feat: Upgrade protobuf runtime and gen code to 4.33.

.cloudbuild/library_generation/library_generation.Dockerfile

@@ -37,7 +37,7 @@ RUN cp "/root/.m2/repository/com/google/api/gapic-generator-java/${DOCKER_GAPIC_
 FROM docker.io/library/python:3.13.2-slim@sha256:6b3223eb4d93718828223966ad316909c39813dee3ee9395204940500792b740 as final
 
 ARG OWLBOT_CLI_COMMITTISH=3a68a9c0de318784b3aefadcc502a6521b3f1bc5
-ARG PROTOC_VERSION=25.8
+ARG PROTOC_VERSION=33.0
 ARG GRPC_VERSION=1.76.1
 ENV HOME=/home
 ENV OS_ARCHITECTURE="linux-x86_64"

.cloudbuild/library_generation/library_generation_airlock.Dockerfile

@@ -38,7 +38,7 @@ RUN cp "/root/.m2/repository/com/google/api/gapic-generator-java/${DOCKER_GAPIC_
 FROM us-docker.pkg.dev/artifact-foundry-prod/docker-3p-trusted/python@sha256:afc139a0a640942491ec481ad8dda10f2c5b753f5c969393b12480155fe15a63 as final
 
 ARG OWLBOT_CLI_COMMITTISH=3a68a9c0de318784b3aefadcc502a6521b3f1bc5
-ARG PROTOC_VERSION=25.8
+ARG PROTOC_VERSION=33.0
 ARG GRPC_VERSION=1.76.1
 ENV HOME=/home
 ENV OS_ARCHITECTURE="linux-x86_64"

.github/release-please.yml

@@ -18,6 +18,11 @@ extraFiles:
     hermetic_build/library_generation/owlbot/templates/java_library/.kokoro/presubmit/graalvm-native-c.cfg
   - generation_config.yaml
 branches:
+  - branch: protobuf-4.x-rc
+    bumpMinorPreMajor: true
+    handleGHRelease: true
+    manifest: true
+    releaseType: java-yoshi
   - branch: 2.23.x
     releaseType: java-backport
     manifest: true

.github/workflows/ci.yaml

@@ -402,7 +402,7 @@ jobs:
         working-directory: java-showcase
         run: |
           mvn versions:set -B -ntp -DnewVersion=local
-          mvn clirr:check -B -ntp -Dclirr.skip=false -DcomparisonVersion=$SHOWCASE_CLIENT_VERSION
+          mvn clirr:check -B -ntp -DcomparisonVersion=$SHOWCASE_CLIENT_VERSION
 
   gapic-generator-java-bom:
     runs-on: ubuntu-22.04

gapic-generator-java-pom-parent/pom.xml

@@ -32,14 +32,16 @@
     <google.http-client.version>2.0.2</google.http-client.version>
     <gson.version>2.12.1</gson.version>
     <guava.version>33.5.0-jre</guava.version>
-    <protobuf.version>3.25.8</protobuf.version>
+    <protobuf.version>4.33.0</protobuf.version>
     <opentelemetry.version>1.52.0</opentelemetry.version>
     <errorprone.version>2.42.0</errorprone.version>
     <j2objc-annotations.version>3.1</j2objc-annotations.version>
     <threetenbp.version>1.7.0</threetenbp.version>
     <junit.version>5.11.4</junit.version>
     <mockito.version>4.11.0</mockito.version>
     <slf4j.version>2.0.16</slf4j.version>
+    <!--  skipping clirr check for protobuf 4.x upgrade -->
+    <clirr.skip>true</clirr.skip>
   </properties>
 
   <developers>

java-common-protos/proto-google-common-protos/src/main/java/com/google/api/Advice.java

@@ -14,9 +14,10 @@
  * limitations under the License.
  */
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
+// NO CHECKED-IN PROTOBUF GENCODE
 // source: google/api/config_change.proto
+// Protobuf Java Version: 4.33.0
 
-// Protobuf Java Version: 3.25.8
 package com.google.api;
 
 /**
@@ -29,33 +30,38 @@
  *
  * Protobuf type {@code google.api.Advice}
  */
-public final class Advice extends com.google.protobuf.GeneratedMessageV3
+@com.google.protobuf.Generated
+public final class Advice extends com.google.protobuf.GeneratedMessage
     implements
     // @@protoc_insertion_point(message_implements:google.api.Advice)
     AdviceOrBuilder {
   private static final long serialVersionUID = 0L;
 
