diff --git a/gapic-generator-java/src/main/java/com/google/api/generator/engine/ast/TypeNode.java b/gapic-generator-java/src/main/java/com/google/api/generator/engine/ast/TypeNode.java
index b217feb057..12236842fc 100644
--- a/gapic-generator-java/src/main/java/com/google/api/generator/engine/ast/TypeNode.java
+++ b/gapic-generator-java/src/main/java/com/google/api/generator/engine/ast/TypeNode.java
@@ -74,6 +74,17 @@ public enum TypeKind {
       withReference(
           VaporReference.builder().setName("Value").setPakkage("com.google.protobuf").build());
 
+  public static final TypeNode UINT32VALUE =
+      withReference(
+          VaporReference.builder()
+              .setName("UInt32Value")
+              .setPakkage("com.google.protobuf")
+              .build());
+
+  public static final TypeNode INT32VALUE =
+      withReference(
+          VaporReference.builder().setName("Int32Value").setPakkage("com.google.protobuf").build());
+
   private static final Map<TypeNode, TypeNode> BOXED_TYPE_MAP = createBoxedTypeMap();
 
   public static final TypeNode VOID = builder().setTypeKind(TypeKind.VOID).build();
diff --git a/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java b/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java
index 6357ee3f3c..45c5d2193e 100644
--- a/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java
+++ b/gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java
@@ -149,6 +149,20 @@ public abstract class AbstractServiceStubSettingsClassComposer implements ClassC
 
   private final TransportContext transportContext;
 
+  // Maps of BigQuery methods to pagination types.
+  private static final ImmutableMap<String, TypeNode> BIGQUERY_PAGINATE_MAX_RESULT_TYPES =
+      ImmutableMap.of(
+          "com.google.cloud.bigquery.v2.ListDatasets",
+          TypeNode.UINT32VALUE,
+          "com.google.cloud.bigquery.v2.ListJobs",
+          TypeNode.INT32VALUE,
+          "com.google.cloud.bigquery.v2.ListModels",
+          TypeNode.UINT32VALUE,
+          "com.google.cloud.bigquery.v2.ListRoutines",
+          TypeNode.UINT32VALUE,
+          "com.google.cloud.bigquery.v2.ListTables",
+          TypeNode.UINT32VALUE);
+
   protected static final VariableExpr DEFAULT_SERVICE_SCOPES_VAR_EXPR =
       createDefaultServiceScopesVarExpr();
 
@@ -727,9 +741,12 @@ private static Expr createPagedListDescriptorAssignExpr(
             .build());
 
     // Create injectPageSize method.
+    String methodFullName =
+        String.format("%s.%s", method.inputType().reference().pakkage(), method.name());
     VariableExpr pageSizeVarExpr =
         VariableExpr.withVariable(
             Variable.builder().setType(TypeNode.INT).setName("pageSize").build());
+
     // Re-declare for clarity and easier readability.
     returnType = method.inputType();
     returnExpr =
@@ -738,6 +755,20 @@ private static Expr createPagedListDescriptorAssignExpr(
             .setMethodName("set" + JavaStyle.toUpperCamelCase(method.pageSizeFieldName()))
             .setArguments(pageSizeVarExpr)
             .build();
+    if (BIGQUERY_PAGINATE_MAX_RESULT_TYPES.containsKey(methodFullName)) {
+      returnExpr =
+          MethodInvocationExpr.builder()
+              .setExprReferenceExpr(newBuilderExpr)
+              .setMethodName("set" + JavaStyle.toUpperCamelCase(method.pageSizeFieldName()))
+              .setArguments(
+                  MethodInvocationExpr.builder()
+                      .setStaticReferenceType(
+                          BIGQUERY_PAGINATE_MAX_RESULT_TYPES.get(methodFullName))
+                      .setMethodName("of")
+                      .setArguments(pageSizeVarExpr)
+                      .build())
+              .build();
+    }
     returnExpr =
         MethodInvocationExpr.builder()
             .setExprReferenceExpr(returnExpr)
@@ -758,17 +789,32 @@ private static Expr createPagedListDescriptorAssignExpr(
     // TODO(miraleung): Test the edge cases where these proto fields aren't present.
     // Create extractPageSize method.
     returnType = TypeNode.INT_OBJECT;
+    returnExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(payloadVarExpr)
+            .setMethodName("get" + JavaStyle.toUpperCamelCase(method.pageSizeFieldName()))
+            .setReturnType(returnType)
+            .build();
+    if (BIGQUERY_PAGINATE_MAX_RESULT_TYPES.containsKey(methodFullName)) {
+      // Return type is UINT32VALUE or INT32VALUE so use getValue to unwrap.
+      returnExpr =
+          MethodInvocationExpr.builder()
+              .setExprReferenceExpr(payloadVarExpr)
+              .setMethodName("get" + JavaStyle.toUpperCamelCase(method.pageSizeFieldName()))
+              .build();
+      returnExpr =
+          MethodInvocationExpr.builder()
+              .setExprReferenceExpr(returnExpr)
+              .setMethodName("getValue")
+              .setReturnType(returnType)
+              .build();
+    }
     anonClassMethods.add(
         methodStarterBuilder
             .setReturnType(returnType)
             .setName("extractPageSize")
             .setArguments(payloadVarExpr.toBuilder().setIsDecl(true).build())
-            .setReturnExpr(
-                MethodInvocationExpr.builder()
-                    .setExprReferenceExpr(payloadVarExpr)
-                    .setMethodName("get" + JavaStyle.toUpperCamelCase(method.pageSizeFieldName()))
-                    .setReturnType(returnType)
-                    .build())
+            .setReturnExpr(returnExpr)
             .build());
 
     // Create extractNextToken method.
diff --git a/gapic-generator-java/src/main/java/com/google/api/generator/gapic/protoparser/Parser.java b/gapic-generator-java/src/main/java/com/google/api/generator/gapic/protoparser/Parser.java
index 975ccf58fa..0ff6a71039 100644
--- a/gapic-generator-java/src/main/java/com/google/api/generator/gapic/protoparser/Parser.java
+++ b/gapic-generator-java/src/main/java/com/google/api/generator/gapic/protoparser/Parser.java
@@ -121,6 +121,16 @@ enum SelectiveGapicType {
   private static final Set<String> MIXIN_JAVA_PACKAGE_ALLOWLIST =
       ImmutableSet.of("com.google.iam.v1", "com.google.longrunning", "com.google.cloud.location");
 
+  // List of BigQuery methods that can use max_result field as an alternative to page_size for
+  // pagination.
+  private static final ImmutableSet<String> BIGQUERY_LEGACY_PAGINATION_ALLOWLIST =
+      ImmutableSet.of(
+          "google.cloud.bigquery.v2.JobService.ListJobs",
+          "google.cloud.bigquery.v2.RoutineService.ListRoutines",
+          "google.cloud.bigquery.v2.DatasetService.ListDatasets",
+          "google.cloud.bigquery.v2.ModelService.ListModels",
+          "google.cloud.bigquery.v2.TableService.ListTables");
+
   // Allow other parsers to access this.
   protected static final SourceCodeInfoParser SOURCE_CODE_INFO_PARSER = new SourceCodeInfoParser();
 
@@ -1029,7 +1039,8 @@ static String parsePageSizeFieldName(
       // page_size gets priority over max_results if both are present
       List<String> fieldNames = new ArrayList<>();
       fieldNames.add("page_size");
-      if (transport == Transport.REST) {
+      if ((transport == Transport.REST)
+          || (BIGQUERY_LEGACY_PAGINATION_ALLOWLIST.contains(methodDescriptor.getFullName()))) {
         fieldNames.add("max_results");
       }
       for (String fieldName : fieldNames) {
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/ClientLibraryReflectConfigComposerTest.java b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/ClientLibraryReflectConfigComposerTest.java
index 715c7d5f7f..31d3f7a578 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/ClientLibraryReflectConfigComposerTest.java
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/ClientLibraryReflectConfigComposerTest.java
@@ -61,6 +61,8 @@ void composeReflectConfigs_showcase() {
             "com.google.showcase.v1beta1.Foobar$Builder",
             "com.google.showcase.v1beta1.Object",
             "com.google.showcase.v1beta1.Object$Builder",
+            "com.google.showcase.v1beta1.PagedExpandLegacyRequest",
+            "com.google.showcase.v1beta1.PagedExpandLegacyRequest$Builder",
             "com.google.showcase.v1beta1.PagedExpandRequest",
             "com.google.showcase.v1beta1.PagedExpandRequest$Builder",
             "com.google.showcase.v1beta1.PagedExpandResponse",
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceStubClassComposerTest.java b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceStubClassComposerTest.java
index 5c910cd618..bde0a9c2d5 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceStubClassComposerTest.java
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/GrpcServiceStubClassComposerTest.java
@@ -101,4 +101,15 @@ void generateGrpcServiceStubClass_callableNameType() {
     Assert.assertGoldenClass(this.getClass(), clazz, "GrpcCallableNameTypeStub.golden");
     Assert.assertEmptySamples(clazz.samples());
   }
+
+  @Test
+  void generateGrpcServiceStubClass_bigQuery() {
+    GapicContext context = GrpcTestProtoLoader.instance().parseBigqueryService();
+
+    Service bigqueryJobService = context.services().get(0);
+    GapicClass clazz =
+        GrpcServiceStubClassComposer.instance().generate(context, bigqueryJobService);
+    Assert.assertGoldenClass(this.getClass(), clazz, "GrpcBigQueryJobServiceStub.golden");
+    Assert.assertEmptySamples(clazz.samples());
+  }
 }
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubSettingsClassComposerTest.java b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubSettingsClassComposerTest.java
index fb6c34d451..3287309ee4 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubSettingsClassComposerTest.java
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/ServiceStubSettingsClassComposerTest.java
@@ -62,7 +62,13 @@ static Stream<Arguments> data() {
             GrpcTestProtoLoader.instance().parseSelectiveGenerationTesting(),
             "localhost:7469",
             "v1beta1",
-            1));
+            1),
+        Arguments.of(
+            "JobServiceStubSettings",
+            GrpcTestProtoLoader.instance().parseBigqueryService(),
+            "bigquery",
+            "v2",
+            0));
   }
 
