SBT dependsOn RootProject: doesn't compile the dependency

Question

I have a pretty simple configuration:

  //lazy val bananaRdfProject = RootProject( uri("git://github.com:stample/banana-rdf.git#"+bananaGitBranch) )
  // lazy val bananaRdfProject = RootProject( uri("https://github.com/stample/banana-rdf.git#"+bananaGitBranch) )
  // lazy val bananaRdfProject = ProjectRef( uri("https://github.com/stample/banana-rdf.git#"+bananaGitBranch) ,"banana-rdf")
  lazy val bananaRdfProject = RootProject( file("../banana-rdf") )


  lazy val main = play.Project(appName, appVersion, appDependencies).settings(...)
                     .dependsOn( bananaRdfProject )

I tried using the 4 different project declarations above for bananaRdfProject.

As I may edit this banana-rdf locally, I want it to be recompiled each time I build my play project, so that I do not have to publish the banana-rdf...

But when I try to compile my main play project, that uses banana-rdf, it doesn't compile banana-rdf, but tries to compile the main project: the compilation fails because banana-rdf classes are missing in the classpath.

sebastien@clemence-XPS-L412Z:rww-play (master *%)$ ./play.old/play
[info] Loading project definition from /home/sebastien/Bureau/rww-play/project
[warn] there were 1 deprecation warning(s); re-run with -deprecation for details
[warn] one warning found
[info] Loading project definition from /home/sebastien/Bureau/banana-rdf/project
[info] Updating {file:/home/sebastien/Bureau/banana-rdf/project/}banana-rdf-build...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Compiling 2 Scala sources to /home/sebastien/Bureau/banana-rdf/project/target/scala-2.10/sbt-0.13/classes...
[warn] there were 11 deprecation warning(s); re-run with -deprecation for details
[warn] there were 2 feature warning(s); re-run with -feature for details
[warn] two warnings found
[info] Set current project to RWWeb (in build file:/home/sebastien/Bureau/rww-play/)
       _
 _ __ | | __ _ _  _
| '_ \| |/ _' | || |
|  __/|_|\____|\__ /
|_|            |__/

play 2.2-TLS built with Scala 2.10.3-RC3 (running Java 1.7.0_45), http://www.playframework.com

> Type "help play" or "license" for more information.
> Type "exit" or use Ctrl+D to leave this console.

[RWWeb] $ compile
[info] Updating {file:/home/sebastien/Bureau/banana-rdf/}banana...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Updating {file:/home/sebastien/Bureau/rww-play/}RWWeb...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Compiling 53 Scala sources and 1 Java source to /home/sebastien/Bureau/rww-play/target/scala-2.10/classes...
[error] /home/sebastien/Bureau/rww-play/app/controllers/CORSProxy.scala:4: object banana is not a member of package org.w3
[error] import org.w3.banana.plantain.Plantain
[error]               ^
[error] /home/sebastien/Bureau/rww-play/app/controllers/CORSProxy.scala:7: not found: type Plantain
[error] object CORSProxy extends org.www.readwriteweb.play.CORSProxy[Plantain](webClient) 
.................

Isn't it supposed to compile banana-rdf before trying to compile my main project? If not, what is the point of depending on an external RootProject?

Answer 1

The RootProject(file("../banana-rdf")) project reference just references the root project, and what you really need is a reference to the banana-rdf subproject (in the rdf subdirectory).

The available subprojects are defined in https://github.com/w3c/banana-rdf/blob/master/project/build.scala. There are a few:

[main]> projects
[info] In file:/Users/jacek/sandbox/stackoverflow/19832655/
[info]   * main
[info] In https://github.com/w3c/banana-rdf.git
[info]     banana
[info]     banana-jena
[info]     banana-rdf
[info]     banana-rdf-test-suite
[info]     banana-sesame
[info]     examples
[info]     experimental
[info]     ldp
[info]     patch

To reference banana-rdf you should then use the following ProjectRef pointing at a right module (subproject) in a build configuration. Note ProjectRef as well as the name of the subproject - banana-rdf.

lazy val bananaRdfProject =
  ProjectRef(uri("https://github.com/w3c/banana-rdf.git"), "banana-rdf")

With the ProjectRef you should be able to resolve any types defined in the banana-rdf subproject.