diff --git a/BUILD.bazel b/BUILD.bazel
index 7d7e512dad..e8e17887a3 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -79,6 +79,7 @@ proto_library(
         "@com_google_protobuf//:empty_proto",
         "@com_google_protobuf//:field_mask_proto",
         "@com_google_protobuf//:timestamp_proto",
+        "@com_google_protobuf//:struct_proto",
     ],
 )
 java_proto_library(
diff --git a/src/main/java/com/google/api/generator/engine/ast/TypeNode.java b/src/main/java/com/google/api/generator/engine/ast/TypeNode.java
index 31cd5141c8..1814be11aa 100644
--- a/src/main/java/com/google/api/generator/engine/ast/TypeNode.java
+++ b/src/main/java/com/google/api/generator/engine/ast/TypeNode.java
@@ -70,6 +70,9 @@ public enum TypeKind {
 
   public static final TypeNode BYTESTRING =
       TypeNode.withReference(ConcreteReference.withClazz(ByteString.class));
+  public static final TypeNode VALUE =
+      withReference(
+          VaporReference.builder().setName("Value").setPakkage("com.google.protobuf").build());
 
   private static final Map<TypeNode, TypeNode> BOXED_TYPE_MAP = createBoxedTypeMap();
 
diff --git a/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceClientTestClassComposer.java b/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceClientTestClassComposer.java
index 11786d29ab..896607982c 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceClientTestClassComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceClientTestClassComposer.java
@@ -230,6 +230,7 @@ private List<MethodDefinition> createTestMethods(
     List<MethodDefinition> javaMethods = new ArrayList<>();
     for (Method method : service.methods()) {
       if (!isSupportedMethod(method)) {
+        javaMethods.add(createUnsupportedTestMethod(method));
         continue;
       }
       Service matchingService = service;
@@ -760,6 +761,31 @@ protected abstract List<Statement> createStreamingRpcExceptionTestStatements(
       Map<String, ResourceName> resourceNames,
       Map<String, Message> messageTypes);
 
+  protected MethodDefinition createUnsupportedTestMethod(Method method) {
+    String javaMethodName = JavaStyle.toLowerCamelCase(method.name());
+    String exceptionTestMethodName = String.format("%sUnsupportedMethodTest", javaMethodName);
+
+    List<Statement> methodBody =
+        Collections.singletonList(
+            CommentStatement.withComment(
+                LineComment.withComment(
+                    "The "
+                        + javaMethodName
+                        + "() method is not supported in "
+                        + String.join("+", getTransportContext().transportNames())
+                        + " transport.\n"
+                        + "This empty test is generated for technical reasons.")));
+
+    return MethodDefinition.builder()
+        .setAnnotations(Arrays.asList(TEST_ANNOTATION))
+        .setScope(ScopeNode.PUBLIC)
+        .setReturnType(TypeNode.VOID)
+        .setName(exceptionTestMethodName)
+        .setThrowsExceptions(Arrays.asList(TypeNode.withExceptionClazz(Exception.class)))
+        .setBody(methodBody)
+        .build();
+  }
+
   protected List<Statement> createRpcExceptionTestStatements(
       Method method,
       List<MethodArgument> methodSignature,
diff --git a/src/main/java/com/google/api/generator/gapic/composer/defaultvalue/DefaultValueComposer.java b/src/main/java/com/google/api/generator/gapic/composer/defaultvalue/DefaultValueComposer.java
index bf1c26dae4..54fc1dad57 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/defaultvalue/DefaultValueComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/defaultvalue/DefaultValueComposer.java
@@ -168,6 +168,20 @@ public static Expr createValue(
               .setStaticReferenceType(field.type())
               .setMethodName("newBuilder")
               .build();
+      if (field.type().equals(TypeNode.VALUE)) {
+        newBuilderExpr =
+            MethodInvocationExpr.builder()
+                .setExprReferenceExpr(newBuilderExpr)
+                .setMethodName("setBoolValue")
+                .setArguments(
+                    ValueExpr.withValue(
+                        PrimitiveValue.builder()
+                            .setType(TypeNode.BOOLEAN)
+                            .setValue("true")
+                            .build()))
+                .build();
+      }
+
       return MethodInvocationExpr.builder()
           .setExprReferenceExpr(newBuilderExpr)
           .setMethodName("build")
diff --git a/src/test/java/com/google/api/generator/gapic/composer/defaultvalue/DefaultValueComposerTest.java b/src/test/java/com/google/api/generator/gapic/composer/defaultvalue/DefaultValueComposerTest.java
index 9f84b34ad0..298d6e27d8 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/defaultvalue/DefaultValueComposerTest.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/defaultvalue/DefaultValueComposerTest.java
@@ -29,6 +29,7 @@
 import com.google.api.generator.testutils.LineFormatter;
 import com.google.protobuf.ByteString;
 import com.google.protobuf.Descriptors.FileDescriptor;
+import com.google.protobuf.StructProto;
 import com.google.showcase.v1beta1.EchoOuterClass;
 import com.google.testgapic.v1beta1.LockerProto;
 import java.util.Arrays;
@@ -410,6 +411,28 @@ public void createSimpleMessage_containsMessagesEnumsAndResourceName() {
         writerVisitor.write());
   }
 