   @ParameterizedTest
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClient.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClient.golden
index 431700191c..612111aea0 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClient.golden
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClient.golden
@@ -206,6 +206,20 @@ import javax.annotation.Generated;
  *      </ul>
  *       </td>
  *    </tr>
+ *    <tr>
+ *      <td><p> PagedExpandLegacy</td>
+ *      <td><p> </td>
+ *      <td>
+ *      <p>Request object method variants only take one parameter, a request object, which must be constructed before the call.</p>
+ *      <ul>
+ *           <li><p> pagedExpandLegacy(PagedExpandLegacyRequest request)
+ *      </ul>
+ *      <p>Callable method variants take no parameters and return an immutable API callable object, which can be used to initiate calls to the service.</p>
+ *      <ul>
+ *           <li><p> pagedExpandLegacyCallable()
+ *      </ul>
+ *       </td>
+ *    </tr>
  *  </table>
  *
  * <p>See the individual methods for example code.
@@ -1124,6 +1138,63 @@ public class EchoClient implements BackgroundResource {
     return stub.collideNameCallable();
   }
 
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Sample code:
+   *
+   * <pre>{@code
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
+   * try (EchoClient echoClient = EchoClient.create()) {
+   *   PagedExpandLegacyRequest request =
+   *       PagedExpandLegacyRequest.newBuilder()
+   *           .setContent("content951530617")
+   *           .setMaxResults(1128457243)
+   *           .setPageToken("pageToken873572522")
+   *           .build();
+   *   PagedExpandResponse response = echoClient.pagedExpandLegacy(request);
+   * }
+   * }</pre>
+   *
+   * @param request The request object containing all of the parameters for the API call.
+   * @throws com.google.api.gax.rpc.ApiException if the remote call fails
+   */
+  public final PagedExpandResponse pagedExpandLegacy(PagedExpandLegacyRequest request) {
+    return pagedExpandLegacyCallable().call(request);
+  }
+
+  // AUTO-GENERATED DOCUMENTATION AND METHOD.
+  /**
+   * Sample code:
+   *
+   * <pre>{@code
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
+   * try (EchoClient echoClient = EchoClient.create()) {
+   *   PagedExpandLegacyRequest request =
+   *       PagedExpandLegacyRequest.newBuilder()
+   *           .setContent("content951530617")
+   *           .setMaxResults(1128457243)
+   *           .setPageToken("pageToken873572522")
+   *           .build();
+   *   ApiFuture<PagedExpandResponse> future =
+   *       echoClient.pagedExpandLegacyCallable().futureCall(request);
+   *   // Do something.
+   *   PagedExpandResponse response = future.get();
+   * }
+   * }</pre>
+   */
+  public final UnaryCallable<PagedExpandLegacyRequest, PagedExpandResponse>
+      pagedExpandLegacyCallable() {
+    return stub.pagedExpandLegacyCallable();
+  }
+
   @Override
   public final void close() {
     stub.close();
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClientTest.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClientTest.golden
index 1372cdd94e..515649a093 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClientTest.golden
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoClientTest.golden
@@ -26,6 +26,7 @@ import com.google.protobuf.Timestamp;
 import com.google.rpc.Status;
 import io.grpc.StatusRuntimeException;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.UUID;
@@ -890,4 +891,55 @@ public class EchoClientTest {
       // Expected exception.
     }
   }
+
+  @Test
+  public void pagedExpandLegacyTest() throws Exception {
+    PagedExpandResponse expectedResponse =
+        PagedExpandResponse.newBuilder()
+            .addAllResponses(new ArrayList<EchoResponse>())
+            .setNextPageToken("nextPageToken-1386094857")
+            .build();
+    mockEcho.addResponse(expectedResponse);
+
+    PagedExpandLegacyRequest request =
+        PagedExpandLegacyRequest.newBuilder()
+            .setContent("content951530617")
+            .setMaxResults(1128457243)
+            .setPageToken("pageToken873572522")
+            .build();
+
+    PagedExpandResponse actualResponse = client.pagedExpandLegacy(request);
+    Assert.assertEquals(expectedResponse, actualResponse);
+
+    List<AbstractMessage> actualRequests = mockEcho.getRequests();
+    Assert.assertEquals(1, actualRequests.size());
+    PagedExpandLegacyRequest actualRequest = ((PagedExpandLegacyRequest) actualRequests.get(0));
+
+    Assert.assertEquals(request.getContent(), actualRequest.getContent());
+    Assert.assertEquals(request.getMaxResults(), actualRequest.getMaxResults());
+    Assert.assertEquals(request.getPageToken(), actualRequest.getPageToken());
+    Assert.assertTrue(
+        channelProvider.isHeaderSent(
+            ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
+            GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
+  }
+
+  @Test
+  public void pagedExpandLegacyExceptionTest() throws Exception {
+    StatusRuntimeException exception = new StatusRuntimeException(io.grpc.Status.INVALID_ARGUMENT);
+    mockEcho.addException(exception);
+
+    try {
+      PagedExpandLegacyRequest request =
+          PagedExpandLegacyRequest.newBuilder()
+              .setContent("content951530617")
+              .setMaxResults(1128457243)
+              .setPageToken("pageToken873572522")
+              .build();
+      client.pagedExpandLegacy(request);
+      Assert.fail("No exception raised");
+    } catch (InvalidArgumentException e) {
+      // Expected exception.
+    }
+  }
 }
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoSettings.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoSettings.golden
index e3cfa3f0f2..deb3a387bf 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoSettings.golden
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoSettings.golden
@@ -159,6 +159,12 @@ public class EchoSettings extends ClientSettings<EchoSettings> {
     return ((EchoStubSettings) getStubSettings()).collideNameSettings();
   }
 
+  /** Returns the object with the settings used for calls to pagedExpandLegacy. */
+  public UnaryCallSettings<PagedExpandLegacyRequest, PagedExpandResponse>
+      pagedExpandLegacySettings() {
+    return ((EchoStubSettings) getStubSettings()).pagedExpandLegacySettings();
+  }
+
   public static final EchoSettings create(EchoStubSettings stub) throws IOException {
     return new EchoSettings.Builder(stub.toBuilder()).build();
   }
@@ -314,6 +320,12 @@ public class EchoSettings extends ClientSettings<EchoSettings> {
       return getStubSettingsBuilder().collideNameSettings();
     }
 
+    /** Returns the builder for the settings used for calls to pagedExpandLegacy. */
+    public UnaryCallSettings.Builder<PagedExpandLegacyRequest, PagedExpandResponse>
+        pagedExpandLegacySettings() {
+      return getStubSettingsBuilder().pagedExpandLegacySettings();
+    }
+
     @Override
     public EchoSettings build() throws IOException {
       return new EchoSettings(this);
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStub.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStub.golden
index 9270f22851..c43465da68 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStub.golden
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStub.golden
@@ -18,6 +18,7 @@ import com.google.showcase.v1beta1.EchoRequest;
 import com.google.showcase.v1beta1.EchoResponse;
 import com.google.showcase.v1beta1.ExpandRequest;
 import com.google.showcase.v1beta1.Object;
+import com.google.showcase.v1beta1.PagedExpandLegacyRequest;
 import com.google.showcase.v1beta1.PagedExpandRequest;
 import com.google.showcase.v1beta1.PagedExpandResponse;
 import com.google.showcase.v1beta1.WaitMetadata;
@@ -92,6 +93,10 @@ public abstract class EchoStub implements BackgroundResource {
     throw new UnsupportedOperationException("Not implemented: collideNameCallable()");
   }
 
+  public UnaryCallable<PagedExpandLegacyRequest, PagedExpandResponse> pagedExpandLegacyCallable() {
+    throw new UnsupportedOperationException("Not implemented: pagedExpandLegacyCallable()");
+  }
+
   @Override
   public abstract void close();
 }
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStubSettings.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStubSettings.golden
index e43bb64604..77d8fbf45a 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStubSettings.golden
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/EchoStubSettings.golden
@@ -43,6 +43,7 @@ import com.google.showcase.v1beta1.EchoRequest;
 import com.google.showcase.v1beta1.EchoResponse;
 import com.google.showcase.v1beta1.ExpandRequest;
 import com.google.showcase.v1beta1.Object;
+import com.google.showcase.v1beta1.PagedExpandLegacyRequest;
 import com.google.showcase.v1beta1.PagedExpandRequest;
 import com.google.showcase.v1beta1.PagedExpandResponse;
 import com.google.showcase.v1beta1.WaitMetadata;
@@ -149,6 +150,8 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
       waitOperationSettings;
   private final UnaryCallSettings<BlockRequest, BlockResponse> blockSettings;
   private final UnaryCallSettings<EchoRequest, Object> collideNameSettings;
+  private final UnaryCallSettings<PagedExpandLegacyRequest, PagedExpandResponse>
+      pagedExpandLegacySettings;
 
   private static final PagedListDescriptor<PagedExpandRequest, PagedExpandResponse, EchoResponse>
       PAGED_EXPAND_PAGE_STR_DESC =
@@ -309,6 +312,12 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
     return collideNameSettings;
   }
 
+  /** Returns the object with the settings used for calls to pagedExpandLegacy. */
+  public UnaryCallSettings<PagedExpandLegacyRequest, PagedExpandResponse>
+      pagedExpandLegacySettings() {
+    return pagedExpandLegacySettings;
+  }
+
   public EchoStub createStub() throws IOException {
     if (getTransportChannelProvider()
         .getTransportName()
@@ -394,6 +403,7 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
     waitOperationSettings = settingsBuilder.waitOperationSettings().build();
     blockSettings = settingsBuilder.blockSettings().build();
     collideNameSettings = settingsBuilder.collideNameSettings().build();
+    pagedExpandLegacySettings = settingsBuilder.pagedExpandLegacySettings().build();
   }
 
   /** Builder for EchoStubSettings. */
@@ -415,6 +425,8 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
         waitOperationSettings;
     private final UnaryCallSettings.Builder<BlockRequest, BlockResponse> blockSettings;
     private final UnaryCallSettings.Builder<EchoRequest, Object> collideNameSettings;
+    private final UnaryCallSettings.Builder<PagedExpandLegacyRequest, PagedExpandResponse>
+        pagedExpandLegacySettings;
     private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>
         RETRYABLE_CODE_DEFINITIONS;
 
