IntelliJ 不能识别 Scala 项目中的 protobuf 吗？

Question

I have a protobuf file src/main/protobuf/datamodel.proto on my scala project. I was generating the java file using the protoc compiler installed on my ubuntu machine.

cd src/
protoc --java_out=main/java main/protobuf/datamodel.proto

datamodel.proto:

syntax = "proto3";
package org.github.felipegutierrez.explore.akka.classic.remote.serialization;
option java_package = "org.github.felipegutierrez.explore.akka.classic.remote.serialization";
option java_outer_classname = "Datamodel";
message OnlineStoreUser {
  int32 userId = 1;
  string userName = 2;
  string userEmail = 4;
  string userPhone = 5;
}
message ProtobufVote {
  string ssn = 1;
  string candidate = 2;
}

So when I went to the src package org.github.felipegutierrez.explore.akka.classic.remote.serialization the corresponding file was there. Then I decided to use the sbt-protobuf plugin. Basically I added on the plugins.sbt file:

addSbtPlugin("com.github.gseitz" % "sbt-protobuf" % "0.6.5")

and on the build.sbt file:

enablePlugins(JavaAppPackaging, ProtobufPlugin)
sourceDirectories in ProtobufConfig += (protobufExternalIncludePath in ProtobufConfig).value
unmanagedResourceDirectories in Compile += (sourceDirectory in ProtobufConfig).value
libraryDependencies ++= Seq(
  ...
  "com.google.protobuf" % "protobuf-java"  % "3.14.0",
  "com.google.protobuf" % "protoc" % "3.14.0" pomOnly(),
)

When I run sbt protobuf:protobufGenerate on the root of the project, the corresponding java files are created. That is fine, I can compile, use the sbt docker:stage , sbt docker:publishLocal without problems.

ERROR : But when I click on my IntelliJ IDEA Build > Rebuild project I am getting the error:

Datamodel is already defined as class Datamodel
public final class Datamodel {

I suppose that it has something to do with IntelliJ + sbt + protobuf configuration. When I search for classes Datamodel inside IntelliJ I find only one under the target directory src_managed , which is where the sbt protobuf:protobufGenerate generated it.

Does anyone have an idea where I can configure it correctly and make IntelliJ recognize the class as only one in my project?

Answer 1

I was able to solve this problem by adding this line on the build.sbt :

javaSource in ProtobufConfig := ((sourceDirectory in Compile).value / "generated")

and removing the option java_package line from the datamodel.proto file:

syntax = "proto3";
package org.github.felipegutierrez.explore.akka.classic.remote.serialization;
option java_outer_classname = "Datamodel";
// commented this line because we are using "sbt-protobuf" plugin to generate java file on the specific location
// option java_package = "org.github.felipegutierrez.explore.akka.classic.remote.serialization";
message OnlineStoreUser {
  int32 userId = 1;
  string userName = 2;
  string userEmail = 4;
  string userPhone = 5;
}

now the command sbt protobuf:protobufGenerate generates one source file and IntelliJ see only one source file as well.