Arrow: Annotation processor doesn't work with maven

[routis]

It seems that the annotation processor doesn't work in maven.

In particular, attempting to use the annotation processor, compilation fails with a null pointer exception thrown by arrow.instances.InstanceProcessor.onProcess(InstanceProcessor.kt:38), while trying to access the property generatedDir defined in its ancestor class me.eugeniomarletti.kotlin.processing.KotlinAbstractProcessor
error.txt
(See the details on the attached file)

I have created a simple project to demonstrate the problem.

I am not sure whether this is an actual bug or whether am I missing something in the maven configuration.
In any case probably it would be a good idea to add a section to the documentation of arrow detailing how to use annotation processing with maven

[Eternity-Yarr]

It appears that this was fixed in next releases of kotlin plugin. I've created a pull request with changes to your repository which compiles successfully,

[Eternity-Yarr]

https://github.com/routis/kaptdemo/pull/1

[routis]

Indeed, problem does not appear when using korlin plugin 1.2.41 and by adding the companion object.
@Eternity-Yarr Thanks for the solution

Perhaps, it would be nice to have in the "Quick Start" page of the Arrow documentation a section for maven.

[routis]

When using kotlin annotation processing plugin 1.3.0 and Arrow 0.8.0 I get the error:

[ERROR] Failed to execute goal org.jetbrains.kotlin:kotlin-maven-plugin:1.3.0:kapt (kapt) on project kapt-demo: Error while processing kapt options: Missing:
[ERROR] ----------
[ERROR] 1) com.github.aballano:MnemoniK:jar:1.0.0
[ERROR] 
[ERROR]   Try downloading the file manually from the project website.
[ERROR] 
[ERROR]   Then, install it using the command: 
[ERROR]       mvn install:install-file -DgroupId=com.github.aballano -DartifactId=MnemoniK -Dversion=1.0.0 -Dpackaging=jar -Dfile=/path/to/file
[ERROR] 
[ERROR]   Alternatively, if you host your own repository you can deploy the file there: 
[ERROR]       mvn deploy:deploy-file -DgroupId=com.github.aballano -DartifactId=MnemoniK -Dversion=1.0.0 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]
[ERROR] 
[ERROR]   Path to dependency: 
[ERROR]         1) org.jetbrains.kotlin:kotlin-annotation-processing-maven:jar:1.3.0
[ERROR]         2) io.arrow-kt:arrow-annotations-processor:jar:0.8.0
[ERROR]         3) com.github.aballano:MnemoniK:jar:1.0.0

At the same time, kotlin plugin 1.3.0 and 0.7.3 works as aspected.

[routis]

Updated the https://github.com/routis/kaptdemo that should reproduce this issue

[pakoito]

We changed the repositories needed for the project to include JitPack. Have you added it too?

[routis]

@pakoito Thanks

        <repository>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
            <id>jitpack</id>
            <url>https://jitpack.io</url>
        </repository>

[pakoito]

@routis close the ticket for now? :D

[TAGC]

I'm having this problem too, using Gradle rather than Maven and having followed the Gradle-specific instructions (there's no mention of JitPack in them). In particular:

$ gradle build

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':kaptKotlin'.
> Could not resolve all task dependencies for configuration ':kapt'.
   > Could not find com.github.aballano:MnemoniK:1.0.0.
     Searched in the following locations:
       - https://repo.maven.apache.org/maven2/com/github/aballano/MnemoniK/1.0.0/MnemoniK-1.0.0.pom
       - https://repo.maven.apache.org/maven2/com/github/aballano/MnemoniK/1.0.0/MnemoniK-1.0.0.jar
       - https://jcenter.bintray.com/com/github/aballano/MnemoniK/1.0.0/MnemoniK-1.0.0.pom
       - https://jcenter.bintray.com/com/github/aballano/MnemoniK/1.0.0/MnemoniK-1.0.0.jar
     Required by:
         project : > io.arrow-kt:arrow-annotations-processor:0.8.1

Edit: nevermind, my fault, I see it mentions maven { url 'https://jitpack.io' } in the top-level README.

[pakoito]

@TAGC is it fixed then?

[TAGC]

Yeah.

[Octogonapus]

@pakoito Should this be closed? They figured out the problem.

[pakoito]

Closing!