@@ -476,6 +488,7 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
       waitOperationSettings = OperationCallSettings.newBuilder();
       blockSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
       collideNameSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      pagedExpandLegacySettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
 
       unaryMethodSettingsBuilders =
           ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
@@ -484,7 +497,8 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
               simplePagedExpandSettings,
               waitSettings,
               blockSettings,
-              collideNameSettings);
+              collideNameSettings,
+              pagedExpandLegacySettings);
       initDefaults(this);
     }
 
@@ -502,6 +516,7 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
       waitOperationSettings = settings.waitOperationSettings.toBuilder();
       blockSettings = settings.blockSettings.toBuilder();
       collideNameSettings = settings.collideNameSettings.toBuilder();
+      pagedExpandLegacySettings = settings.pagedExpandLegacySettings.toBuilder();
 
       unaryMethodSettingsBuilders =
           ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(
@@ -510,7 +525,8 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
               simplePagedExpandSettings,
               waitSettings,
               blockSettings,
-              collideNameSettings);
+              collideNameSettings,
+              pagedExpandLegacySettings);
     }
 
     private static Builder createDefault() {
@@ -561,6 +577,11 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
           .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("no_retry_0_codes"))
           .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("no_retry_0_params"));
 
+      builder
+          .pagedExpandLegacySettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("no_retry_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("no_retry_0_params"));
+
       builder
           .waitOperationSettings()
           .setInitialCallSettings(
@@ -662,6 +683,12 @@ public class EchoStubSettings extends StubSettings<EchoStubSettings> {
       return collideNameSettings;
     }
 
+    /** Returns the builder for the settings used for calls to pagedExpandLegacy. */
+    public UnaryCallSettings.Builder<PagedExpandLegacyRequest, PagedExpandResponse>
+        pagedExpandLegacySettings() {
+      return pagedExpandLegacySettings;
+    }
+
     @Override
     public EchoStubSettings build() throws IOException {
       return new EchoStubSettings(this);
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/GrpcBigQueryJobServiceStub.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/GrpcBigQueryJobServiceStub.golden
new file mode 100644
index 0000000000..c1c51ff44b
--- /dev/null
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/GrpcBigQueryJobServiceStub.golden
@@ -0,0 +1,187 @@
+package com.google.cloud.bigquery.v2.stub;
+
+import static com.google.cloud.bigquery.v2.JobServiceClient.ListJobsPagedResponse;
+
+import com.google.api.gax.core.BackgroundResource;
+import com.google.api.gax.core.BackgroundResourceAggregation;
+import com.google.api.gax.grpc.GrpcCallSettings;
+import com.google.api.gax.grpc.GrpcStubCallableFactory;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.RequestParamsBuilder;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.bigquery.v2.JobProto;
+import com.google.longrunning.stub.GrpcOperationsStub;
+import com.google.protobuf.Empty;
+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;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * gRPC stub implementation for the JobService service API.
+ *
+ * <p>This class is for advanced usage and reflects the underlying API directly.
+ */
+@Generated("by gapic-generator-java")
+public class GrpcJobServiceStub extends JobServiceStub {
+  private static final MethodDescriptor<JobProto.DeleteJobRequest, Empty>
+      deleteJobMethodDescriptor =
+          MethodDescriptor.<JobProto.DeleteJobRequest, Empty>newBuilder()
+              .setType(MethodDescriptor.MethodType.UNARY)
+              .setFullMethodName("google.cloud.bigquery.v2.JobService/DeleteJob")
+              .setRequestMarshaller(
+                  ProtoUtils.marshaller(JobProto.DeleteJobRequest.getDefaultInstance()))
+              .setResponseMarshaller(ProtoUtils.marshaller(Empty.getDefaultInstance()))
+              .build();
+
+  private static final MethodDescriptor<JobProto.ListJobsRequest, JobProto.JobList>
+      listJobsMethodDescriptor =
+          MethodDescriptor.<JobProto.ListJobsRequest, JobProto.JobList>newBuilder()
+              .setType(MethodDescriptor.MethodType.UNARY)
+              .setFullMethodName("google.cloud.bigquery.v2.JobService/ListJobs")
+              .setRequestMarshaller(
+                  ProtoUtils.marshaller(JobProto.ListJobsRequest.getDefaultInstance()))
+              .setResponseMarshaller(ProtoUtils.marshaller(JobProto.JobList.getDefaultInstance()))
+              .build();
+
+  private final UnaryCallable<JobProto.DeleteJobRequest, Empty> deleteJobCallable;
+  private final UnaryCallable<JobProto.ListJobsRequest, JobProto.JobList> listJobsCallable;
+  private final UnaryCallable<JobProto.ListJobsRequest, ListJobsPagedResponse>
+      listJobsPagedCallable;
+
+  private final BackgroundResource backgroundResources;
+  private final GrpcOperationsStub operationsStub;
+  private final GrpcStubCallableFactory callableFactory;
+
+  public static final GrpcJobServiceStub create(JobServiceStubSettings settings)
+      throws IOException {
+    return new GrpcJobServiceStub(settings, ClientContext.create(settings));
+  }
+
+  public static final GrpcJobServiceStub create(ClientContext clientContext) throws IOException {
+    return new GrpcJobServiceStub(JobServiceStubSettings.newBuilder().build(), clientContext);
+  }
+
+  public static final GrpcJobServiceStub create(
+      ClientContext clientContext, GrpcStubCallableFactory callableFactory) throws IOException {
+    return new GrpcJobServiceStub(
+        JobServiceStubSettings.newBuilder().build(), clientContext, callableFactory);
+  }
+
+  /**
+   * Constructs an instance of GrpcJobServiceStub, using the given settings. This is protected so
+   * that it is easy to make a subclass, but otherwise, the static factory methods should be
+   * preferred.
+   */
+  protected GrpcJobServiceStub(JobServiceStubSettings settings, ClientContext clientContext)
+      throws IOException {
+    this(settings, clientContext, new GrpcJobServiceCallableFactory());
+  }
+
+  /**
+   * Constructs an instance of GrpcJobServiceStub, using the given settings. This is protected so
+   * that it is easy to make a subclass, but otherwise, the static factory methods should be
+   * preferred.
+   */
+  protected GrpcJobServiceStub(
+      JobServiceStubSettings settings,
+      ClientContext clientContext,
+      GrpcStubCallableFactory callableFactory)
+      throws IOException {
+    this.callableFactory = callableFactory;
+    this.operationsStub = GrpcOperationsStub.create(clientContext, callableFactory);
+
+    GrpcCallSettings<JobProto.DeleteJobRequest, Empty> deleteJobTransportSettings =
+        GrpcCallSettings.<JobProto.DeleteJobRequest, Empty>newBuilder()
+            .setMethodDescriptor(deleteJobMethodDescriptor)
+            .setParamsExtractor(
+                request -> {
+                  RequestParamsBuilder builder = RequestParamsBuilder.create();
+                  builder.add("job_id", String.valueOf(request.getJobId()));
+                  builder.add("project_id", String.valueOf(request.getProjectId()));
+                  return builder.build();
+                })
+            .build();
+    GrpcCallSettings<JobProto.ListJobsRequest, JobProto.JobList> listJobsTransportSettings =
+        GrpcCallSettings.<JobProto.ListJobsRequest, JobProto.JobList>newBuilder()
+            .setMethodDescriptor(listJobsMethodDescriptor)
+            .setParamsExtractor(
+                request -> {
+                  RequestParamsBuilder builder = RequestParamsBuilder.create();
+                  builder.add("project_id", String.valueOf(request.getProjectId()));
+                  return builder.build();
+                })
+            .build();
+
+    this.deleteJobCallable =
+        callableFactory.createUnaryCallable(
+            deleteJobTransportSettings, settings.deleteJobSettings(), clientContext);
+    this.listJobsCallable =
+        callableFactory.createUnaryCallable(
+            listJobsTransportSettings, settings.listJobsSettings(), clientContext);
+    this.listJobsPagedCallable =
+        callableFactory.createPagedCallable(
+            listJobsTransportSettings, settings.listJobsSettings(), clientContext);
+
+    this.backgroundResources =
+        new BackgroundResourceAggregation(clientContext.getBackgroundResources());
+  }
+
+  public GrpcOperationsStub getOperationsStub() {
+    return operationsStub;
+  }
+
+  @Override
+  public UnaryCallable<JobProto.DeleteJobRequest, Empty> deleteJobCallable() {
+    return deleteJobCallable;
+  }
+
+  @Override
+  public UnaryCallable<JobProto.ListJobsRequest, JobProto.JobList> listJobsCallable() {
+    return listJobsCallable;
+  }
+
+  @Override
+  public UnaryCallable<JobProto.ListJobsRequest, ListJobsPagedResponse> listJobsPagedCallable() {
+    return listJobsPagedCallable;
+  }
+
+  @Override
+  public final void close() {
+    try {
+      backgroundResources.close();
+    } catch (RuntimeException e) {
+      throw e;
+    } catch (Exception e) {
+      throw new IllegalStateException("Failed to close resource", e);
+    }
+  }
+
+  @Override
+  public void shutdown() {
+    backgroundResources.shutdown();
+  }
+
+  @Override
+  public boolean isShutdown() {
+    return backgroundResources.isShutdown();
+  }
+
+  @Override
+  public boolean isTerminated() {
+    return backgroundResources.isTerminated();
+  }
+
+  @Override
+  public void shutdownNow() {
+    backgroundResources.shutdownNow();
+  }
+
+  @Override
+  public boolean awaitTermination(long duration, TimeUnit unit) throws InterruptedException {
+    return backgroundResources.awaitTermination(duration, unit);
+  }
+}
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/GrpcEchoStub.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/GrpcEchoStub.golden
index 940ab7d4c4..7972dc929b 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/GrpcEchoStub.golden
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/GrpcEchoStub.golden
@@ -22,6 +22,7 @@ import com.google.showcase.v1beta1.EchoRequest;
 import com.google.showcase.v1beta1.EchoResponse;
 import com.google.showcase.v1beta1.ExpandRequest;
 import com.google.showcase.v1beta1.Object;
+import com.google.showcase.v1beta1.PagedExpandLegacyRequest;
 import com.google.showcase.v1beta1.PagedExpandRequest;
 import com.google.showcase.v1beta1.PagedExpandResponse;
 import com.google.showcase.v1beta1.WaitMetadata;
@@ -126,6 +127,17 @@ public class GrpcEchoStub extends EchoStub {
           .setResponseMarshaller(ProtoUtils.marshaller(Object.getDefaultInstance()))
           .build();
 
