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From Curtis Rueden <ctrue...@wisc.edu>
Subject Re: Referencing a parent POM without relativePath
Date Mon, 26 Nov 2012 16:58:36 GMT
Hi Eric & everyone,

> I still think the <userFriendly>true</userFriendly> version of Maven
> would just do the right thing when there is no <relativePath/>
> element, and there is no ../pom.xml.

I agree. Note that there is an issue for it already:

  http://jira.codehaus.org/browse/MNG-4687

Regards,
Curtis


On Sat, Nov 24, 2012 at 12:13 PM, Anders Hammar <anders@hammar.net> wrote:

> I'd just like to echo Benson. You do not need the <relativePath/> element
> if your environment is setup correctly.
>
> /Anders
>
>
> On Sat, Nov 24, 2012 at 4:48 AM, Eric Kolotyluk <eric.kolotyluk@gmail.com
> >wrote:
>
> > On 2012-11-23 7:01 PM, Benson Margulies wrote:
> >
> >> On Fri, Nov 23, 2012 at 8:45 PM, Eric Kolotyluk
> >> <eric.kolotyluk@gmail.com> wrote:
> >>
> >>> OK, I have added the following to our Corporate POM. Hopefully I, and
> >>> others, won't fall into this trap again.
> >>>
> >>> I still think the <userFriendly>true</**userFriendly> version
of Maven
> >>> would
> >>> just do the right thing when there is no <relativePath/> element,
and
> >>> there
> >>> is no ../pom.xml. I can see no value in the current Maven behavior of
> >>> throwing an error the way it does.
> >>>
> >> Eric,
> >>
> >> It does what you want. If it is not doing it for you, there's
> >> something wrong with your environment.
> >>
> >> None of our POMs have explicit relativePath elements, and they all
> >> work fine. The empty element is only needed when there *is* a
> >> ../pom.xml to avoid, but you are writing that you don't have one.
> >>
> >>
> > OK, I will play with this some more to see if I can replicate the problem
> > again.
> >
> > Cheers, Eric
> >
> >
> >
> >>  Cheers, Eric
> >>>
> >>>     <!--
> >>>         No parent for this POM! This is parent of all Kodak projects.
> >>>         Top Level Project POMs should reference this POM with
> >>>
> >>>         <parent>
> >>>           <groupId>com</groupId>
> >>>           <artifactId>kodak</artifactId>
> >>>           <version>1.0.0</version>
> >>>           <relativePath/>
> >>>         </parent>
> >>>
> >>>         The empty <relativePath/> element is necessary because
> com:kodak
> >>> is a
> >>> seperate project that will never be in
> >>>         the parent directory of your project. If <relativePath/> is
> >>> missing,
> >>> Maven will look in ../ by default, and
> >>>         then throw an error because it cannot find ../pom.xml (and you
> >>> should
> >>> never have ../pom.xml).
> >>>     -->
> >>>
> >>>
> >>> On 2012-11-23 12:47 PM, David Karr wrote:
> >>>
> >>>> I had also discovered the difference between the missing vs. empty
> >>>> "relativePath" element.  Although it was initially disconcerting that
> I
> >>>> had
> >>>> to specify an empty "relativePath" element to get what I assumed was
> the
> >>>> most reasonable behavior, I can also see the logic of the alternative
> >>>> with
> >>>> the default value. I prefer to separate the notion of "parent" pom
> from
> >>>> "aggregator" pom (a pom with a list of modules), but if you use a
