Is there any way of making IntelliJ IDEA recognizing Dagger 2 generated classes in a Java project?

Question

Context

I have started a personal project in java with Gradle as the build system and I want to use Dagger 2 as a DI. The main reason of doing that is to get used to that library and be able to use it easily in bigger projects.

What have I tried

I've managed to make the Google sample runs on IntelliJ IDEA

Problem

IntelliJ IDEA keeps telling me that it cannot resolve the generated class (in this case DaggerCoffeeApp_Coffee ). It's a bit annoying not to know if the written code is correct (specially when you are learning to use Dagger 2).

All java classes are the same as the Google sample . Here is my build.gradle file:

apply plugin: 'java'

repositories {
    mavenCentral()
}

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'

    compile 'com.google.dagger:dagger:2.0.1'
    compile 'com.google.dagger:dagger-compiler:2.0.1'
}

Question

Is there any way to make IntelliJ IDEA recognize DaggerCoffeeApp_Coffee as a generated class (and so make it possible to go to its implementation by `ctrl + left click)?

Answer 1

Finally I made it!

I had to add the apt and the idea plugin so right now my build.gradle file look like this:

buildscript {
    repositories {
        maven {
            url "https://plugins.gradle.org/m2/"
        }
    }
    dependencies {
        classpath "net.ltgt.gradle:gradle-apt-plugin:0.4"
    }
}

apply plugin: "net.ltgt.apt"
apply plugin: 'java'
apply plugin: 'idea'

repositories {
    mavenCentral()
}

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'

    compile 'com.google.dagger:dagger:2.0.1'
    apt 'com.google.dagger:dagger-compiler:2.0.1'
}

Answer 2

Simplest way I found:

1. Add idea plugin and add Dagger2 dependency like below:

    plugins { id "net.ltgt.apt" version "0.10" } apply plugin: 'java' apply plugin: 'idea' sourceCompatibility = 1.8 repositories { mavenCentral() } dependencies { testCompile group: 'junit', name: 'junit', version: '4.12' compile 'com.google.dagger:dagger:2.11' apt 'com.google.dagger:dagger-compiler:2.11' } 

2. Turn on Annotation Processing for IntelliJ: Go to Settings and search for Annotation Processors , check Enable annotation processing like below image:

Answer 3

you must manually enable the annotation processing in IntelliJ.

From: Settings --> Build, Execution, Deployment --> Compiler --> Annotation Processors --> Enable annotation processing and Obtain processors from project classpath

then rebuild the project and you will find the generated classes in the project.

Please note that I have used this solution in a (java) android project.

Answer 4

I'm using version 2017.3.3 of IntelliJ IDEA, version 0.14 of the net.ltgt.apt plugin and version 2.14.1 of Dagger and as well as applying the idea plugin in the build.gradle file (as in Pelocho's answer ) I found I also had to tell IntelliJ where it can find the sources generated by Dagger, as follows:

apply plugin: 'idea'
idea {
    module {
        sourceDirs += file("$buildDir/generated/source/apt/main")
        testSourceDirs += file("$buildDir/generated/source/apt/test")
    }
}

Answer 5

Here's the solution that worked for me:

File -> Project Structure -> (select your project under list of modules) -> Open 'Dependencies' tab

Then, click on green '+' sign, select 'JARs or directory' and select 'build/classes/main' folder.

Another solution would be to link folder with build class files using 'dependencies' block inside build.gradle:

https://stackoverflow.com/a/22769015/5761849

Answer 6

This is what I had to do in order to get Idea to work with Dagger2 and gradle.

1. Turn on annotation processing as shown in the answers above.

2. Add the following to the build.gradle file in order for Idea to see the generated classes as sources.

    sourceDirs += file("$projectDir/out/production/classes/generated/") 

Here's the full listing of my build.gradle

plugins {
    id 'java'
    id 'idea'
    id "net.ltgt.apt" version "0.10"
}

idea {
    module {
        sourceDirs += file("$projectDir/out/production/classes/generated/")
    }
}

repositories {
    mavenCentral()
}

dependencies {
    compile 'com.google.dagger:dagger:2.16'
    apt 'com.google.dagger:dagger-compiler:2.16'
}

sourceCompatibility = 1.8

Also, I had to add the following gradle task (to my build.gradle file) to clear out my out directory. When I moved some files around and Dagger2 regenerated the source files, the out directory wasn't being cleared out :(. I also included this task in my run configuration, so that it gets triggered before I rebuild my project.

task clearOutFolder(type: Delete) {
    delete 'out'
}

Answer 7

Using IntelliJ IDEA 2019.1 and Gradle 5.4.1, this seems to be enough:

plugins {
    id 'java'
}

version '1.0-SNAPSHOT'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    testImplementation group: 'junit', name: 'junit', version: '4.12'

    implementation 'com.google.dagger:dagger:2.23.1'
    annotationProcessor 'com.google.dagger:dagger-compiler:2.23.1'
}

I don't know the minimal versions for which this solution works, though.

Answer 8

I had a similar problem, I could not find out the cause for a long time.

Just launched and the result surprised me. Intellij Idea 2018.3.6 - build.gradle :

plugins {
    id "java"
}
sourceCompatibility = 1.8
repositories {
    mavenCentral()
}
dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.12'

    compile 'com.google.dagger:dagger:2.11'
    apt 'com.google.dagger:dagger-compiler:2.11'
}

Answer 9

The following worked for me on IntelliJ 2021.3.3 (UE)

plugins {
    id 'java'
    id 'idea'
    id("com.github.johnrengelman.shadow") version "7.1.2"
}

idea {
    module {
        sourceDirs += file("$projectDir/build/generated/sources/annotationProcessor/java/main")
        testSourceDirs += file("$projectDir/build/generated/sources/annotationProcessor/java/test")
    }
}

group 'com.codigomorsa'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}

dependencies {
    annotationProcessor 'com.google.dagger:dagger-compiler:2.44'
    implementation 'com.google.code.gson:gson:2.9.1'
    implementation 'com.google.dagger:dagger:2.44'
    testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.44'
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.9.0'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.9.0'
}

test {
    useJUnitPlatform()
}