Hello! How are you guys setting up kotlin + dagge...

# dagger

[cvmocanu]

Hello!

How are you guys setting up kotlin + dagger2?

Is there a way to make IntelliJ automatically run kapt as part of building (Ctrl+F9)?
I am trying to use Dagger 2 in a Kotlin / maven project

Here is what I tried:
(1) setup add dagger-compiler as a dependency. "Settings > Build, Execution, Deployment > Compiler > Annotation Processors" for my maven module has "Enable annotation processing" checked and "Obtain processors from project classpath"
So I quickly realized that option (1) obviously won't work if I write my dagger components and modules in kotlin code.

So I tried
(2) setup the kotlin maven plugin to run kapt with dagger2:

<plugin>
                <artifactId>kotlin-maven-plugin</artifactId>
                <groupId>org.jetbrains.kotlin</groupId>

                <executions>
                    <execution>
                        <id>kapt</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>kapt</goal>
                        </goals>
                        <configuration>
                            <sourceDirs>
                                <sourceDir>src/main/kotlin</sourceDir>
                                <sourceDir>src/main/java</sourceDir>
                            </sourceDirs>
                            <annotationProcessorPaths>
                                <!-- Specify your annotation processors here. -->
                                <annotationProcessorPath>
                                    <groupId>com.google.dagger</groupId>
                                    <artifactId>dagger-compiler</artifactId>
                                    <version>2.16</version>
                                </annotationProcessorPath>
                            </annotationProcessorPaths>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

This works from maven, but IntelliJ is completely clueless. By this, I mean that no additional files are generated in my target directory when I press Ctrl+F9 (or choose to rebuild the module). There is only a "classes" directory there.

(3) as a quick test I also tried a small gradle project. The only way I could get it to work was to delegate compile to gradle (Settings > Build, Execution, Deployment > Build Tools > Gradle > Runner -> enable: "Delegate build/run actions to gradle")
But this means it's gradle that compiles & runs kapt, not IntelliJ.

So now I'm out of ideas.

Is there a way to make IntelliJ automatically run kapt as part of building (Ctrl+F9)?
Or is basically dagger 2 useless on a maven + Kotlin project? If I have to do "mvn clean package" every time I change a class, that makes dagger 2 useless for me (and for anyone that cares about development productivity).

Also, if you use gradle + dagger 2 + kotlin and you delegate build/run actions to gradle, doesn't this make the whole compilation unbearably slow? Especially given the fact that apparently kapt cannot run in gradle incremental mode (https://youtrack.jetbrains.com/issue/KT-11978).

[carwashi]

The bottom of this section -> https://kotlinlang.org/docs/reference/kapt.html#using-in-maven states the following:
Please note that kapt is still not supported for IntelliJ IDEA's own build system. Launch the build from the "Maven Projects" toolbar whenever you want to re-run the annotation processing.

[carwashi]

I’ve gotten around this by doing maven builds when changing things related to dagger and using the same target dir in intellij

[cvmocanu]

@carwashi: thanks a lot. I skimmed that page, but I missed that warning.

Your workaround wouldn't work for me since I have around 100 modules and waiting multiple minutes after maven every time I change some dependencies is not acceptable.

Again, thanks a lot.