> >>>> strategy
> >>>> that combines them, then the default value is more likely.
> >>>>
> >>>>
> >>>> On Fri, Nov 23, 2012 at 12:34 PM, Eric Kolotyluk
> >>>> <eric.kolotyluk@gmail.com>**wrote:
> >>>>
> >>>>  DOH! I retract that previous message. I forgot to open my VPN
> >>>>> connection
> >>>>> first.
> >>>>>
> >>>>> Putting <relativePath/> in the POM does work!
> >>>>>
> >>>>> So, would it be unreasonable if Maven treated the absence of the
> >>>>> <relativePath> element the same as <relativePath/>.
That would make
> it
> >>>>> more
> >>>>> user friendly as far as I am concerned.
> >>>>>
> >>>>> Also, it was m2e that built the original project POM, and it did
not
> >>>>> put
> >>>>> <relativePath/>  in the POM.
> >>>>>
> >>>>> Cheers, Eric
> >>>>>
> >>>>>
> >>>>>
> >>>>> On 2012-11-23 12:22 PM, Eric Kolotyluk wrote:
> >>>>>
> >>>>>  I tried putting <relativePath/> in my POM, but it does not
fix
> things.
> >>>>>>
> >>>>>>     <parent>
> >>>>>>       <groupId>com</groupId>
> >>>>>>       <artifactId>kodak</artifactId>
> >>>>>>       <version>0.0.11-SNAPSHOT</****version>
> >>>>>>       <relativePath/>
> >>>>>>     </parent>
> >>>>>>
> >>>>>> I still get
> >>>>>>
> >>>>>> C:\Users\Eric\workspace\tree-****combo-box>mvn clean
> >>>>>> [INFO] Scanning for projects...
> >>>>>> Downloading:
> >>>>>> http://repository.ca.kodak.****com:8082/nexus/content/groups/***
> >>>>>>
> >>>>>> *public/com/kodak/0.0.11-****SNAPSHOT/maven-metadata.xml<ht**
> >>>>>> tp://repository.ca.kodak.com:**8082/nexus/content/groups/**
> >>>>>> public/com/kodak/0.0.11-**SNAPSHOT/maven-metadata.xml<
> http://repository.ca.kodak.com:8082/nexus/content/groups/public/com/kodak/0.0.11-SNAPSHOT/maven-metadata.xml
> >
> >>>>>> >
> >>>>>> [WARNING] Could not transfer metadata
> >>>>>> com:kodak:0.0.11-SNAPSHOT/****maven-metadata.xml
> >>>>>> from/to nexus (http://repository.ca.kodak.**
> >>>>>>
> >>>>>> com:8082/nexus/content/groups/****public<http://repository.ca.**
> >>>>>> kodak.com:8082/nexus/content/**groups/public<
> http://repository.ca.kodak.com:8082/nexus/content/groups/public>
> >>>>>> >):
> >>>>>> repository.ca.kodak.com
> >>>>>> Downloading:
> >>>>>> http://repository.ca.kodak.****com:8082/nexus/content/groups/***
> >>>>>>
> >>>>>> *public/com/kodak/0.0.11-****SNAPSHOT/kodak-0.0.11-****SNAPSHOT.pom<
> >>>>>> http://**
> repository.ca.kodak.com:8082/**nexus/content/groups/public/*
> >>>>>> *com/kodak/0.0.11-SNAPSHOT/**kodak-0.0.11-SNAPSHOT.pom<
> http://repository.ca.kodak.com:8082/nexus/content/groups/public/com/kodak/0.0.11-SNAPSHOT/kodak-0.0.11-SNAPSHOT.pom
> >
> >>>>>> >
> >>>>>> [ERROR] The build could not read 1 project -> [Help 1]
> >>>>>> [ERROR]
> >>>>>> [ERROR]   The project
> >>>>>> net.kolotyluk.experiment:tree-****combo-box:0.0.1-SNAPSHOT
> >>>>>> (C:\Users\Eric\workspace\tree-****combo-box\pom.xml) has 1 error
> >>>>>> [ERROR]     Non-resolvable parent POM: Could not transfer artifact
> >>>>>> com:kodak:pom:0.0.11-SNAPSHOT from/to nexus
> >>>>>> (http://repository.ca.kodak.*
> >>>>>>
> >>>>>> *com:8082/nexus/content/**groups/**public<http://**
> >>>>>> repository.ca.kodak.com:8082/**nexus/content/groups/public<
> http://repository.ca.kodak.com:8082/nexus/content/groups/public>
> >>>>>> >):
