Interesting. Given that Maven 4 will include the wrapper; wrapper files are 
kept at $ROOT/.mvn; running a wrapper from a child project requires that 
$ROOt/.mvn be known (from the outside even). Thus the value of the top most 
basedir can be guaranteed. 

Of course this works only if there is a .mvn dir at the top. Hoping that will 
be the common case in the future, could we have a way to expose that dir by 
default as soon as Maven boots up? Fall back to a warning when the directory is 
not found. 

Thoughts?

Sent from my primitive tricorder

> On 18 Feb 2021, at 14:15, Delany <delany.middle...@gmail.com> wrote:
> 
> Following on a bit, I logged this ticket
> https://github.com/pascalgn/properties-maven-extension/issues/58
> so the property *git.dir.worktree* is available before the reactor starts.
> But now I've found a situation that even an extension can't help with:
> 
> Suppose I want to utilise an alternative settings.xml file. I can place it
> in .mvn/settings.xml and add --settings=.mvn/settings.xml to
> .mvn/maven.config
> 
> But this only works when I build from the highest basedir. No property is
> yet available to say --settings=${highest-basedir}/.mvn/settings.xml
> 
> And yet Maven was clearly able to find the .mvn directory. So if we can
> take that as the highest-basedir, it just remains to give that location a
> name and make it available.
> 
> Anyone see any issues with this?
> 
> Thanks,
> 
> On Mon, 8 Feb 2021 at 07:35, Alexander Kriegisch <alexan...@kriegisch.name>
> wrote:
> 
>>> I think the reason someone might want their projects all in the same
>>> directory is because Eclipse has issues with nested project
>>> structures.
>> 
>> I see how that can be a pain in the ***. I was unaware of this problem,
>> being an IntelliJ IDEA user.
>> 
>> --
>> Alexander Kriegisch
>> https://scrum-master.de
>> 
>> 
>> Delany schrieb am 07.02.2021 12:19 (GMT +07:00):
>> 
>>> Hopefully our conversation will benefit others who've experienced the
>> same
>>> issue, so thank you for showing that it works in some cases. I think the
>>> reason someone might want their projects all in the same directory is
>>> because Eclipse has issues with nested project structures.
>>> 
>>> @Lasse, the directory-of goal of directory-maven-plugin seems even more
>>> idiot-proof than highest-basedir, so im using that.
>>> 
>>> Delany
>>> 
>>> On Sun, 7 Feb 2021 at 03:29, Alexander Kriegisch <
>> alexan...@kriegisch.name>
>>> wrote:
>>> 
>>>>> It seems the goal assumes that child modules sit in nested
>>>>> directories.
>>>> 
>>>> Well, that might be the case. I have never tested any other scenario
>>>> because this is how I organise my Maven projects. Neither am I a Maven
>>>> expert nor did I claim that my solution works for everybody in every
>>>> case. I just read a message on the list, remembered that I used to
>>>> struggle with a similar problem in the past and offered my solution
>>>> because it *works for me*. If it does not work for you because your
>>>> child modules are not in nested directories, I am sorry. I am more the
>>>> "convention over configuration" type, trying to keep it simple.
>>>> 
>>>> Regards
>>>> --
>>>> Alexander Kriegisch
>>>> https://scrum-master.de
>>>> 
>>>> 
>>>> Delany schrieb am 06.02.2021 21:07 (GMT +07:00):
>>>>> 
>>>>> 
>>>>> It seems the goal assumes that child modules sit in nested
>> directories.
>>>>> 
>>>>> Unzip and run mvn validate in the root directory, and you'll see the
>> root
>>>>> location for project sarek is incorrect.
>>>>> 
>>>>> Delany
>>>>> 
>>>>> 
>>>>> On Sat, 6 Feb 2021 at 14:28, Alexander Kriegisch <
>>>> alexan...@kriegisch.name
>>>>> <mailto:alexan...@kriegisch.name> > wrote:
>>>>> 
>>>>>> Maybe I misunderstand you, but for me this works nicely in a module
>>>> which
>>>>>> has a parent of type POM which has the root (also of type POM) as
>>>> parent.
>>>>>> I.e. the root POM is the grandparent. I have no issues, as long as
>> the
>>>>>> property is declared in the root as shown in the project I linked to.
>>>>>> --
>>>>>> Alexander Kriegisch
>>>>>> https://scrum-master.de
>>>>>> 
>>>>>> 
>>>>>> Delany schrieb am 06.02.2021 17:24 (GMT +07:00):
>>>>>> 
>>>>>>> This only works if the parent is the root. If you extend to a third
>>>>>> level
>>>>>>> of pom, it will report the rootlocation as the project directory.
>>>>>>> 
>>>>>>> On Sat, 6 Feb 2021 at 04:22, Alexander Kriegisch