+  static {
+    com.google.protobuf.RuntimeVersion.validateProtobufGencodeVersion(
+        com.google.protobuf.RuntimeVersion.RuntimeDomain.PUBLIC,
+        /* major= */ 4,
+        /* minor= */ 33,
+        /* patch= */ 0,
+        /* suffix= */ "",
+        "Advice");
+  }
+
   // Use Advice.newBuilder() to construct.
-  private Advice(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+  private Advice(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
     super(builder);
   }
 
   private Advice() {
     description_ = "";
   }
 
-  @java.lang.Override
-  @SuppressWarnings({"unused"})
-  protected java.lang.Object newInstance(UnusedPrivateParameter unused) {
-    return new Advice();
-  }
-
   public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
     return com.google.api.ConfigChangeProto.internal_static_google_api_Advice_descriptor;
   }
 
   @java.lang.Override
-  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+  protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
       internalGetFieldAccessorTable() {
     return com.google.api.ConfigChangeProto.internal_static_google_api_Advice_fieldAccessorTable
         .ensureFieldAccessorsInitialized(
@@ -131,8 +137,8 @@ public final boolean isInitialized() {
 
   @java.lang.Override
   public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
-    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
-      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, description_);
+    if (!com.google.protobuf.GeneratedMessage.isStringEmpty(description_)) {
+      com.google.protobuf.GeneratedMessage.writeString(output, 2, description_);
     }
     getUnknownFields().writeTo(output);
   }
@@ -143,8 +149,8 @@ public int getSerializedSize() {
     if (size != -1) return size;
 
     size = 0;
-    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
-      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, description_);
+    if (!com.google.protobuf.GeneratedMessage.isStringEmpty(description_)) {
+      size += com.google.protobuf.GeneratedMessage.computeStringSize(2, description_);
     }
     size += getUnknownFields().getSerializedSize();
     memoizedSize = size;
@@ -216,38 +222,38 @@ public static com.google.api.Advice parseFrom(
 
   public static com.google.api.Advice parseFrom(java.io.InputStream input)
       throws java.io.IOException {
-    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
   }
 
   public static com.google.api.Advice parseFrom(
       java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
       throws java.io.IOException {
-    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+    return com.google.protobuf.GeneratedMessage.parseWithIOException(
         PARSER, input, extensionRegistry);
   }
 
   public static com.google.api.Advice parseDelimitedFrom(java.io.InputStream input)
       throws java.io.IOException {
-    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
+    return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(PARSER, input);
   }
 
   public static com.google.api.Advice parseDelimitedFrom(
       java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
       throws java.io.IOException {
-    return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(
+    return com.google.protobuf.GeneratedMessage.parseDelimitedWithIOException(
         PARSER, input, extensionRegistry);
   }
 
   public static com.google.api.Advice parseFrom(com.google.protobuf.CodedInputStream input)
       throws java.io.IOException {
-    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
+    return com.google.protobuf.GeneratedMessage.parseWithIOException(PARSER, input);
   }
 
   public static com.google.api.Advice parseFrom(
       com.google.protobuf.CodedInputStream input,
       com.google.protobuf.ExtensionRegistryLite extensionRegistry)
       throws java.io.IOException {
-    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(
+    return com.google.protobuf.GeneratedMessage.parseWithIOException(
         PARSER, input, extensionRegistry);
   }
 
@@ -270,7 +276,7 @@ public Builder toBuilder() {
   }
 
   @java.lang.Override
-  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
     Builder builder = new Builder(parent);
     return builder;
   }
@@ -285,7 +291,7 @@ protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.Build
    *
    * Protobuf type {@code google.api.Advice}
    */
-  public static final class Builder extends com.google.protobuf.GeneratedMessageV3.Builder<Builder>
+  public static final class Builder extends com.google.protobuf.GeneratedMessage.Builder<Builder>
       implements
       // @@protoc_insertion_point(builder_implements:google.api.Advice)
       com.google.api.AdviceOrBuilder {
@@ -294,7 +300,7 @@ public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
     }
 