+  private static final MethodDescriptor<PagedExpandLegacyRequest, PagedExpandResponse>
+      pagedExpandLegacyMethodDescriptor =
+          MethodDescriptor.<PagedExpandLegacyRequest, PagedExpandResponse>newBuilder()
+              .setType(MethodDescriptor.MethodType.UNARY)
+              .setFullMethodName("google.showcase.v1beta1.Echo/PagedExpandLegacy")
+              .setRequestMarshaller(
+                  ProtoUtils.marshaller(PagedExpandLegacyRequest.getDefaultInstance()))
+              .setResponseMarshaller(
+                  ProtoUtils.marshaller(PagedExpandResponse.getDefaultInstance()))
+              .build();
+
   private final UnaryCallable<EchoRequest, EchoResponse> echoCallable;
   private final ServerStreamingCallable<ExpandRequest, EchoResponse> expandCallable;
   private final ClientStreamingCallable<EchoRequest, EchoResponse> collectCallable;
@@ -141,6 +153,8 @@ public class GrpcEchoStub extends EchoStub {
   private final OperationCallable<WaitRequest, WaitResponse, WaitMetadata> waitOperationCallable;
   private final UnaryCallable<BlockRequest, BlockResponse> blockCallable;
   private final UnaryCallable<EchoRequest, Object> collideNameCallable;
+  private final UnaryCallable<PagedExpandLegacyRequest, PagedExpandResponse>
+      pagedExpandLegacyCallable;
 
   private final BackgroundResource backgroundResources;
   private final GrpcOperationsStub operationsStub;
@@ -220,6 +234,11 @@ public class GrpcEchoStub extends EchoStub {
         GrpcCallSettings.<EchoRequest, Object>newBuilder()
             .setMethodDescriptor(collideNameMethodDescriptor)
             .build();
+    GrpcCallSettings<PagedExpandLegacyRequest, PagedExpandResponse>
+        pagedExpandLegacyTransportSettings =
+            GrpcCallSettings.<PagedExpandLegacyRequest, PagedExpandResponse>newBuilder()
+                .setMethodDescriptor(pagedExpandLegacyMethodDescriptor)
+                .build();
 
     this.echoCallable =
         callableFactory.createUnaryCallable(
@@ -264,6 +283,11 @@ public class GrpcEchoStub extends EchoStub {
     this.collideNameCallable =
         callableFactory.createUnaryCallable(
             collideNameTransportSettings, settings.collideNameSettings(), clientContext);
+    this.pagedExpandLegacyCallable =
+        callableFactory.createUnaryCallable(
+            pagedExpandLegacyTransportSettings,
+            settings.pagedExpandLegacySettings(),
+            clientContext);
 
     this.backgroundResources =
         new BackgroundResourceAggregation(clientContext.getBackgroundResources());
@@ -339,6 +363,11 @@ public class GrpcEchoStub extends EchoStub {
     return collideNameCallable;
   }
 