> >>>>>> repository.ca.kodak.com and 'parent.relativePath' points at
no
> local
> >>>>>> POM
> >>>>>> @ line 9, column 11: Unknown host repository.ca.kodak.com ->
[Help
> 2]
> >>>>>> [ERROR]
> >>>>>> [ERROR] To see the full stack trace of the errors, re-run Maven
with
> >>>>>> the
> >>>>>> -e switch.
> >>>>>> [ERROR] Re-run Maven using the -X switch to enable full debug
> logging.
> >>>>>> [ERROR]
> >>>>>> [ERROR] For more information about the errors and possible
> solutions,
> >>>>>> please read the following articles:
> >>>>>> [ERROR] [Help 1] http://cwiki.apache.org/****
> >>>>>> confluence/display/MAVEN/**<
> http://cwiki.apache.org/**confluence/display/MAVEN/**>
> >>>>>>
> >>>>>> ProjectBuildingException<http:**//cwiki.apache.org/confluence/**
> >>>>>> display/MAVEN/**ProjectBuildingException<
> http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException>
> >>>>>> >
> >>>>>> [ERROR] [Help 2] http://cwiki.apache.org/****
> >>>>>> confluence/display/MAVEN/**<
> http://cwiki.apache.org/**confluence/display/MAVEN/**>
> >>>>>>
> >>>>>> UnresolvableModelException<htt**p://cwiki.apache.org/**
> >>>>>> confluence/display/MAVEN/**UnresolvableModelException<
> http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException
> >
> >>>>>> >
> >>>>>>
> >>>>>> It looks like Maven wants to download the Corporate POM because
it
> >>>>>> sees
> >>>>>> it in Nexus, but craps out because it does not like the Project
POM.
> >>>>>> Maven
> >>>>>> seems pretty certain that it wants parent.relativePath to point
to a
> >>>>>> local
> >>>>>> POM.
> >>>>>>
> >>>>>> Is there a <userFriendly>true</****userFriendly>
switch I can turn
> on
> >>>>>> somewhere in Maven ;-)
> >>>>>>
> >>>>>> Cheers, Eric
> >>>>>>
> >>>>>> On 2012-11-23 9:05 AM, Laird Nelson wrote:
> >>>>>>
> >>>>>>  On Fri, Nov 23, 2012 at 11:22 AM, Benson Margulies <
> >>>>>>> bimargulies@gmail.com>wrote:
> >>>>>>>
> >>>>>>>    You just name the G/A/V and no relativePath, and Maven
will
> >>>>>>> download
> >>>>>>>
> >>>>>>>> just as it would a dependency.
> >>>>>>>>
> >>>>>>>>    Well, not exactly; if there is no <relativePath>
element
> present,
> >>>>>>>> then
> >>>>>>>>
> >>>>>>> Maven behaves as though <relativePath>../pom.xml</****relativePath>
> >>>>>>> were
> >>>>>>> specified.  If that file is a working copy that has not
been
> >>>>>>> refreshed
> >>>>>>> from
> >>>>>>> the SCM, then problems can ensue.
> >>>>>>>
> >>>>>>> I recall that someone mentioned specifying a relative path
like
> this:
> >>>>>>>
> >>>>>>> <relativePath/>
> >>>>>>>
> >>>>>>>
> >>>>>>> ...and that that was the only way to force Maven to truly
resolve
> the
> >>>>>>> pom
> >>>>>>> from the repository, but I don't know if this is in fact
true.
> >>>>>>>
> >>>>>>> Best,
> >>>>>>> Laird
> >>>>>>>
> >>>>>>>
> >>>>>>>  ------------------------------****----------------------------**
> >>>>> --**---------
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> >>>>> users-unsubscribe@maven.**apac**he.org <http://apache.org><
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> users-unsubscribe@maven.apache.org>
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> >>>>>
> >>>>>
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