IntelliJ IDEA doesn't recognize classes generated from proto files in a Gradle project

[Shpota]

Describe the bug
IntelliJ IDEA doesn't recognize classes generated from proto files in a Gradle project.

Expected behavior
Quarkus gRPC plugin should update IDEAs source sets so that it could see the generated classes automatically (for instance, like the protobuf-gradle-plugin does it).

Actual behavior
IntelliJ IDEA doesn't recognize classes generated from proto files in a Gradle project.

To Reproduce

Steps to reproduce the behavior:

1. Generate a Qurkus Gradle project with the 'io.quarkus:quarkus-grpc' dependency.
2. Add a valid proto file definfing a gRPC service into src/main/proto.
3. Build the project and check that the code has been generated to build/classes/java/quarkus-generated-sources/grpc.
4. Add a Java class with an import of a class from the generated sources.

Environment (please complete the following information):

• Output of uname -a or ver: 20.1.0 Darwin Kernel Version 20.1.0: Sat Oct 31 00:07:11 PDT 2020; root:xnu-7195.50.7~2/RELEASE_X86_64 x86_64
• Output of java -version:

openjdk 15.0.1 2020-10-20
OpenJDK Runtime Environment (build 15.0.1+9-18)
OpenJDK 64-Bit Server VM (build 15.0.1+9-18, mixed mode, sharing)

• GraalVM version (if different from Java): -
• Quarkus version or git rev: 1.10.3.Final
• Build tool (ie. output of mvnw --version or gradlew --version):

Gradle 6.5.1

Build time:   2020-06-30 06:32:47 UTC
Revision:     66bc713f7169626a7f0134bf452abde51550ea0a

Kotlin:       1.3.72
Groovy:       2.5.11
Ant:          Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM:          15.0.1 (Oracle Corporation 15.0.1+9-18)
OS:           Mac OS X 10.16 x86_64

Additional context
The work around is to manually specify an additional source set in Gradle:

sourceSets {
    main {
        java {
            srcDirs 'build/classes/java/quarkus-generated-sources/grpc'
        }
    }
}

But I tried many things and wasted a lot of time until I found how to fix it. It is important to have a ready-to-run project after project generation.

[ghost]

/cc @evanchooly, @glefloch, @quarkusio/devtools

[glefloch]

Is it a kotlin project? I have a fix that register the generated output to the gradle compile task.
I'm looking at removing the sub directory in the generated folder.

[Shpota]

@glefloch the issue exists in both Java and Kotlin projects.

[galiagacandia]

In intellij idea it is necessary to perform the following configuration

I hope this helps.

[michalszynkiewicz]

Isn't it enough to reload the project? That's how it works with maven projects, IntelliJ doesn't pick up new folders of generated sources until the project is reloaded

[geoand]

Closing as we never got feedback

[alanLJ]

In intellij idea it is necessary to perform the following configuration

I hope this helps.

That's so great.