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Subject: Re: Graph of lifecycle and plugin executions
From: Jason van Zyl <jason@takari.io>
In-Reply-To: <e43b0bff-0047-41ce-80c7-9428c5500177@email.android.com>
Date: Tue, 17 Nov 2015 11:22:39 -0500
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Message-Id: <A9E9EF43-DCF2-42E5-9640-DD6CBBD8A881@takari.io>
References: <e43b0bff-0047-41ce-80c7-9428c5500177@email.android.com>
To: Maven Users List <users@maven.apache.org>


> On Nov 17, 2015, at 11:02 AM, Thomas Meyer <thomas@m3y3r.de> wrote:
>=20
> Hi,
>=20
> okay thanks.
>=20
> Another question:
>=20
> What does it mean when a mojo execution is forked?
>=20

It corresponds to the execute annotation[1] where if you execute a goal =
and need to make sure the prerequisite lifecycle has run prior to said =
goal then Maven will =E2=80=9Cfork=E2=80=9D a lifecycle to make sure =
this requirement is met. Before the goal is executed the lifecycle is =
run up to the phase you specify your goal needs. So your Mojo might have =
something like:

@Execute(phase=3D=E2=80=9CLifecyclePhase.COMPILE=E2=80=9D)

As your mojo needs to operate on compiled classes this will make sure =
the compiled classes are there.

[1]: =
https://github.com/apache/maven-plugin-tools/blob/trunk/maven-plugin-annot=
ations/src/main/java/org/apache/maven/plugins/annotations/Execute.java

> I tried to find some documentation about it, but I failed.
>=20
> The maven CLI execution event logger class seems to give some hint:
>>>> fork started and so on.
>=20
> Given the following pom =
https://github.com/thomasmey/einkaufsliste-server/blob/master/pom.xml
>=20
> The wildfly-swarm-plugin has two executions, but the compiler step and =
the annotation preprocessor plugin seems to be executed for both mojo =
executions? Why is that? I had the idea that each mojo execution happens =
only once without all predecessors for each defined execution step, but =
that doesn't seem to be the case.
>=20
> So who can bring some light in this and/or point me in the right =
direction and some documentation?
>=20
> With kind regards
> Thomas
>=20
>=20
> Am 16.11.2015 4:04 nachm. schrieb Jason van Zyl <jason@takari.io>:
>>=20
>> If you use Eclipse you can go to the project properties and from =
there Maven > Lifecycle Mapping and you=E2=80=99ll see something like =
this:
>>=20
>>=20
>>=20
>> If you don=E2=80=99t use Eclipse you can probably use this:
>>=20
>> https://github.com/takari/maven-profiler
>>=20
>> It was made for profiling but will show you the executions. There is =
another more recent tool that shows the lifecycle but I can=E2=80=99t =
recall at the moment what that is. I will try to remember and post when =
I do.
>>=20
>>> On Nov 16, 2015, at 9:55 AM, Thomas Meyer <thomas@m3y3r.de> wrote:
>>>=20
>>> Hi,
>>>=20
>>> How can I print a graph of a given maven invocation with the =
lifecycle
>>> and for each lifecycle step which plugins are executed?
>>>=20
>>> E.g.
>>>=20
>>> lifecycle:
>>>  step 3: generate-sources
>>>    plugin 1 - maven-processor-plugin
>>>    plugin 2 - ...
>>>  step 4: process-sources
>>>    plugin 1 - xxx
>>>=20
>>> because in my pom, a plugin is executed several times but it =
shouldn't!
>>> So i want to find out why. I tried with mvn -X but I couldn't see =
why a
>>> plugin was executed twice.
>>>=20
>>> with kind regards
>>> thomas
>>>=20
>>>=20
>>>=20
>>> =
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>>>=20
>>=20
>> Thanks,
>>=20
>> Jason
>>=20
>> ----------------------------------------------------------
>> Jason van Zyl
>> Founder, Takari and Apache Maven
>> http://twitter.com/jvanzyl
>> http://twitter.com/takari_io
>> ---------------------------------------------------------
>>=20
>> First, the taking in of scattered particulars under one Idea,
>> so that everyone understands what is being talked about ... Second,
>> the separation of the Idea into parts, by dividing it at the joints,
>> as nature directs, not breaking any limb in half as a bad carver =
might.
>>=20
>>   -- Plato, Phaedrus (Notes on the Synthesis of Form by C. Alexander)
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
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>=20
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> To unsubscribe, e-mail: users-unsubscribe@maven.apache.org
> For additional commands, e-mail: users-help@maven.apache.org

Thanks,

Jason

----------------------------------------------------------
Jason van Zyl
Founder, Takari and Apache Maven
http://twitter.com/jvanzyl
http://twitter.com/takari_io
---------------------------------------------------------

Be not afraid of growing slowly, be only afraid of standing still.

 -- Chinese Proverb


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