I have two projects as follows, in neighbouring directories on the filesystem:

* project_a (-SNAPSHOT)
* project_b (-SNAPSHOT, depends on project_a)

I'd like to build project_b and for Maven to discover that project_a exists on 
the filesystem and thus build it rather than look in the local repo for its 
artifact.

I could build these within an aggregator and use the reactor to select 
project_b i.e.

mvn --projects project_b [goal]

However, this is problematic because

* this two-project example is a simplification of my real build, which consists 
of dozens of projects, and I don't want to have to maintain an aggregator 
project that lists all of them.
* I only want to recursively build -SNAPSHOT dependencies

Is there a neat way I could get Maven to perform a recursive build that looks 
on the filesystem to find -SNAPSHOT dependency projects and builds them?
I'm familiar with Maven plugin development, but haven't yet found any clues 
toward a solution in the Maven / Aether documentation.

Chris Beach

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