+  @Test
+  public void createSimpleMessage_valueField() {
+    FileDescriptor echoFileDescriptor =
+        com.google.showcase.grpcrest.v1beta1.EchoGrpcrest.getDescriptor();
+    Map<String, Message> messageTypes = Parser.parseMessages(echoFileDescriptor);
+    messageTypes.putAll(Parser.parseMessages(StructProto.getDescriptor()));
+    Map<String, ResourceName> typeStringsToResourceNames =
+        Parser.parseResourceNames(echoFileDescriptor);
+    Message message = messageTypes.get("com.google.showcase.grpcrest.v1beta1.EchoResponse");
+    Expr expr =
+        DefaultValueComposer.createSimpleMessageBuilderValue(
+            message, typeStringsToResourceNames, messageTypes, null);
+    expr.accept(writerVisitor);
+    assertEquals(
+        "EchoResponse.newBuilder()"
+            + ".setContent(\"content951530617\")"
+            + ".setSeverity(Severity.forNumber(0))"
+            + ".setValueField(Value.newBuilder().setBoolValue(true).build())"
+            + ".build()",
+        writerVisitor.write());
+  }
+
   @Test
   public void createSimpleMessage_containsRepeatedField() {
     FileDescriptor echoFileDescriptor = EchoOuterClass.getDescriptor();
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpcrest/GrpcRestTestProtoLoader.java b/src/test/java/com/google/api/generator/gapic/composer/grpcrest/GrpcRestTestProtoLoader.java
index 375204be59..05c0241327 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpcrest/GrpcRestTestProtoLoader.java
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpcrest/GrpcRestTestProtoLoader.java
@@ -29,6 +29,7 @@
 import com.google.longrunning.OperationsProto;
 import com.google.protobuf.Descriptors.FileDescriptor;
 import com.google.protobuf.Descriptors.ServiceDescriptor;
+import com.google.protobuf.StructProto;
 import com.google.showcase.grpcrest.v1beta1.EchoGrpcrest;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -57,9 +58,9 @@ public GapicContext parseShowcaseEcho() {
     assertEquals("Echo", echoServiceDescriptor.getName());
 
     Map<String, Message> messageTypes = Parser.parseMessages(echoFileDescriptor);
-    Map<String, Message> operationMessageTypes =
-        Parser.parseMessages(OperationsProto.getDescriptor());
-    messageTypes.putAll(operationMessageTypes);
+    messageTypes.putAll(Parser.parseMessages(OperationsProto.getDescriptor()));
+    messageTypes.putAll(Parser.parseMessages(StructProto.getDescriptor()));
+
     Map<String, ResourceName> resourceNames = Parser.parseResourceNames(echoFileDescriptor);
     Set<ResourceName> outputResourceNames = new HashSet<>();
     List<Service> services =
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpcrest/goldens/EchoClientHttpJsonTest.golden b/src/test/java/com/google/api/generator/gapic/composer/grpcrest/goldens/EchoClientHttpJsonTest.golden
index b3a5f9c63d..e3a030ccd9 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpcrest/goldens/EchoClientHttpJsonTest.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpcrest/goldens/EchoClientHttpJsonTest.golden
@@ -18,6 +18,7 @@ import com.google.longrunning.Operation;
 import com.google.protobuf.Any;
 import com.google.protobuf.Duration;
 import com.google.protobuf.Timestamp;
+import com.google.protobuf.Value;
 import com.google.rpc.Status;
 import com.google.showcase.grpcrest.v1beta1.stub.HttpJsonEchoStub;
 import java.io.IOException;
@@ -72,6 +73,7 @@ public class EchoClientHttpJsonTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockService.addResponse(expectedResponse);
 
