google protobuf编译器没有为服务标签生成类？

service MyService {
  rpc MyMethod(MyRequest) returns (MyResponse);
}

protoc --java_out=generated my_service.proto

public class MyServiceImpl extends MyServiceGrpc.MyServiceImplBase {
  @Override
  public void myMethod(MyRequest request, StreamObserver<MyResponse> responseObserver) {
    // 处理请求并生成响应
    MyResponse response = MyResponse.newBuilder().setMessage("Hello, " + request.getName()).build();
    // 将响应发送给客户端
    responseObserver.onNext(response);
    responseObserver.onCompleted();
  }
}

public class MyServer {
  public static void main(String[] args) throws IOException, InterruptedException {
    // 创建RPC服务
    Server server = ServerBuilder.forPort(50051).addService(new MyServiceImpl()).build();
    // 启动RPC服务
    server.start();
    // 阻塞主线程，保持服务持续运行
    server.awaitTermination();
  }
}