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From Laurence Bordowitz <>
Subject Re: Parent snapshot pom questions
Date Thu, 30 Jul 2015 16:57:00 GMT
Another solution is to try the extensions. One of them  has filesystem locks on
the local repo for exactly this scenario. I haven't tried these out on our CI pipeline yet,

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 -- Larry Bordowitz

     On Thursday, July 30, 2015 8:06 AM, Curtis Rueden <> wrote:

 Hi Dave,

Maven is not safe for concurrent builds from the same local repository
cache. Do these CI jobs share the same cache? If so that would explain the
nondeterminism you are seeing.

It is best practice if each job has its own local repo cache, as expensive
as that is disk-wise.

Or you can use only a single executor on each node doing Maven builds. But
of course that doesn't scale particularly well.

Also: is there some reason you don't just have a single job that builds the
whole multi-module project? What is the point of having a multi-module
project then? Or: if I misunderstood and these projects are each
single-module, why not use release couplings always (i.e., a release
version of the parent POM)? Then you won't have issues with SNAPSHOTs
getting nondeterministically overwritten etc.


On Thu, Jul 30, 2015 at 9:45 AM, David Hoffer <> wrote:

> I've got a case where we get random CI build failures.  The error is:
> [FATAL] Non-resolvable parent POM: Could not find artifact
> com.issinc.jms.jms-thirdparty.installers:installer-parent:pom:11.8.0-SNAPSHOT
> in nexus (https://mavenserver/nexus/content/groups/public) and
> 'parent.relativePath' points at wrong local POM @ line 43, column 13
> Here is the pom and build layout.
> - pom.xml (parent) This pom has level1 as module but does not have the
> others
> - level1 module
> -- pom.xml
> - level2 module (Has top level pom as parent)
> -- pom.xml
> - level3 module (Has top level pom as parent)
> -- pom.xml
> - level4 module (Has top level pom as parent)
> -- pom.xml
> Now for our CI builds they build this as 4 separate builds, here are what
> they checkout and build.
> - pom.xml (parent)
> - level1
> -- pom.xml
> - level2
> -- pom.xml
> - level3
> -- pom.xml
> - level4
> -- pom.xml
> The first build, builds pointing to the parent and deploys the parent pom
> to Nexus, this build always works.  The level2 to level4 builds don't
> checkout the parent pom as that is not part of the reactor of the build,
> yet it is still the parent.  What we expected to happen is that it would
> pull the parent pom from Nexus.  We have verified that it does exist in
> Nexus yet it can't find it.
> This error is random sometimes it works and sometimes it does not.  We have
> several build agents (14 or so).  The error might be agent specific, e.g.
> if the same agent did the parent/level1 build then it works but not if a
> different agent did it (not sure if that is the case yet).
> What I'm wondering is what is the Maven rules for finding parent (snapshot)
> poms that are not part of the current reactor's build?  We assumed it would
> follow the normal search order, e.g. local repo first, then Nexus but that
> does not seem to be happening.  The error says it is looking in Nexus but
> it doesn't appear to be doing that rather it seems to be looking on the
> local hard drive for the pom via 'parent.relativePath' but we don't even
> use relativePath at all in any of these poms.
> Any idea what is going on?
> .
> -Dave

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