>>>>>> <alexan...@kriegisch.name
>>>>>> <mailto:alexan...@kriegisch.name> >
>>>>>>> wrote:
>>>>>>> 
>>>>>>>> I had some discussion with Karl Heinz Marbaise about
>>>>>>>> maven.multiModuleProjectDirectory a while ago (cannot remember
>> where
>>>>>>>> exactly) and he strongly advised me not to use it as it is for
>>>>>> internal
>>>>>>>> use only. Even so, other tools such as IntelliJ IDEA use it
>>>>>> internally,
>>>>>>>> but not consequently, the situationis a bit messy.
>>>>>>>> 
>>>>>>>> What I ended up doing was to use Build Helper Maven Plugin >=
>> 3.2.0
>>>>>>>> (because of
>>>>>>>> 
>>>>>> https://github.com/mojohaus/build-helper-maven-plugin/issues/48)
>>>>>> and
>>>>>>>> there to use the "rootlocation" goal. I am not sure if that is
>>>> working
>>>>>>>> for you here because you said you need it somewhere in a plugin
>> and I
>>>>>>>> just use it in my project's root POM. For IDEA I still need need
>>>>>>>> "-DprojectRootDir=..." in <projectRootDir>/.mvn/jvm.config, but
>> from
>>>>>> the
>>>>>>>> command line it works, even when building from a module
>> subdirectory.
>>>>>>>> Here is my POM (just search for the string "rootlocation" there,
>> you
>>>>>>>> should find 4 places):
>>>>>>>> 
>>>>>>>> https://github.com/SarekTest/Sarek/blob/master/pom.xml
>>>>>>>> --
>>>>>>>> Alexander Kriegisch
>>>>>>>> https://scrum-master.de
>>>>>>>> 
>>>>>>>> 
>>>>>>>> Falko Modler schrieb am 06.02.2021 04:35 (GMT +07:00):
>>>>>>>> 
>>>>>>>>> For me, no problem on Jenkins either (using "withMaven" pipeline
>>>>>> step).
>>>>>>>>> There used to be this issue:
>>>>>>>> https://issues.jenkins.io/browse/JENKINS-35335
>>>>>>>>> Which turned out to be a Maven bug which was fixed in 3.5.0:
>>>>>>>>> https://issues.apache.org/jira/browse/MNG-5889
>>>>>>>>> 
>>>>>>>>> As far as MNG-5830 is concerned, I don't know what (special)
>> setup
>>>>>> the
>>>>>>>>> affected people are using.
>>>>>>>>> 
>>>>>>>>> I can only say/repeat that you need a .mvn directory to have the
>>>>>>>>> property point to your root directory.
>>>>>>>>> But even without .mvn, there should not be such an error
>> message,
>>>> so
>>>>>> IDK
>>>>>>>>> what's going on in those cases.
>>>>>>>>> 
>>>>>>>>> Am 05.02.2021 um 22:13 schrieb Delany:
>>>>>>>>>> Maybe for you Falko, but not my Jenkins server with Maven
>> 3.6.3,
>>>> or
>>>>>>>> these
>>>>>>>>>> other users
>>>>>>>>>> 
>>>>>> https://issues.apache.org/jira/plugins/servlet/mobile#issue/MNG-5830
>>>>>>>>>> Delany
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> On Fri, 5 Feb 2021, 22:25 Falko Modler, <f.mod...@gmx.net
>>>>>> <mailto:f.mod...@gmx.net> > wrote:
>>>>>>>>>> 
>>>>>>>>>>> I've been using maven.multiModuleProjectDirectory in various
>>>>>> projects
>>>>>>>>>>> (and have also seen it in others).
>>>>>>>>>>> You'll need a .mvn directory in your root directory to make it
>>>>>> work.
>>>>>>>>>>> 
>>>>>>>>>>> PS: I know that there has been some controvery about this
>>>> property
>>>>>> but
>>>>>>>>>>> well, it works! ;-)
>>>>>>>>>>> 
>>>>>>>>>>> Cheers,
>>>>>>>>>>> Falko
>>>>>>>>>>> 
>>>>>>>>>>>> Am 05.02.2021 um 17:03 schrieb Andres Almiray:
>>>>>>>>>>>>> Hello everyone,
>>>>>>>>>>>>> 
>>>>>>>>>>>>> Is there a way to reliably resolve the value of the root
>>>>>>> directory
>>>>>>>>> for a
>>>>>>>>>>>>> given multi-project build?
>>>>>>>>>>>>> Unfortunately ${session.executionRootDirectory} does not
>>> seem to
>>>>>>> work
>>>>>>>>> for
>>>>>>>>>>>>> all cases, it might work when used inside a plugin's
>>>>>>> <configuration>
>>>>>>>>>>>>> section but does not when used outside of plugins
>>>>>>>>>>>>> 
>>>>>>>>>>>>> TIA
>>>>>>>>>>>>> 
>>>>>>>>>>>>> Cheers,
>>>>>>>>>>>>> Andres
>>>>>>>>>>>>> 
>>>>>>>>>>>>> -------------------------------------------
>>>>>>>>>>>>> Java Champion; Groovy Enthusiast
>>>>>>>>>>>>> http://andresalmiray.com
>>>>>>>>>>>>> http://www.linkedin.com/in/aalmiray
>>>>>>>>>>>>> --
>>>>>>>>>>>>> What goes up, must come down. Ask any system administrator.
>>>>>>>>>>>>> There are 10 types of people in the world: Those who
>>> understand
>>>>>>>>> binary,
>>>>>>>>>>>> and
>>>>>>>>>>>>> those who don't.
>>>>>>>>>>>>> To understand recursion, we must first understand recursion.
>>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>>> 
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>>>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> 
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