Gradle protobuf task not picking up definitions from dependencies - gradle

Question

I have a situation where I have two Gradle subprojects that are basically dumb protobuf containers. One sub project needs to import the definitions from the other, but I can't seem to figure out how to get the protobuf Gradle plugin to work correctly (I'm fairly new to Gradle).
Here's an example.
Directory layout:
build.gradle
settings.gradle
gradle.properties
dependency/
|
- build.gradle
- src/main/proto/dependency.proto
main/
|
- build.gradle
- src/main/proto/main.proto
build.gradle (top level)
plugins {
id "com.google.protobuf" version "0.8.12"
id "java"
}
configure (allprojects) {
apply plugin: 'java'
apply plugin: 'com.google.protobuf'
}
settings.gradle
rootProject.name = 'sample'
include 'main'
include 'dependency'
gradle.properties
group=sample
version=0.1.0
dependency/build.gradle
protobuf {
protoc {
artifact = "com.google.protobuf:protoc:3.11.0"
}
}
dependencies {
compile 'com.google.protobuf:protobuf-java:3.11.4'
compile 'com.google.protobuf:protobuf-java-util:3.11.4'
}
dependency/src/main/proto/dependency.proto
syntax = "proto3";
package dependency;
option java_package = "dependency";
message DependencyRequest {
string foo = 1;
}
message DependencyResponse {
string bar = 1;
}
main/build.gradle
protobuf {
protoc {
artifact = "com.google.protobuf:protoc:3.11.0"
}
plugins {
grpc {
artifact = 'io.grpc:protoc-gen-grpc-java:1.27.2'
}
}
generateProtoTasks {
all()*.plugins {
grpc {}
}
}
}
dependencies {
compile 'com.google.protobuf:protobuf-java:3.11.4'
compile 'com.google.protobuf:protobuf-java-util:3.11.4'
protobuf project(':dependency')
}
main/src/main/proto/main.proto
syntax = "proto3";
package main;
option java_package = "main";
import "dependency/dependency.proto";
service MainService {
rpc CallDependency(DependencyRequest) returns (DependencyResponse) {}
}
When I try to build, I get this error:
$ ./gradlew :main:compileJava
> Task :main:generateProto FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':main:generateProto'.
> protoc: stdout: . stderr: dependency/dependency.proto: File not found.
main.proto:7:1: Import "dependency/dependency.proto" was not found or had errors.
main.proto:11:24: "DependencyRequest" is not defined.
main.proto:11:52: "DependencyResponse" is not defined.
I read documentation for the plugin and this answer, but I haven't been able to get it to work. Any idea why the protobuf task isn't picking up dependency.proto?

Answer 1

Apparently the protobuf files were getting set up correctly, but there was a mismatch in the package names that cause the main.proto to not be able to find dependency.proto. I was able to get this working by removing the package names in the protobuf definitions.
If anyone runs into this problem in the future, check your package names and imports to make sure they're correct.