+  @Override
+  public UnaryCallable<PagedExpandLegacyRequest, PagedExpandResponse> pagedExpandLegacyCallable() {
+    return pagedExpandLegacyCallable;
+  }
+
   @Override
   public final void close() {
     try {
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/JobServiceStubSettings.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/JobServiceStubSettings.golden
new file mode 100644
index 0000000000..d4bf730476
--- /dev/null
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/JobServiceStubSettings.golden
@@ -0,0 +1,376 @@
+package com.google.cloud.bigquery.v2.stub;
+
+import static com.google.cloud.bigquery.v2.JobServiceClient.ListJobsPagedResponse;
+
+import com.google.api.core.ApiFunction;
+import com.google.api.core.ApiFuture;
+import com.google.api.core.ObsoleteApi;
+import com.google.api.gax.core.GaxProperties;
+import com.google.api.gax.core.GoogleCredentialsProvider;
+import com.google.api.gax.core.InstantiatingExecutorProvider;
+import com.google.api.gax.grpc.GaxGrpcProperties;
+import com.google.api.gax.grpc.GrpcTransportChannel;
+import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
+import com.google.api.gax.retrying.RetrySettings;
+import com.google.api.gax.rpc.ApiCallContext;
+import com.google.api.gax.rpc.ApiClientHeaderProvider;
+import com.google.api.gax.rpc.ClientContext;
+import com.google.api.gax.rpc.PageContext;
+import com.google.api.gax.rpc.PagedCallSettings;
+import com.google.api.gax.rpc.PagedListDescriptor;
+import com.google.api.gax.rpc.PagedListResponseFactory;
+import com.google.api.gax.rpc.StatusCode;
+import com.google.api.gax.rpc.StubSettings;
+import com.google.api.gax.rpc.TransportChannelProvider;
+import com.google.api.gax.rpc.UnaryCallSettings;
+import com.google.api.gax.rpc.UnaryCallable;
+import com.google.cloud.bigquery.v2.JobProto;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+import com.google.protobuf.Empty;
+import com.google.protobuf.Int32Value;
+import java.io.IOException;
+import java.time.Duration;
+import java.util.List;
+import javax.annotation.Generated;
+
+// AUTO-GENERATED DOCUMENTATION AND CLASS.
+/**
+ * Settings class to configure an instance of {@link JobServiceStub}.
+ *
+ * <p>The default instance has everything set to sensible defaults:
+ *
+ * <ul>
+ *   <li>The default service address (bigquery.googleapis.com) and default port (443) are used.
+ *   <li>Credentials are acquired automatically through Application Default Credentials.
+ *   <li>Retries are configured for idempotent methods but not for non-idempotent methods.
+ * </ul>
+ *
+ * <p>The builder of this class is recursive, so contained classes are themselves builders. When
+ * build() is called, the tree of builders is called to create the complete settings object.
+ *
+ * <p>For example, to set the
+ * [RetrySettings](https://cloud.google.com/java/docs/reference/gax/latest/com.google.api.gax.retrying.RetrySettings)
+ * of deleteJob:
+ *
+ * <pre>{@code
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
+ * JobServiceStubSettings.Builder jobServiceSettingsBuilder = JobServiceStubSettings.newBuilder();
+ * jobServiceSettingsBuilder
+ *     .deleteJobSettings()
+ *     .setRetrySettings(
+ *         jobServiceSettingsBuilder
+ *             .deleteJobSettings()
+ *             .getRetrySettings()
+ *             .toBuilder()
+ *             .setInitialRetryDelayDuration(Duration.ofSeconds(1))
+ *             .setInitialRpcTimeoutDuration(Duration.ofSeconds(5))
+ *             .setMaxAttempts(5)
+ *             .setMaxRetryDelayDuration(Duration.ofSeconds(30))
+ *             .setMaxRpcTimeoutDuration(Duration.ofSeconds(60))
+ *             .setRetryDelayMultiplier(1.3)
+ *             .setRpcTimeoutMultiplier(1.5)
+ *             .setTotalTimeoutDuration(Duration.ofSeconds(300))
+ *             .build());
+ * JobServiceStubSettings jobServiceSettings = jobServiceSettingsBuilder.build();
+ * }</pre>
+ *
+ * Please refer to the [Client Side Retry
+ * Guide](https://github.com/googleapis/google-cloud-java/blob/main/docs/client_retries.md) for
+ * additional support in setting retries.
+ */
+@Generated("by gapic-generator-java")
+public class JobServiceStubSettings extends StubSettings<JobServiceStubSettings> {
+  /** The default scopes of the service. */
+  private static final ImmutableList<String> DEFAULT_SERVICE_SCOPES =
+      ImmutableList.<String>builder()
+          .add("https://www.googleapis.com/auth/bigquery")
+          .add("https://www.googleapis.com/auth/cloud-platform")
+          .add("https://www.googleapis.com/auth/cloud-platform.read-only")
+          .add("https://www.googleapis.com/auth/devstorage.full_control")
+          .add("https://www.googleapis.com/auth/devstorage.read_only")
+          .add("https://www.googleapis.com/auth/devstorage.read_write")
+          .build();
+
+  private final UnaryCallSettings<JobProto.DeleteJobRequest, Empty> deleteJobSettings;
+  private final PagedCallSettings<JobProto.ListJobsRequest, JobProto.JobList, ListJobsPagedResponse>
+      listJobsSettings;
+
+  private static final PagedListDescriptor<
+          JobProto.ListJobsRequest, JobProto.JobList, JobProto.ListFormatJob>
+      LIST_JOBS_PAGE_STR_DESC =
+          new PagedListDescriptor<
+              JobProto.ListJobsRequest, JobProto.JobList, JobProto.ListFormatJob>() {
+            @Override
+            public String emptyToken() {
+              return "";
+            }
+
+            @Override
+            public JobProto.ListJobsRequest injectToken(
+                JobProto.ListJobsRequest payload, String token) {
+              return JobProto.ListJobsRequest.newBuilder(payload).setPageToken(token).build();
+            }
+
+            @Override
+            public JobProto.ListJobsRequest injectPageSize(
+                JobProto.ListJobsRequest payload, int pageSize) {
+              return JobProto.ListJobsRequest.newBuilder(payload)
+                  .setMaxResults(Int32Value.of(pageSize))
+                  .build();
+            }
+
+            @Override
+            public Integer extractPageSize(JobProto.ListJobsRequest payload) {
+              return payload.getMaxResults().getValue();
+            }
+
+            @Override
+            public String extractNextToken(JobProto.JobList payload) {
+              return payload.getNextPageToken();
+            }
+
+            @Override
+            public Iterable<JobProto.ListFormatJob> extractResources(JobProto.JobList payload) {
+              return payload.getJobsList();
+            }
+          };
+
+  private static final PagedListResponseFactory<
+          JobProto.ListJobsRequest, JobProto.JobList, ListJobsPagedResponse>
+      LIST_JOBS_PAGE_STR_FACT =
+          new PagedListResponseFactory<
+              JobProto.ListJobsRequest, JobProto.JobList, ListJobsPagedResponse>() {
+            @Override
+            public ApiFuture<ListJobsPagedResponse> getFuturePagedResponse(
+                UnaryCallable<JobProto.ListJobsRequest, JobProto.JobList> callable,
+                JobProto.ListJobsRequest request,
+                ApiCallContext context,
+                ApiFuture<JobProto.JobList> futureResponse) {
+              PageContext<JobProto.ListJobsRequest, JobProto.JobList, JobProto.ListFormatJob>
+                  pageContext =
+                      PageContext.create(callable, LIST_JOBS_PAGE_STR_DESC, request, context);
+              return ListJobsPagedResponse.createAsync(pageContext, futureResponse);
+            }
+          };
+
+  /** Returns the object with the settings used for calls to deleteJob. */
+  public UnaryCallSettings<JobProto.DeleteJobRequest, Empty> deleteJobSettings() {
+    return deleteJobSettings;
+  }
+
+  /** Returns the object with the settings used for calls to listJobs. */
+  public PagedCallSettings<JobProto.ListJobsRequest, JobProto.JobList, ListJobsPagedResponse>
+      listJobsSettings() {
+    return listJobsSettings;
+  }
+
+  public JobServiceStub createStub() throws IOException {
+    if (getTransportChannelProvider()
+        .getTransportName()
+        .equals(GrpcTransportChannel.getGrpcTransportName())) {
+      return GrpcJobServiceStub.create(this);
+    }
+    throw new UnsupportedOperationException(
+        String.format(
+            "Transport not supported: %s", getTransportChannelProvider().getTransportName()));
+  }
+
+  /** Returns the default service name. */
+  @Override
+  public String getServiceName() {
+    return "bigquery";
+  }
+
+  /** Returns a builder for the default ExecutorProvider for this service. */
+  public static InstantiatingExecutorProvider.Builder defaultExecutorProviderBuilder() {
+    return InstantiatingExecutorProvider.newBuilder();
+  }
+
+  /** Returns the default service endpoint. */
+  @ObsoleteApi("Use getEndpoint() instead")
+  public static String getDefaultEndpoint() {
+    return "bigquery.googleapis.com:443";
+  }
+
+  /** Returns the default mTLS service endpoint. */
+  public static String getDefaultMtlsEndpoint() {
+    return "bigquery.mtls.googleapis.com:443";
+  }
+
+  /** Returns the default service scopes. */
+  public static List<String> getDefaultServiceScopes() {
+    return DEFAULT_SERVICE_SCOPES;
+  }
+
+  /** Returns a builder for the default credentials for this service. */
+  public static GoogleCredentialsProvider.Builder defaultCredentialsProviderBuilder() {
+    return GoogleCredentialsProvider.newBuilder()
+        .setScopesToApply(DEFAULT_SERVICE_SCOPES)
+        .setUseJwtAccessWithScope(true);
+  }
+
+  /** Returns a builder for the default ChannelProvider for this service. */
+  public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProviderBuilder() {
+    return InstantiatingGrpcChannelProvider.newBuilder()
+        .setMaxInboundMessageSize(Integer.MAX_VALUE);
+  }
+
+  public static TransportChannelProvider defaultTransportChannelProvider() {
+    return defaultGrpcTransportProviderBuilder().build();
+  }
+
+  public static ApiClientHeaderProvider.Builder defaultApiClientHeaderProviderBuilder() {
+    return ApiClientHeaderProvider.newBuilder()
+        .setGeneratedLibToken(
+            "gapic", GaxProperties.getLibraryVersion(JobServiceStubSettings.class))
+        .setTransportToken(
+            GaxGrpcProperties.getGrpcTokenName(), GaxGrpcProperties.getGrpcVersion());
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder() {
+    return Builder.createDefault();
+  }
+
+  /** Returns a new builder for this class. */
+  public static Builder newBuilder(ClientContext clientContext) {
+    return new Builder(clientContext);
+  }
+
+  /** Returns a builder containing all the values of this settings class. */
+  public Builder toBuilder() {
+    return new Builder(this);
+  }
+
+  protected JobServiceStubSettings(Builder settingsBuilder) throws IOException {
+    super(settingsBuilder);
+
+    deleteJobSettings = settingsBuilder.deleteJobSettings().build();
+    listJobsSettings = settingsBuilder.listJobsSettings().build();
+  }
+
+  /** Builder for JobServiceStubSettings. */
+  public static class Builder extends StubSettings.Builder<JobServiceStubSettings, Builder> {
+    private final ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders;
+    private final UnaryCallSettings.Builder<JobProto.DeleteJobRequest, Empty> deleteJobSettings;
+    private final PagedCallSettings.Builder<
+            JobProto.ListJobsRequest, JobProto.JobList, ListJobsPagedResponse>
+        listJobsSettings;
+    private static final ImmutableMap<String, ImmutableSet<StatusCode.Code>>
+        RETRYABLE_CODE_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, ImmutableSet<StatusCode.Code>> definitions =
+          ImmutableMap.builder();
+      definitions.put(
+          "no_retry_0_codes", ImmutableSet.copyOf(Lists.<StatusCode.Code>newArrayList()));
+      RETRYABLE_CODE_DEFINITIONS = definitions.build();
+    }
+
+    private static final ImmutableMap<String, RetrySettings> RETRY_PARAM_DEFINITIONS;
+
+    static {
+      ImmutableMap.Builder<String, RetrySettings> definitions = ImmutableMap.builder();
+      RetrySettings settings = null;
+      settings =
+          RetrySettings.newBuilder()
+              .setInitialRpcTimeoutDuration(Duration.ofMillis(5000L))
+              .setRpcTimeoutMultiplier(1.0)
+              .setMaxRpcTimeoutDuration(Duration.ofMillis(5000L))
+              .setTotalTimeoutDuration(Duration.ofMillis(5000L))
+              .build();
+      definitions.put("no_retry_0_params", settings);
+      RETRY_PARAM_DEFINITIONS = definitions.build();
+    }
+
+    protected Builder() {
+      this(((ClientContext) null));
+    }
+
+    protected Builder(ClientContext clientContext) {
+      super(clientContext);
+
+      deleteJobSettings = UnaryCallSettings.newUnaryCallSettingsBuilder();
+      listJobsSettings = PagedCallSettings.newBuilder(LIST_JOBS_PAGE_STR_FACT);
+
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(deleteJobSettings, listJobsSettings);
+      initDefaults(this);
+    }
+
+    protected Builder(JobServiceStubSettings settings) {
+      super(settings);
+
+      deleteJobSettings = settings.deleteJobSettings.toBuilder();
+      listJobsSettings = settings.listJobsSettings.toBuilder();
+
+      unaryMethodSettingsBuilders =
+          ImmutableList.<UnaryCallSettings.Builder<?, ?>>of(deleteJobSettings, listJobsSettings);
+    }
+
+    private static Builder createDefault() {
+      Builder builder = new Builder(((ClientContext) null));
+
+      builder.setTransportChannelProvider(defaultTransportChannelProvider());
+      builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());
+      builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());
+      builder.setMtlsEndpoint(getDefaultMtlsEndpoint());
+      builder.setSwitchToMtlsEndpointAllowed(true);
+
+      return initDefaults(builder);
+    }
+
+    private static Builder initDefaults(Builder builder) {
+      builder
+          .deleteJobSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("no_retry_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("no_retry_0_params"));
+
+      builder
+          .listJobsSettings()
+          .setRetryableCodes(RETRYABLE_CODE_DEFINITIONS.get("no_retry_0_codes"))
+          .setRetrySettings(RETRY_PARAM_DEFINITIONS.get("no_retry_0_params"));
+
+      return builder;
+    }
+
+    /**
+     * 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) {
+      super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);
+      return this;
+    }
+
+    public ImmutableList<UnaryCallSettings.Builder<?, ?>> unaryMethodSettingsBuilders() {
+      return unaryMethodSettingsBuilders;
+    }
+
+    /** Returns the builder for the settings used for calls to deleteJob. */
+    public UnaryCallSettings.Builder<JobProto.DeleteJobRequest, Empty> deleteJobSettings() {
+      return deleteJobSettings;
+    }
+
+    /** Returns the builder for the settings used for calls to listJobs. */
+    public PagedCallSettings.Builder<
+            JobProto.ListJobsRequest, JobProto.JobList, ListJobsPagedResponse>
+        listJobsSettings() {
+      return listJobsSettings;
+    }
+
+    @Override
+    public JobServiceStubSettings build() throws IOException {
+      return new JobServiceStubSettings(this);
+    }
+  }
+}
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/MockEchoImpl.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/MockEchoImpl.golden
index ae3ff13888..f8b42faff0 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/MockEchoImpl.golden
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/MockEchoImpl.golden
@@ -293,4 +293,25 @@ public class MockEchoImpl extends EchoImplBase {
                   Exception.class.getName())));
     }
   }
+
+  @Override
+  public void pagedExpandLegacy(
+      PagedExpandLegacyRequest request, StreamObserver<PagedExpandResponse> responseObserver) {
+    java.lang.Object response = responses.poll();
+    if (response instanceof PagedExpandResponse) {
+      requests.add(request);
+      responseObserver.onNext(((PagedExpandResponse) response));
+      responseObserver.onCompleted();
+    } else if (response instanceof Exception) {
+      responseObserver.onError(((Exception) response));
+    } else {
+      responseObserver.onError(
+          new IllegalArgumentException(
+              String.format(
+                  "Unrecognized response type %s for method PagedExpandLegacy, expected %s or %s",
+                  response == null ? "null" : response.getClass().getName(),
+                  PagedExpandResponse.class.getName(),
+                  Exception.class.getName())));
+    }
+  }
 }
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncPagedExpandLegacy.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncPagedExpandLegacy.golden
new file mode 100644
index 0000000000..04fdf3b93f
--- /dev/null
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/AsyncPagedExpandLegacy.golden
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_Echo_PagedExpandLegacy_async]
+import com.google.api.core.ApiFuture;
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.PagedExpandLegacyRequest;
+import com.google.showcase.v1beta1.PagedExpandResponse;
+
+public class AsyncPagedExpandLegacy {
+
+  public static void main(String[] args) throws Exception {
+    asyncPagedExpandLegacy();
+  }
+
+  public static void asyncPagedExpandLegacy() throws Exception {
+    // This snippet has been automatically generated and should be regarded as a code template only.
+    // It will require modifications to work:
+    // - It may require correct/in-range values for request initialization.
+    // - It may require specifying regional endpoints when creating the service client as shown in
+    // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
+    try (EchoClient echoClient = EchoClient.create()) {
+      PagedExpandLegacyRequest request =
+          PagedExpandLegacyRequest.newBuilder()
+              .setContent("content951530617")
+              .setMaxResults(1128457243)
+              .setPageToken("pageToken873572522")
+              .build();
+      ApiFuture<PagedExpandResponse> future =
+          echoClient.pagedExpandLegacyCallable().futureCall(request);
+      // Do something.
+      PagedExpandResponse response = future.get();
+    }
+  }
+}
+// [END goldensample_generated_Echo_PagedExpandLegacy_async]
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncPagedExpandLegacy.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncPagedExpandLegacy.golden
new file mode 100644
index 0000000000..51a0bad09a
--- /dev/null
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/echoclient/SyncPagedExpandLegacy.golden
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.showcase.v1beta1.samples;
+
+// [START goldensample_generated_Echo_PagedExpandLegacy_sync]
+import com.google.showcase.v1beta1.EchoClient;
+import com.google.showcase.v1beta1.PagedExpandLegacyRequest;
+import com.google.showcase.v1beta1.PagedExpandResponse;
+
+public class SyncPagedExpandLegacy {
+
+  public static void main(String[] args) throws Exception {
+    syncPagedExpandLegacy();
+  }
+
+  public static void syncPagedExpandLegacy() throws Exception {
+    // This snippet has been automatically generated and should be regarded as a code template only.
+    // It will require modifications to work:
+    // - It may require correct/in-range values for request initialization.
+    // - It may require specifying regional endpoints when creating the service client as shown in
+    // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
+    try (EchoClient echoClient = EchoClient.create()) {
+      PagedExpandLegacyRequest request =
+          PagedExpandLegacyRequest.newBuilder()
+              .setContent("content951530617")
+              .setMaxResults(1128457243)
+              .setPageToken("pageToken873572522")
+              .build();
+      PagedExpandResponse response = echoClient.pagedExpandLegacy(request);
+    }
+  }
+}
+// [END goldensample_generated_Echo_PagedExpandLegacy_sync]
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncDeleteJob.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncDeleteJob.golden
new file mode 100644
index 0000000000..db01c32cd8
--- /dev/null
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncDeleteJob.golden
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.bigquery.v2.stub.samples;
+
+// [START goldensample_generated_JobServiceStubSettings_DeleteJob_sync]
+import com.google.cloud.bigquery.v2.stub.JobServiceStubSettings;
+import java.time.Duration;
+
+public class SyncDeleteJob {
+
+  public static void main(String[] args) throws Exception {
+    syncDeleteJob();
+  }
+
+  public static void syncDeleteJob() throws Exception {
+    // This snippet has been automatically generated and should be regarded as a code template only.
+    // It will require modifications to work:
+    // - It may require correct/in-range values for request initialization.
+    // - It may require specifying regional endpoints when creating the service client as shown in
+    // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
+    JobServiceStubSettings.Builder jobServiceSettingsBuilder = JobServiceStubSettings.newBuilder();
+    jobServiceSettingsBuilder
+        .deleteJobSettings()
+        .setRetrySettings(
+            jobServiceSettingsBuilder
+                .deleteJobSettings()
+                .getRetrySettings()
+                .toBuilder()
+                .setInitialRetryDelayDuration(Duration.ofSeconds(1))
+                .setInitialRpcTimeoutDuration(Duration.ofSeconds(5))
+                .setMaxAttempts(5)
+                .setMaxRetryDelayDuration(Duration.ofSeconds(30))
+                .setMaxRpcTimeoutDuration(Duration.ofSeconds(60))
+                .setRetryDelayMultiplier(1.3)
+                .setRpcTimeoutMultiplier(1.5)
+                .setTotalTimeoutDuration(Duration.ofSeconds(300))
+                .build());
+    JobServiceStubSettings jobServiceSettings = jobServiceSettingsBuilder.build();
+  }
+}
+// [END goldensample_generated_JobServiceStubSettings_DeleteJob_sync]
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncListJobs.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncListJobs.golden
new file mode 100644
index 0000000000..ba4be080cd
--- /dev/null
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpc/goldens/samples/servicesettings/stub/SyncListJobs.golden
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.bigquery.v2.stub.samples;
+
+// [START goldensample_generated_JobServiceStubSettings_ListJobs_sync]
+import com.google.cloud.bigquery.v2.stub.JobServiceStubSettings;
+import java.time.Duration;
+
+public class SyncListJobs {
+
+  public static void main(String[] args) throws Exception {
+    syncListJobs();
+  }
+
+  public static void syncListJobs() throws Exception {
+    // This snippet has been automatically generated and should be regarded as a code template only.
+    // It will require modifications to work:
+    // - It may require correct/in-range values for request initialization.
+    // - It may require specifying regional endpoints when creating the service client as shown in
+    // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
+    JobServiceStubSettings.Builder jobServiceSettingsBuilder = JobServiceStubSettings.newBuilder();
+    jobServiceSettingsBuilder
+        .listJobsSettings()
+        .setRetrySettings(
+            jobServiceSettingsBuilder
+                .listJobsSettings()
+                .getRetrySettings()
+                .toBuilder()
+                .setInitialRetryDelayDuration(Duration.ofSeconds(1))
+                .setInitialRpcTimeoutDuration(Duration.ofSeconds(5))
+                .setMaxAttempts(5)
+                .setMaxRetryDelayDuration(Duration.ofSeconds(30))
+                .setMaxRpcTimeoutDuration(Duration.ofSeconds(60))
+                .setRetryDelayMultiplier(1.3)
+                .setRpcTimeoutMultiplier(1.5)
+                .setTotalTimeoutDuration(Duration.ofSeconds(300))
+                .build());
+    JobServiceStubSettings jobServiceSettings = jobServiceSettingsBuilder.build();
+  }
+}
+// [END goldensample_generated_JobServiceStubSettings_ListJobs_sync]
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/HttpJsonEchoStub.golden b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/HttpJsonEchoStub.golden
index 18904bdfbe..85129de60b 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/HttpJsonEchoStub.golden
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/rest/goldens/HttpJsonEchoStub.golden
@@ -32,6 +32,7 @@ import com.google.showcase.v1beta1.EchoRequest;
 import com.google.showcase.v1beta1.EchoResponse;
 import com.google.showcase.v1beta1.ExpandRequest;
 import com.google.showcase.v1beta1.Object;
+import com.google.showcase.v1beta1.PagedExpandLegacyRequest;
 import com.google.showcase.v1beta1.PagedExpandRequest;
 import com.google.showcase.v1beta1.PagedExpandResponse;
 import com.google.showcase.v1beta1.WaitMetadata;
@@ -302,6 +303,42 @@ public class HttpJsonEchoStub extends EchoStub {
                   .build())
           .build();
 
