Issues with reference.conf in libraries not getting referenced after pulling library out of main project and into Nexus

[Richard Ney]

We have a project that's composed of 5 different SBT projects. All of the SBT projects originally pulled a common library so it was built with each component and contained some common classes and reference.conf files. In our latest revision we've pulled the common library out into a separate build with the library getting published and pulled from a Nexus repository.

After changing the reference in the SBT projects so it pulls from Nexus we've noticed that the default values inside our reference.conf files aren't getting pulled. The easiest example was akka.actor.provider is specified in reference.conf inside our common-cluster-model-1.1.0-M3.jar file but I've had to include this inside the main application's application.conf to get the application to start up.

-Richard

[Patrik Nordwall]

You should never try to override properties defined in one reference.conf in another reference.conf. The order is undefined and you will not know what you are running. In other words, Akka properties should be defined in application.conf, never in reference.conf outside Akka.

The purpose of reference.conf is for a library to define default values. One library cannot override default values of another library.

/Patrik

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[Richard Ney]

Kinda suspected that would be your answer 😎

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[Roland Kuhn]

Another way to put this: yeah, you can do this, but you’ll have to use a suitable ClassLoader implementation that you control :-)