Is it required to set `java_multiple_files = true` option in proto definition

When I try to build the project without setting java_multiple_files = true option in proto definition, I got Unresolved reference: error. It seems like the generated code referring to message type like <service-name>.<message-name> but there is no java class generated with the service-name.

When I set the java_multiple_files option to true. The code generates correctly and builds successfully.

[daneshk]

I think I found the issue. The problem comes when the proto file name is equal to the service name define inside the proto file. For example: Let say we have a proto file called hello_world.proto and service definition inside the proto file like below

syntax = "proto3";

package io.grpc.examples.helloworld;

// The greeting service definition.
service HelloWorld {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply);
}

// The request message containing the user's name.
message HelloRequest {
  string name = 1;
}

// The response message containing the greetings
message HelloReply {
  string message = 1;
}

Here proto filename is hello_world.proto and service name is HelloWorld.

When we generate the code, Generated java class is HelloWorldOuterClass.java. but generated Kotlin file is referring to the HelloWorld.HelloRequest for the message type. which causes the : Unresolved reference: HelloWorld

[lowasser]

Sounds like a valid bug.