+  private static final ApiMethodDescriptor<PagedExpandLegacyRequest, PagedExpandResponse>
+      pagedExpandLegacyMethodDescriptor =
+          ApiMethodDescriptor.<PagedExpandLegacyRequest, PagedExpandResponse>newBuilder()
+              .setFullMethodName("google.showcase.v1beta1.Echo/PagedExpandLegacy")
+              .setHttpMethod("POST")
+              .setType(ApiMethodDescriptor.MethodType.UNARY)
+              .setRequestFormatter(
+                  ProtoMessageRequestFormatter.<PagedExpandLegacyRequest>newBuilder()
+                      .setPath(
+                          "/v1beta1/echo:pagedExpandLegacy",
+                          request -> {
+                            Map<String, String> fields = new HashMap<>();
+                            ProtoRestSerializer<PagedExpandLegacyRequest> serializer =
+                                ProtoRestSerializer.create();
+                            return fields;
+                          })
+                      .setQueryParamsExtractor(
+                          request -> {
+                            Map<String, List<String>> fields = new HashMap<>();
+                            ProtoRestSerializer<PagedExpandLegacyRequest> serializer =
+                                ProtoRestSerializer.create();
+                            serializer.putQueryParam(fields, "$alt", "json;enum-encoding=int");
+                            return fields;
+                          })
+                      .setRequestBodyExtractor(
+                          request ->
+                              ProtoRestSerializer.create()
+                                  .toBody("*", request.toBuilder().build(), true))
+                      .build())
+              .setResponseParser(
+                  ProtoMessageResponseParser.<PagedExpandResponse>newBuilder()
+                      .setDefaultInstance(PagedExpandResponse.getDefaultInstance())
+                      .setDefaultTypeRegistry(typeRegistry)
+                      .build())
+              .build();
+
   private final UnaryCallable<EchoRequest, EchoResponse> echoCallable;
   private final ServerStreamingCallable<ExpandRequest, EchoResponse> expandCallable;
   private final UnaryCallable<PagedExpandRequest, PagedExpandResponse> pagedExpandCallable;
@@ -314,6 +351,8 @@ public class HttpJsonEchoStub extends EchoStub {
   private final OperationCallable<WaitRequest, WaitResponse, WaitMetadata> waitOperationCallable;
   private final UnaryCallable<BlockRequest, BlockResponse> blockCallable;
   private final UnaryCallable<EchoRequest, Object> collideNameCallable;
+  private final UnaryCallable<PagedExpandLegacyRequest, PagedExpandResponse>
+      pagedExpandLegacyCallable;
 
   private final BackgroundResource backgroundResources;
   private final HttpJsonOperationsStub httpJsonOperationsStub;
@@ -440,6 +479,12 @@ public class HttpJsonEchoStub extends EchoStub {
             .setMethodDescriptor(collideNameMethodDescriptor)
             .setTypeRegistry(typeRegistry)
             .build();
+    HttpJsonCallSettings<PagedExpandLegacyRequest, PagedExpandResponse>
+        pagedExpandLegacyTransportSettings =
+            HttpJsonCallSettings.<PagedExpandLegacyRequest, PagedExpandResponse>newBuilder()
+                .setMethodDescriptor(pagedExpandLegacyMethodDescriptor)
+                .setTypeRegistry(typeRegistry)
+                .build();
 
     this.echoCallable =
         callableFactory.createUnaryCallable(
@@ -478,6 +523,11 @@ public class HttpJsonEchoStub extends EchoStub {
     this.collideNameCallable =
         callableFactory.createUnaryCallable(
             collideNameTransportSettings, settings.collideNameSettings(), clientContext);
+    this.pagedExpandLegacyCallable =
+        callableFactory.createUnaryCallable(
+            pagedExpandLegacyTransportSettings,
+            settings.pagedExpandLegacySettings(),
+            clientContext);
 
     this.backgroundResources =
         new BackgroundResourceAggregation(clientContext.getBackgroundResources());
@@ -493,6 +543,7 @@ public class HttpJsonEchoStub extends EchoStub {
     methodDescriptors.add(waitMethodDescriptor);
     methodDescriptors.add(blockMethodDescriptor);
     methodDescriptors.add(collideNameMethodDescriptor);
+    methodDescriptors.add(pagedExpandLegacyMethodDescriptor);
     return methodDescriptors;
   }
 