     @java.lang.Override
-    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
         internalGetFieldAccessorTable() {
       return com.google.api.ConfigChangeProto.internal_static_google_api_Advice_fieldAccessorTable
           .ensureFieldAccessorsInitialized(
@@ -304,7 +310,7 @@ public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
     // Construct using com.google.api.Advice.newBuilder()
     private Builder() {}
 
-    private Builder(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    private Builder(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
       super(parent);
     }
 
@@ -352,39 +358,6 @@ private void buildPartial0(com.google.api.Advice result) {
       }
     }
 
-    @java.lang.Override
-    public Builder clone() {
-      return super.clone();
-    }
-
-    @java.lang.Override
-    public Builder setField(
-        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
-      return super.setField(field, value);
-    }
-
-    @java.lang.Override
-    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
-      return super.clearField(field);
-    }
-
-    @java.lang.Override
-    public Builder clearOneof(com.google.protobuf.Descriptors.OneofDescriptor oneof) {
-      return super.clearOneof(oneof);
-    }
-
-    @java.lang.Override
-    public Builder setRepeatedField(
-        com.google.protobuf.Descriptors.FieldDescriptor field, int index, java.lang.Object value) {
-      return super.setRepeatedField(field, index, value);
-    }
-
-    @java.lang.Override
-    public Builder addRepeatedField(
-        com.google.protobuf.Descriptors.FieldDescriptor field, java.lang.Object value) {
-      return super.addRepeatedField(field, value);
-    }
-
     @java.lang.Override
     public Builder mergeFrom(com.google.protobuf.Message other) {
       if (other instanceof com.google.api.Advice) {
@@ -569,17 +542,6 @@ public Builder setDescriptionBytes(com.google.protobuf.ByteString value) {
       return this;
     }
 
-    @java.lang.Override
-    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
-      return super.setUnknownFields(unknownFields);
-    }
-
-    @java.lang.Override
-    public final Builder mergeUnknownFields(
-        final com.google.protobuf.UnknownFieldSet unknownFields) {
-      return super.mergeUnknownFields(unknownFields);
-    }
-
     // @@protoc_insertion_point(builder_scope:google.api.Advice)
   }
 

java-common-protos/proto-google-common-protos/src/main/java/com/google/api/AdviceOrBuilder.java

@@ -14,11 +14,13 @@
  * limitations under the License.
  */
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
+// NO CHECKED-IN PROTOBUF GENCODE
 // source: google/api/config_change.proto
+// Protobuf Java Version: 4.33.0
 
-// Protobuf Java Version: 3.25.8
 package com.google.api;
 
+@com.google.protobuf.Generated
 public interface AdviceOrBuilder
     extends
     // @@protoc_insertion_point(interface_extends:google.api.Advice)

java-common-protos/proto-google-common-protos/src/main/java/com/google/api/AnnotationsProto.java

@@ -14,14 +14,26 @@
  * limitations under the License.
  */
 // Generated by the protocol buffer compiler.  DO NOT EDIT!
+// NO CHECKED-IN PROTOBUF GENCODE
 // source: google/api/annotations.proto
+// Protobuf Java Version: 4.33.0
 
-// Protobuf Java Version: 3.25.8
 package com.google.api;
 
-public final class AnnotationsProto {
+@com.google.protobuf.Generated
+public final class AnnotationsProto extends com.google.protobuf.GeneratedFile {
   private AnnotationsProto() {}
 
+  static {
+    com.google.protobuf.RuntimeVersion.validateProtobufGencodeVersion(
+        com.google.protobuf.RuntimeVersion.RuntimeDomain.PUBLIC,
+        /* major= */ 4,
+        /* minor= */ 33,
+        /* patch= */ 0,
+        /* suffix= */ "",
+        "AnnotationsProto");
+  }
+
   public static void registerAllExtensions(com.google.protobuf.ExtensionRegistryLite registry) {
     registry.add(com.google.api.AnnotationsProto.http);
   }
@@ -71,7 +83,8 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
               com.google.api.HttpProto.getDescriptor(),
               com.google.protobuf.DescriptorProtos.getDescriptor(),
             });
-    http.internalInit(descriptor.getExtensions().get(0));
+    http.internalInit(descriptor.getExtension(0));
+    descriptor.resolveAllFeaturesImmutable();
     com.google.api.HttpProto.getDescriptor();
     com.google.protobuf.DescriptorProtos.getDescriptor();
   }