptyPage().createPageAsync(context, futureResponse);
       return ApiFutures.transform(
           futurePage,
-          new ApiFunction<ListFunctionsPage, ListFunctionsPagedResponse>() {
-            @Override
-            public ListFunctionsPagedResponse apply(ListFunctionsPage input) {
-              return new ListFunctionsPagedResponse(input);
-            }
-          },
+          input -> new ListFunctionsPagedResponse(input),
           MoreExecutors.directExecutor());
     }
 
diff --git a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/CloudFunctionsServiceSettings.java b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/CloudFunctionsServiceSettings.java
index 27471aff..9b61b1ac 100644
--- a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/CloudFunctionsServiceSettings.java
+++ b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/CloudFunctionsServiceSettings.java
@@ -245,14 +245,13 @@ public CloudFunctionsServiceStubSettings.Builder getStubSettingsBuilder() {
       return ((CloudFunctionsServiceStubSettings.Builder) getStubSettings());
     }
 
-    // NEXT_MAJOR_VER: remove 'throws Exception'.
     /**
      * Applies the given settings updater function to all of the unary API methods in this service.
      *
      * <p>Note: This method does not support applying settings to streaming methods.
      */
     public Builder applyToAllUnaryMethods(
-        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
       super.applyToAllUnaryMethods(
           getStubSettingsBuilder().unaryMethodSettingsBuilders(), settingsUpdater);
       return this;
diff --git a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/CloudFunctionsServiceStubSettings.java b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/CloudFunctionsServiceStubSettings.java
index 06e21fd6..10f032d0 100644
--- a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/CloudFunctionsServiceStubSettings.java
+++ b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/CloudFunctionsServiceStubSettings.java
@@ -652,14 +652,13 @@ private static Builder initDefaults(Builder builder) {
       return builder;
     }
 
-    // NEXT_MAJOR_VER: remove 'throws Exception'.
     /**
      * Applies the given settings updater function to all of the unary API methods in this service.
      *
      * <p>Note: This method does not support applying settings to streaming methods.
      */
     public Builder applyToAllUnaryMethods(
-        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
       super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);
       return this;
     }
diff --git a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/GrpcCloudFunctionsServiceStub.java b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/GrpcCloudFunctionsServiceStub.java
index a68bcda7..eced98b4 100644
--- a/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/GrpcCloudFunctionsServiceStub.java
+++ b/google-cloud-functions/src/main/java/com/google/cloud/functions/v1/stub/GrpcCloudFunctionsServiceStub.java
@@ -24,7 +24,6 @@
 import com.google.api.gax.grpc.GrpcStubCallableFactory;
 import com.google.api.gax.rpc.ClientContext;
 import com.google.api.gax.rpc.OperationCallable;
-import com.google.api.gax.rpc.RequestParamsExtractor;
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.cloud.functions.v1.CallFunctionRequest;
 import com.google.cloud.functions.v1.CallFunctionResponse;
@@ -52,7 +51,6 @@
 import io.grpc.MethodDescriptor;
 import io.grpc.protobuf.ProtoUtils;
 import java.io.IOException;
-import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Generated;
 
