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…

Accepted Answer

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.

SBT dependsOn RootProject: doesn't compile the dependency

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