IIUC the aggregator only works when calling a goal directly, not as part of the lifecycle.
That's why release:prepare / release:perform works
I can't think of a plugin that is part of the lifecycle AND which act as an aggregator.

thanks,
Robert



On Mon, 08 Jan 2018 14:25:36 +0100, Francois MAROT <francois.ma...@gmail.com> wrote:

Thanks for your response Hervé,

I've made a sample plugin here:
https://github.com/fmarot/print-dummy-maven-plugin
When included in the "<build><plugins>" section of a parent pom of a
multimodule Maven project, the behavior is shown: when running 'mvn
validate', "dummy" is printed for for each and every child execution and in
the parent.
As I set aggregator to "true" in my Mojo, I expected it to be executed only
once.

I can provide a sample multimodule if needed.

Regards



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