pre/postGoal defined in plugins are only called once during multiproject goals

pre/postGoal defined in plugins are only called once during multiproject goals.

You can reproduce this problem by the following:

maven genapp -Dmaven.genapp.template=default -Dmaven.genapp.template.id=parent -Dmaven.genapp.template.name=Parent -Dmaven.genapp.template.package=parent
create child1 and child2 directories
in child1 directory:
maven genapp -Dmaven.genapp.template=default -Dmaven.genapp.template.id=child1 -Dmaven.genapp.template.name=Child1 -Dmaven.genapp.template.package=child1
in child2 directory:
maven genapp -Dmaven.genapp.template=default -Dmaven.genapp.template.id=child2 -Dmaven.genapp.template.name=Child2 -Dmaven.genapp.template.package=child2

running maven multiproject:goal -Dgoal=clean in the parent project gives the following:

<snip />
+----------------------------------------

clean:clean:
Running post goal: clean:clean
+----------------------------------------

clean:

build:end:

build:start:

clean:clean:

clean:

build:end:
<snip />

The "Running post goal: clean:clean" appears only once. (If you run maven multiproject:clean, you will see that it only gets run on the parent project.)

As a workaround, you need to copy the pre/postGoal from the plugin.jelly to each (except for the first) project's maven.xml. However, this will cause multiple runs when you do individual child runs.