Build fails with multi-module maven project about coveralls-maven-plugin

[jewzaam]

Did a simple hack in a fork but won't do a pull request. It skips ANY failure to create a source loader, which is too much. It should only skip if no source could be found, such as with a module where packaging=pom.

Note that coveralls:cobertura has no problem with multi-module projects and my final "ah ha" was when looking for some project in the wild that had similar setup and used coveralls.. they all ran cobertura.

[trautonen]

JaCoCo does not support multi-module projects properly and currently my plugin expects that you are running a single module build with JaCoCo. There's some discussion about multi-module support for JaCoCo here.

Multi-module support is about to change in version 3 of my plugin. I will add simple aggregation support that merges multiple reports to a single one. This does not resolve the issue with JaCoCo that it does not count coverage from a module that is tested from another module within same reactor, but still better than nothing.

Cobertura supports multi-module aggregation, but does not work with Java 8. So at the moment we don't have a real solution at all for multi-module Java 8 projects.

[metteo]

I have the same problem: https://travis-ci.org/metteo/jts/jobs/33930195

[ERROR] Failed to execute goal org.eluder.coveralls:coveralls-maven-plugin:2.2.0:cobertura (default-cli) on project jts: I/O operation failed: /home/travis/build/metteo/jts/jts/target/coveralls.json (No such file or directory) -> [Help 1]

This fails on parent pom project. What is interesting, I was able to run the plugin manually on my computer and it worked (If you look on coveralls page there are 2 builds). Somehow it fails on travis. I had similar issue with sourceEncoding. I had it in plugin configuration but it was complaining on travis until I set it as project.build.sourceEncoding.

[trautonen]

Maybe there's difference with the maven versions at Travis and in your local environment. Anyway, the plugin is not designed to work properly with multi module projects that run without aggregation. I see you use cobertura without aggregation, and that most likely causes the failure.

If you can add Sonatype's repository

<repository>
<id>sonatype-nexus-snapshots</id>
<name>Sonatype Nexus Snapshots</name>
<url>
https://oss.sonatype.org/content/repositories/snapshots
</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>

And change the plugin version to 3.0.0-multi-module-SNAPSHOT and replace the plugin's goal with org.eluder.coveralls:coveralls-maven-plugin:report and see how it goes. I'd like to get some feedback from different projects with the new multi module support.

[metteo]

I added that multi module version to the project but Travis still tries to use 2.2.0... (https://travis-ci.org/metteo/jts/jobs/34036291) I will check that more carefully soon.

[trautonen]

The original issue by @jewzaam is now resolved in version 3.0.0. The plugin supports multi module report aggregation with any of the supported coverage tools. I will close this issue now. You can open a new issue if something still pops up.