@@ -247,78 +245,60 @@ protected GrpcCloudFunctionsServiceStub(
         GrpcCallSettings.<ListFunctionsRequest, ListFunctionsResponse>newBuilder()
             .setMethodDescriptor(listFunctionsMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<ListFunctionsRequest>() {
-                  @Override
-                  public Map<String, String> extract(ListFunctionsRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("parent", String.valueOf(request.getParent()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("parent", String.valueOf(request.getParent()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<GetFunctionRequest, CloudFunction> getFunctionTransportSettings =
         GrpcCallSettings.<GetFunctionRequest, CloudFunction>newBuilder()
             .setMethodDescriptor(getFunctionMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<GetFunctionRequest>() {
-                  @Override
-                  public Map<String, String> extract(GetFunctionRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("name", String.valueOf(request.getName()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("name", String.valueOf(request.getName()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<CreateFunctionRequest, Operation> createFunctionTransportSettings =
         GrpcCallSettings.<CreateFunctionRequest, Operation>newBuilder()
             .setMethodDescriptor(createFunctionMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<CreateFunctionRequest>() {
-                  @Override
-                  public Map<String, String> extract(CreateFunctionRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("location", String.valueOf(request.getLocation()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("location", String.valueOf(request.getLocation()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<UpdateFunctionRequest, Operation> updateFunctionTransportSettings =
         GrpcCallSettings.<UpdateFunctionRequest, Operation>newBuilder()
             .setMethodDescriptor(updateFunctionMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<UpdateFunctionRequest>() {
-                  @Override
-                  public Map<String, String> extract(UpdateFunctionRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("function.name", String.valueOf(request.getFunction().getName()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("function.name", String.valueOf(request.getFunction().getName()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<DeleteFunctionRequest, Operation> deleteFunctionTransportSettings =
         GrpcCallSettings.<DeleteFunctionRequest, Operation>newBuilder()
             .setMethodDescriptor(deleteFunctionMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<DeleteFunctionRequest>() {
-                  @Override
-                  public Map<String, String> extract(DeleteFunctionRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("name", String.valueOf(request.getName()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("name", String.valueOf(request.getName()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<CallFunctionRequest, CallFunctionResponse> callFunctionTransportSettings =
         GrpcCallSettings.<CallFunctionRequest, CallFunctionResponse>newBuilder()
             .setMethodDescriptor(callFunctionMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<CallFunctionRequest>() {
-                  @Override
-                  public Map<String, String> extract(CallFunctionRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("name", String.valueOf(request.getName()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("name", String.valueOf(request.getName()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<GenerateUploadUrlRequest, GenerateUploadUrlResponse>
@@ -326,13 +306,10 @@ public Map<String, String> extract(CallFunctionRequest request) {
             GrpcCallSettings.<GenerateUploadUrlRequest, GenerateUploadUrlResponse>newBuilder()
                 .setMethodDescriptor(generateUploadUrlMethodDescriptor)
                 .setParamsExtractor(
-                    new RequestParamsExtractor<GenerateUploadUrlRequest>() {
-                      @Override
-                      public Map<String, String> extract(GenerateUploadUrlRequest request) {
-                        ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                        params.put("parent", String.valueOf(request.getParent()));
-                        return params.build();
-                      }
+                    request -> {
+                      ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                      params.put("parent", String.valueOf(request.getParent()));
+                      return params.build();
                     })
                 .build();
     GrpcCallSettings<GenerateDownloadUrlRequest, GenerateDownloadUrlResponse>
@@ -340,39 +317,30 @@ public Map<String, String> extract(GenerateUploadUrlRequest request) {
             GrpcCallSettings.<GenerateDownloadUrlRequest, GenerateDownloadUrlResponse>newBuilder()
                 .setMethodDescriptor(generateDownloadUrlMethodDescriptor)
                 .setParamsExtractor(
-                    new RequestParamsExtractor<GenerateDownloadUrlRequest>() {
-                      @Override
-                      public Map<String, String> extract(GenerateDownloadUrlRequest request) {
-                        ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                        params.put("name", String.valueOf(request.getName()));
-                        return params.build();
-                      }
+                    request -> {
+                      ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                      params.put("name", String.valueOf(request.getName()));
+                      return params.build();
                     })
                 .build();
     GrpcCallSettings<SetIamPolicyRequest, Policy> setIamPolicyTransportSettings =
         GrpcCallSettings.<SetIamPolicyRequest, Policy>newBuilder()
             .setMethodDescriptor(setIamPolicyMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<SetIamPolicyRequest>() {
-                  @Override
-                  public Map<String, String> extract(SetIamPolicyRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("resource", String.valueOf(request.getResource()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("resource", String.valueOf(request.getResource()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<GetIamPolicyRequest, Policy> getIamPolicyTransportSettings =
         GrpcCallSettings.<GetIamPolicyRequest, Policy>newBuilder()
             .setMethodDescriptor(getIamPolicyMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<GetIamPolicyRequest>() {
-                  @Override
-                  public Map<String, String> extract(GetIamPolicyRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("resource", String.valueOf(request.getResource()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("resource", String.valueOf(request.getResource()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<TestIamPermissionsRequest, TestIamPermissionsResponse>
@@ -380,13 +348,10 @@ public Map<String, String> extract(GetIamPolicyRequest request) {
             GrpcCallSettings.<TestIamPermissionsRequest, TestIamPermissionsResponse>newBuilder()
                 .setMethodDescriptor(testIamPermissionsMethodDescriptor)
                 .setParamsExtractor(
-                    new RequestParamsExtractor<TestIamPermissionsRequest>() {
-                      @Override
-                      public Map<String, String> extract(TestIamPermissionsRequest request) {
-                        ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                        params.put("resource", String.valueOf(request.getResource()));
-                        return params.build();
-                      }
+                    request -> {
+                      ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                      params.put("resource", String.valueOf(request.getResource()));
+                      return params.build();
                     })
                 .build();