Annotation Processor in IntelliJ and Gradle - intellij-idea

Question

tl;dr: I cannot configure IntelliJ to generate the java files in the same directory as gradle
I have a small project which uses the immutables annotation processor.
It works as expected in the gradle command line build, but I cannot get IntelliJ to output the generated files to the same directory.
The full project is available on GitLab
Gradle config:
I use the folowing gradle plugins:
gradle-idea plugin which handles the idea configuration
gradle-apt-plugin which provides the apt configuration and handles the compile-class path and idea config related to annotation processing (if also the idea plugin is applied)
relevant parts of the build-script (link to the full listing):
apply plugin: 'java'
apply plugin: "net.ltgt.apt"
apply plugin: 'idea'
dependencies {
def immutablesVersion = '2.3.9'
compileOnly "org.immutables:value:$immutablesVersion:annotations"
compileOnly "org.immutables:encode:$immutablesVersion"
apt "org.immutables:value:$immutablesVersion"
}
when I start ./gradlew build everything is as expected:
The source file DataEncoding.java is processed an the generated java-file DataEncodingEnabled.java ends up in
/build/generated/source/apt/main under the expected package com.tmtron.immutables.data
and the generated file is also compiled to a .class file
In IntelliJ I activate the annotation processing as suggested by the gradle-apt-plugin docs:
Then I execute ./gradlew clean to make sure, that the previous files are gone and then I click Build - Build Project in IntelliJ.
The annotation processor is executed, but the problem is that the generated java file ends up in the wrong location:
It is in: /build/generated/source/apt/main/build/generated/source/apt/main/com.tmtron.immutables.data
the bold part is redundant.
What am I doing wrong and how can I set it up correctly, so that IntelliJ and gradle generate the files in the same directory?
Notes:
I have of course already tried to just leave the "Production sources dir" in the IntelliJ annotation configuration empty, but his does not work: then it automatically uses "generated" and I also end up with a wrong path.
IntelliJ version 2016.3.4

Answer 1

Now https://github.com/tbroyer/gradle-apt-plugin states:
The goal of this plugin was to eventually no longer be needed, being superseded by built-in features. This is becoming a reality with Gradle 5.2 and IntelliJ IDEA 2019.1.
So:
dependencies {
compile("com.google.dagger:dagger:2.18")
annotationProcessor("com.google.dagger:dagger-compiler:2.18")
compileOnly("com.google.auto.factory:auto-factory:1.0-beta6")
annotationProcessor("com.google.auto.factory:auto-factory:1.0-beta6")
compileOnly("org.immutables:value-annotations:2.7.1")
annotationProcessor("org.immutables:value:2.7.1")
}
compileOnly is necessary if you use annotations, compile if you use classes, annotationProcessor introduced in Gradle 4.6.
To enable processing specific compile task:
compileJava {
options.annotationProcessorPath = configurations.annotationProcessor
}
To disable:
compileTestJava {
options.compilerArgs += '-proc:none'
}

Answer 2

UPDATE 2.2019
since Gradle 5.2 there is an easy way to do it - see gavenkoas answer
UPDATE 5.2018
The easiest way, I know of is to use the apt-idea plugin
Just activate the plugin in the build.gradle file:
plugins {
id 'java'
id 'net.ltgt.apt-idea' version "0.15"
}
and then add the annotation processors to the annotationProcessor configuration:
final DAGGER_VER = '2.16'
dependencies {
implementation "com.google.dagger:dagger:${DAGGER_VER}"
annotationProcessor"com.google.dagger:dagger-compiler:${DAGGER_VER}"
}
Test-project on GitHub: ex.dagger
(using IntelliJ 2018.1.4, Gradle 4.7)
ORIG ANSWER
There's a simple workaround using the parent-dir which works fine in IntelliJ 2016.3.4
Production sources directory: ../main
Test sources directory: ../test
Now gradle and IntelliJ will generate the code to the same directories.
Fixed in GitLab project V0.0.2
see also: apt-gradle-plugin issue#35

Answer 3

Hey there everyone I had the same issue and found a clean way of solving this issue.
I am using two libraries that require annotation processing (Lombok and MapStruct).
Also my IntelliJ is 2019.1 (update yours in case it's older) and Gradle 5.2.1.
First let's configure IntelliJ:
Disable Annotaion Processing in Settings, since we're going to delegate everything to Gradle:
Delegeate IDE actions to Gradle:
Last step is to configure your dependencies correctly in Gradle.
Dependencies section in Gradle:
Now you can execute the Build and Run from both command line and IDE.
Cheers!

Answer 4

2019.2.x
Disable annotation processor of intellij
add, build directory in your gradle build.gradle file
then run your gradle task to generate build file classes, example gradle compileJava
File -> project structure -> Modules -> Main Folder || remove exclude and add as source
And project should find all annotation and generated source file. Hope it helps.