Ubuntu – gRPC Kotlin Codegen Plugin for Protobuf Compiler it generates only one class

I’m trying to generate classes for my grpc client in kotlin but it only generates one class I’m following this tutorial link I already have protoc installed on my ubuntu I will post how is the protoc-gen-grpc-kotlin.sh and my proto. If anyone knows where I’m going wrong, I’d appreciate it.

my protoc-gen-grpc-kotlin.sh:

#!/usr/bin/bash

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
java -jar $DIR/protoc-gen-grpc-kotlin-1.3.0-jdk8.jar $@

I am using protoc-gen-grpc-kotlin-1.3.0-jdk8.jar plugin

My java version is 17 but I tested it with version 8 and it didn’t work either

My HelloService.proto:

syntax = "proto3";
package com.example.grpc;
option java_multiple_files = true;
//import "google/api/annotations.proto";

message HelloRequest {
    string firstName = 1;
    string lastName = 2;
}

message HelloResponse {
    string greeting =1;
}

service HelloService {
    rpc hello (HelloRequest) returns (HelloResponse) {}
//    rpc hello(HelloRequest) returns (HelloResponse){
//        option (google.api.http) = {
//            post: "/demo/item"
//            body: "*"
//        };
//    }
}

protoc command:

protoc --kotlin_out=. --java_out=. --plugin=protoc-gen-kotlin=protoc-gen-grpc-kotlin.sh --proto_path=. HelloService.proto

Java classes are normally generated but Create only one kotlin service

Thanks!