@@ -121,6 +123,7 @@ public class EchoClientHttpJsonTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockService.addResponse(expectedResponse);
 
@@ -166,6 +169,7 @@ public class EchoClientHttpJsonTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockService.addResponse(expectedResponse);
 
@@ -211,6 +215,7 @@ public class EchoClientHttpJsonTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockService.addResponse(expectedResponse);
 
@@ -256,6 +261,7 @@ public class EchoClientHttpJsonTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockService.addResponse(expectedResponse);
 
@@ -301,6 +307,7 @@ public class EchoClientHttpJsonTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockService.addResponse(expectedResponse);
 
@@ -346,6 +353,7 @@ public class EchoClientHttpJsonTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockService.addResponse(expectedResponse);
 
@@ -391,6 +399,7 @@ public class EchoClientHttpJsonTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockService.addResponse(expectedResponse);
 
@@ -805,4 +814,16 @@ public class EchoClientHttpJsonTest {
       // Expected exception.
     }
   }
+
+  @Test
+  public void chatUnsupportedMethodTest() throws Exception {
+    // The chat() method is not supported in REST transport.
+    // This empty test is generated for technical reasons.
+  }
+
+  @Test
+  public void noBindingUnsupportedMethodTest() throws Exception {
+    // The noBinding() method is not supported in REST transport.
+    // This empty test is generated for technical reasons.
+  }
 }
diff --git a/src/test/java/com/google/api/generator/gapic/composer/grpcrest/goldens/EchoClientTest.golden b/src/test/java/com/google/api/generator/gapic/composer/grpcrest/goldens/EchoClientTest.golden
index 014add9c3a..aed3486918 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/grpcrest/goldens/EchoClientTest.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/grpcrest/goldens/EchoClientTest.golden
@@ -22,6 +22,7 @@ import com.google.protobuf.AbstractMessage;
 import com.google.protobuf.Any;
 import com.google.protobuf.Duration;
 import com.google.protobuf.Timestamp;
+import com.google.protobuf.Value;
 import com.google.rpc.Status;
 import io.grpc.StatusRuntimeException;
 import java.io.IOException;
@@ -82,6 +83,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
 
@@ -124,6 +126,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
 
@@ -163,6 +166,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
 
@@ -202,6 +206,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
 
@@ -241,6 +246,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
 
@@ -280,6 +286,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
 
@@ -319,6 +326,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
 
@@ -358,6 +366,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
 
@@ -400,6 +409,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
     ExpandRequest request =
@@ -781,6 +791,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
     EchoRequest request =
@@ -839,6 +850,7 @@ public class EchoClientTest {
         EchoResponse.newBuilder()
             .setContent("content951530617")
             .setSeverity(Severity.forNumber(0))
+            .setValueField(Value.newBuilder().setBoolValue(true).build())
             .build();
     mockEcho.addResponse(expectedResponse);
 
diff --git a/src/test/proto/echo_grpcrest.proto b/src/test/proto/echo_grpcrest.proto
index 4b56bca9e3..61efb8fd65 100644
--- a/src/test/proto/echo_grpcrest.proto
+++ b/src/test/proto/echo_grpcrest.proto
@@ -20,6 +20,7 @@ import "google/api/field_behavior.proto";
 import "google/api/resource.proto";
 import "google/longrunning/operations.proto";
 import "google/protobuf/duration.proto";
+import "google/protobuf/struct.proto";
 import "google/protobuf/timestamp.proto";
 import "google/rpc/status.proto";
 
@@ -210,6 +211,9 @@ message EchoResponse {
 
   // The severity specified in the request.
   Severity severity = 2;
+
+  // Value field to test special case in Value type serialization.
+  google.protobuf.Value value_field = 3;
 }
 
 // Tests name collisions with java.lang.Object.