@@ -551,6 +602,11 @@ public class HttpJsonEchoStub extends EchoStub {
     return collideNameCallable;
   }
 
+  @Override
+  public UnaryCallable<PagedExpandLegacyRequest, PagedExpandResponse> pagedExpandLegacyCallable() {
+    return pagedExpandLegacyCallable;
+  }
+
   @Override
   public ClientStreamingCallable<EchoRequest, EchoResponse> collectCallable() {
     throw new UnsupportedOperationException(
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/protoparser/ParserTest.java b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/protoparser/ParserTest.java
index 6ddf533cbb..e6325ded69 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/gapic/protoparser/ParserTest.java
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/gapic/protoparser/ParserTest.java
@@ -46,6 +46,7 @@
 import com.google.api.version.test.ApiVersionTestingOuterClass;
 import com.google.auto.populate.field.AutoPopulateFieldTestingOuterClass;
 import com.google.bookshop.v1beta1.BookshopProto;
+import com.google.cloud.bigquery.v2.JobProto;
 import com.google.common.collect.ImmutableList;
 import com.google.common.truth.Truth;
 import com.google.protobuf.Descriptors.FileDescriptor;
@@ -154,7 +155,7 @@ void parseMethods_basic() {
             outputResourceNames,
             Transport.GRPC);
 
-    assertEquals(10, methods.size());
+    assertEquals(11, methods.size());
 
     // Methods should appear in the same order as in the protobuf file.
     Method echoMethod = methods.get(0);
@@ -218,7 +219,7 @@ void parseMethods_basicLro() {
             outputResourceNames,
             Transport.GRPC);
 
-    assertEquals(10, methods.size());
+    assertEquals(11, methods.size());
 
     // Methods should appear in the same order as in the protobuf file.
     Method waitMethod = methods.get(7);
@@ -373,6 +374,50 @@ void parseMethodSignatures_basic() {
         argument);
   }
 
+  @Test
+  void parsePageSizeFieldName_basic() {
+    MethodDescriptor methodDescriptor = echoService.getMethods().get(5);
+    assertEquals("PagedExpand", methodDescriptor.getName());
+    Map<String, Message> messageTypes = Parser.parseMessages(echoFileDescriptor);
+    String pageSizeFieldName =
+        Parser.parsePageSizeFieldName(methodDescriptor, messageTypes, Transport.GRPC);
+    assertEquals("page_size", pageSizeFieldName);
+  }
+
+  @Test
+  void parsePageSizeFieldName_grpcLegacy() {
+    MethodDescriptor methodDescriptor = echoService.getMethods().get(10);
+    assertEquals("PagedExpandLegacy", methodDescriptor.getName());
+    Map<String, Message> messageTypes = Parser.parseMessages(echoFileDescriptor);
+    String pageSizeFieldName =
+        Parser.parsePageSizeFieldName(methodDescriptor, messageTypes, Transport.GRPC);
+    assertNull(pageSizeFieldName);
+  }
+
+  @Test
+  void parsePageSizeFieldName_restLegacy() {
+    MethodDescriptor methodDescriptor = echoService.getMethods().get(10);
+    assertEquals("PagedExpandLegacy", methodDescriptor.getName());
+    Map<String, Message> messageTypes = Parser.parseMessages(echoFileDescriptor);
+    String pageSizeFieldName =
+        Parser.parsePageSizeFieldName(methodDescriptor, messageTypes, Transport.REST);
+    assertEquals("max_results", pageSizeFieldName);
+  }
+
+  @Test
+  void parsePageSizeFieldName_bigqueryLegacy() {
+    FileDescriptor bqJobFileDescriptor = JobProto.getDescriptor();
+    ServiceDescriptor jobService = bqJobFileDescriptor.getServices().get(0);
+    MethodDescriptor deleteJobMethodDescriptor = jobService.getMethods().get(0);
+    assertEquals("DeleteJob", deleteJobMethodDescriptor.getName());
+    MethodDescriptor listJobsMethodDescriptor = jobService.getMethods().get(1);
+    assertEquals("ListJobs", listJobsMethodDescriptor.getName());
+    Map<String, Message> messageTypes = Parser.parseMessages(bqJobFileDescriptor);
+    String pageSizeFieldName =
+        Parser.parsePageSizeFieldName(listJobsMethodDescriptor, messageTypes, Transport.GRPC);
+    assertEquals("max_results", pageSizeFieldName);
+  }
+
   @Test
   void parseMessagesAndResourceNames_update() {
     FileDescriptor lockerServiceFileDescriptor = LockerProto.getDescriptor();
diff --git a/gapic-generator-java/src/test/java/com/google/api/generator/test/protoloader/TestProtoLoader.java b/gapic-generator-java/src/test/java/com/google/api/generator/test/protoloader/TestProtoLoader.java
index 1030e8231e..0e4148110e 100644
--- a/gapic-generator-java/src/test/java/com/google/api/generator/test/protoloader/TestProtoLoader.java
+++ b/gapic-generator-java/src/test/java/com/google/api/generator/test/protoloader/TestProtoLoader.java
@@ -31,6 +31,7 @@
 import com.google.api.version.test.ApiVersionTestingOuterClass;
 import com.google.auto.populate.field.AutoPopulateFieldTestingOuterClass;
 import com.google.bookshop.v1beta1.BookshopProto;
+import com.google.cloud.bigquery.v2.JobProto;
 import com.google.explicit.dynamic.routing.header.ExplicitDynamicRoutingHeaderTestingOuterClass;
 import com.google.logging.v2.LogEntryProto;
 import com.google.logging.v2.LoggingConfigProto;
@@ -86,7 +87,7 @@ public static TestProtoLoader instance() {
   public GapicContext parseDeprecatedService() {
     FileDescriptor fileDescriptor = DeprecatedServiceOuterClass.getDescriptor();
     ServiceDescriptor serviceDescriptor = fileDescriptor.getServices().get(0);
-    assertEquals(serviceDescriptor.getName(), "DeprecatedService");
+    assertEquals("DeprecatedService", serviceDescriptor.getName());
 
     Map<String, Message> messageTypes = Parser.parseMessages(fileDescriptor);
     Map<String, ResourceName> resourceNames = new HashMap<>();
@@ -114,7 +115,7 @@ public GapicContext parseDeprecatedService() {
   public GapicContext parseBookshopService() {
     FileDescriptor fileDescriptor = BookshopProto.getDescriptor();
     ServiceDescriptor serviceDescriptor = fileDescriptor.getServices().get(0);
-    assertEquals(serviceDescriptor.getName(), "Bookshop");
+    assertEquals("Bookshop", serviceDescriptor.getName());
 
     Map<String, Message> messageTypes = Parser.parseMessages(fileDescriptor);
     Map<String, ResourceName> resourceNames = new HashMap<>();
@@ -142,7 +143,7 @@ public GapicContext parseBookshopService() {
   public GapicContext parseNestedMessage() {
     FileDescriptor fileDescriptor = TypesTestingProto.getDescriptor();
     ServiceDescriptor serviceDescriptor = fileDescriptor.getServices().get(0);
-    assertEquals(serviceDescriptor.getName(), "NestedMessageService");
+    assertEquals("NestedMessageService", serviceDescriptor.getName());
     Map<String, Message> messageTypes = Parser.parseMessages(fileDescriptor);
 
     FileDescriptor messageFileDescriptor = NestedMessageProto.getDescriptor();
@@ -166,7 +167,7 @@ public GapicContext parseNestedMessage() {
   public GapicContext parseShowcaseEcho() {
     FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
     ServiceDescriptor echoServiceDescriptor = echoFileDescriptor.getServices().get(0);
-    assertEquals(echoServiceDescriptor.getName(), "Echo");
+    assertEquals("Echo", echoServiceDescriptor.getName());
 
     String serviceYamlFilename = "echo_v1beta1.yaml";
     Path serviceYamlPath = Paths.get(testFilesDirectory, serviceYamlFilename);
@@ -207,7 +208,7 @@ public GapicContext parseShowcaseEcho() {
   public GapicContext parseShowcaseIdentity() {
     FileDescriptor fileDescriptor = IdentityOuterClass.getDescriptor();
     ServiceDescriptor identityService = fileDescriptor.getServices().get(0);
-    assertEquals(identityService.getName(), "Identity");
+    assertEquals("Identity", identityService.getName());
 
     Map<String, Message> messageTypes = Parser.parseMessages(fileDescriptor);
     Map<String, ResourceName> resourceNames = Parser.parseResourceNames(fileDescriptor);
@@ -228,7 +229,7 @@ public GapicContext parseShowcaseIdentity() {
   public GapicContext parseShowcaseMessaging() {
     FileDescriptor fileDescriptor = MessagingOuterClass.getDescriptor();
     ServiceDescriptor messagingService = fileDescriptor.getServices().get(0);
-    assertEquals(messagingService.getName(), "Messaging");
+    assertEquals("Messaging", messagingService.getName());
 
     Map<String, Message> messageTypes = Parser.parseMessages(fileDescriptor);
     Map<String, ResourceName> resourceNames = Parser.parseResourceNames(fileDescriptor);
@@ -249,7 +250,7 @@ public GapicContext parseShowcaseMessaging() {
   public GapicContext parseShowcaseTesting() {
     FileDescriptor testingFileDescriptor = TestingOuterClass.getDescriptor();
     ServiceDescriptor testingService = testingFileDescriptor.getServices().get(0);
-    assertEquals(testingService.getName(), "Testing");
+    assertEquals("Testing", testingService.getName());
 
     Map<String, Message> messageTypes = Parser.parseMessages(testingFileDescriptor);
     Map<String, ResourceName> resourceNames = Parser.parseResourceNames(testingFileDescriptor);
@@ -275,7 +276,7 @@ public GapicContext parseExplicitDynamicRoutingHeaderTesting() {
     FileDescriptor testingFileDescriptor =
         ExplicitDynamicRoutingHeaderTestingOuterClass.getDescriptor();
     ServiceDescriptor testingService = testingFileDescriptor.getServices().get(0);
-    assertEquals(testingService.getName(), "ExplicitDynamicRoutingHeaderTesting");
+    assertEquals("ExplicitDynamicRoutingHeaderTesting", testingService.getName());
 
     Map<String, Message> messageTypes = Parser.parseMessages(testingFileDescriptor);
     Map<String, ResourceName> resourceNames = Parser.parseResourceNames(testingFileDescriptor);
@@ -300,7 +301,7 @@ public GapicContext parseExplicitDynamicRoutingHeaderTesting() {
   public GapicContext parseApiVersionTesting() {
     FileDescriptor testingFileDescriptor = ApiVersionTestingOuterClass.getDescriptor();
     ServiceDescriptor testingService = testingFileDescriptor.getServices().get(0);
-    assertEquals(testingService.getName(), "EchoWithVersion");
+    assertEquals("EchoWithVersion", testingService.getName());
 
     Map<String, Message> messageTypes = Parser.parseMessages(testingFileDescriptor);
     Map<String, ResourceName> resourceNames = Parser.parseResourceNames(testingFileDescriptor);
@@ -333,7 +334,7 @@ public GapicContext parseAutoPopulateFieldTesting() {
         AutoPopulateFieldTestingOuterClass.getDescriptor();
     ServiceDescriptor autopopulationServiceDescriptor =
         autopopulationFileDescriptor.getServices().get(0);
-    assertEquals(autopopulationServiceDescriptor.getName(), "AutoPopulateFieldTesting");
+    assertEquals("AutoPopulateFieldTesting", autopopulationServiceDescriptor.getName());
 
     String serviceYamlFilename = "auto_populate_field_testing.yaml";
     Path serviceYamlPath = Paths.get(testFilesDirectory, serviceYamlFilename);
@@ -451,7 +452,7 @@ public GapicContext parsePubSubPublisher() {
   public GapicContext parseLogging() {
     FileDescriptor serviceFileDescriptor = LoggingProto.getDescriptor();
     ServiceDescriptor serviceDescriptor = serviceFileDescriptor.getServices().get(0);
-    assertEquals(serviceDescriptor.getName(), "LoggingServiceV2");
+    assertEquals("LoggingServiceV2", serviceDescriptor.getName());
 
     List<FileDescriptor> protoFiles =
         Arrays.asList(
@@ -506,7 +507,7 @@ public GapicContext parseLogging() {
   public GapicContext parseCallabeNameType() {
     FileDescriptor serviceFileDescriptor = CallableNameType.getDescriptor();
     ServiceDescriptor serviceDescriptor = serviceFileDescriptor.getServices().get(0);
-    assertEquals(serviceDescriptor.getName(), "CallableNameTypeService");
+    assertEquals("CallableNameTypeService", serviceDescriptor.getName());
 
     List<FileDescriptor> protoFiles = Collections.singletonList(serviceFileDescriptor);
 
@@ -539,6 +540,38 @@ public GapicContext parseCallabeNameType() {
         .build();
   }
 
+  public GapicContext parseBigqueryService() {
+    FileDescriptor bigqueryFileDescriptor = JobProto.getDescriptor();
+    ServiceDescriptor biqqueryServiceDescriptor = bigqueryFileDescriptor.getServices().get(0);
+    assertEquals("JobService", biqqueryServiceDescriptor.getName());
+
+    Map<String, Message> messageTypes = Parser.parseMessages(bigqueryFileDescriptor);
+    Map<String, ResourceName> resourceNames = Parser.parseResourceNames(bigqueryFileDescriptor);
+    Set<ResourceName> outputResourceNames = new HashSet<>();
+    List<Service> services =
+        Parser.parseService(
+            bigqueryFileDescriptor,
+            messageTypes,
+            resourceNames,
+            Optional.empty(),
+            outputResourceNames);
+
+    String jsonFilename = "bigquery_v2_service_config.json";
+    Path jsonPath = Paths.get(testFilesDirectory, jsonFilename);
+    Optional<GapicServiceConfig> configOpt = ServiceConfigParser.parse(jsonPath.toString());
+    assertTrue(configOpt.isPresent());
+    GapicServiceConfig config = configOpt.get();
+
+    return GapicContext.builder()
+        .setMessages(messageTypes)
+        .setResourceNames(resourceNames)
+        .setServices(services)
+        .setServiceConfig(config)
+        .setHelperResourceNames(outputResourceNames)
+        .setTransport(transport)
+        .build();
+  }
+
   public String getTestFilesDirectory() {
     return testFilesDirectory;
   }
diff --git a/gapic-generator-java/src/test/proto/bigquery_jobs.proto b/gapic-generator-java/src/test/proto/bigquery_jobs.proto
new file mode 100644
index 0000000000..9d6da3c8d9
--- /dev/null
+++ b/gapic-generator-java/src/test/proto/bigquery_jobs.proto
@@ -0,0 +1,112 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.cloud.bigquery.v2;
+
+import "google/api/annotations.proto";
+import "google/api/client.proto";
+import "google/api/field_behavior.proto";
+import "google/api/resource.proto";
+import "google/protobuf/empty.proto";
+import "google/protobuf/struct.proto";
+import "google/protobuf/wrappers.proto";
+
+option java_outer_classname = "JobProto";
+option java_package = "com.google.cloud.bigquery.v2";
+
+service JobService {
+  option (google.api.default_host) = "bigquery.googleapis.com";
+  option (google.api.oauth_scopes) =
+  "https://www.googleapis.com/auth/bigquery,"
+    "https://www.googleapis.com/auth/cloud-platform,"
+    "https://www.googleapis.com/auth/cloud-platform.read-only,"
+    "https://www.googleapis.com/auth/devstorage.full_control,"
+    "https://www.googleapis.com/auth/devstorage.read_only,"
+    "https://www.googleapis.com/auth/devstorage.read_write";
+
+  // Requests the deletion of the metadata of a job. This call returns when the
+  // job's metadata is deleted.
+  rpc DeleteJob(DeleteJobRequest) returns (google.protobuf.Empty) {
+    option (google.api.http) = {
+      delete: "/bigquery/v2/projects/{project_id=*}/jobs/{job_id=*}/delete"
+    };
+  }
+
+  // Lists all jobs that you started in the specified project. Job information
+  // is available for a six month period after creation. The job list is sorted
+  // in reverse chronological order, by job creation time. Requires the Can View
+  // project role, or the Is Owner project role if you set the allUsers
+  // property.
+  rpc ListJobs(ListJobsRequest) returns (JobList) {
+    option (google.api.http) = {
+      get: "/bigquery/v2/projects/{project_id=*}/jobs"
+    };
+  }
+}
+
+// Simplified BigQuery Jobs service ListJobsRequest for testing.
+message ListJobsRequest {
+  // Project ID of the jobs to list.
+  string project_id = 1;
+
+  // The maximum number of results to return in a single response page.
+  // Leverage the page tokens to iterate through the entire collection.
+  google.protobuf.Int32Value max_results = 3;
+
+  // Page token, returned by a previous call, to request the next page of
+  // results.
+  string page_token = 6;
+}
+
+// Describes the format of a jobs deletion request.
+message DeleteJobRequest {
+  // Required. Project ID of the job for which metadata is to be deleted.
+  string project_id = 1 [(google.api.field_behavior) = REQUIRED];
+
+  // Required. Job ID of the job for which metadata is to be deleted. If this is
+  // a parent job which has child jobs, the metadata from all child jobs will be
+  // deleted as well. Direct deletion of the metadata of child jobs is not
+  // allowed.
+  string job_id = 2 [(google.api.field_behavior) = REQUIRED];
+
+  // The geographic location of the job. Required.
+  //
+  // For more information, see how to
+  // [specify
+  // locations](https://cloud.google.com/bigquery/docs/locations#specify_locations).
+  string location = 3;
+}
+
+// Simplified ListFormatJob for testing.
+message ListFormatJob {
+  // Unique opaque ID of the job.
+  string id = 1;
+}
+
+// Simplified JobList response for testing.
+message JobList {
+  // A hash of this page of results.
+  string etag = 1;
+
+  // The resource type of the response.
+  string kind = 2;
+
+  // A token to request the next page of results.
+  string next_page_token = 3;
+
+  // List of jobs that were requested.
+  repeated ListFormatJob jobs = 4;
+}
\ No newline at end of file
diff --git a/gapic-generator-java/src/test/proto/echo.proto b/gapic-generator-java/src/test/proto/echo.proto
index 361e661459..28052e26c6 100644
--- a/gapic-generator-java/src/test/proto/echo.proto
+++ b/gapic-generator-java/src/test/proto/echo.proto
@@ -140,6 +140,16 @@ service Echo {
       body: "*"
     };
   }
+
+  // This is similar to the PagedExpand except that it uses
+  // max_results instead of page_size, as some legacy APIs still
+  // do. New APIs should NOT use this pattern.
+  rpc PagedExpandLegacy(PagedExpandLegacyRequest) returns (PagedExpandResponse) {
+    option (google.api.http) = {
+      post: "/v1beta1/echo:pagedExpandLegacy"
+      body: "*"
+    };
+  }
 }
 
 // A severity enum used to test enum capabilities in GAPIC surfaces
@@ -295,3 +305,19 @@ message BlockResponse {
   // here.
   string content = 1;
 }
+
+// The request for the PagedExpandLegacy method.  This is a pattern used by some legacy APIs. New
+// APIs should NOT use this pattern, but rather something like PagedExpandRequest which conforms to
+// aip.dev/158.
+message PagedExpandLegacyRequest {
+  // The string to expand.
+  string content = 1 [(google.api.field_behavior) = REQUIRED];
+
+  // The number of words to returned in each page.
+  // (-- aip.dev/not-precedent: This is a legacy, non-standard pattern that
+  //     violates aip.dev/158. Ordinarily, this should be page_size. --)
+  int32 max_results = 2;
+
+  // The position of the page to be returned.
+  string page_token = 3;
+}
diff --git a/gapic-generator-java/src/test/resources/bigquery_v2_service_config.json b/gapic-generator-java/src/test/resources/bigquery_v2_service_config.json
new file mode 100644
index 0000000000..8bc947af4e
--- /dev/null
+++ b/gapic-generator-java/src/test/resources/bigquery_v2_service_config.json
@@ -0,0 +1,10 @@
+{
+  "methodConfig": [
+    {
+      "name": [
+        {"service": "google.cloud.bigquery.v2.JobService"}
+      ],
+      "timeout": "5s"
+    }
+  ]
+}