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https://issues.apache.org/jira/browse/MNG-7033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17418111#comment-17418111
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Marcel Stör commented on MNG-7033:
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Just hit this and thought "Gee, Maven...if I explicitly tell you NOT to build
module-X you shouldn't complain if module-X isn't there".
I see that, although not explicitly mentioned, with
https://github.com/apache/maven/pull/446/files#diff-47ee27138d1f3dc574d6b9bdb7e15ea07a541336a8bfda4aa050af4272cbf118R135
(stemming from MNG-6511) I can _exclude optional modules_ which is sort of
brain twister: {{!?test4}} -> ignore it if it's there, I guess.
Q1: can this be closed now?
Q2: [~agentgt], [~martinkanters] in your opinion, what is an acceptable
workaround for Maven 3.6+ to have Maven not fail on missing excluded modules? I
can't resort to profiles.
> Excluded projects through -pl should not need to be in the reactor
> ------------------------------------------------------------------
>
> Key: MNG-7033
> URL: https://issues.apache.org/jira/browse/MNG-7033
> Project: Maven
> Issue Type: Improvement
> Components: Command Line
> Affects Versions: 3.6.0, 3.6.1, 3.6.3
> Reporter: Adam Gent
> Priority: Major
>
> TLDR if you exclude a module using {{!module}} or {{-module}} with {{-pl}}
> that module needs to somehow be in the resolved reactor.
> We have custom build scripts (e.g. shells scripts or makes) that will make a
> certain subset of the project using {{-pl}}. However some modules we want to
> always exclude. (Yes we could use profiles but the maintenance of that
> solution is unacceptable to us).
> Thus if we do something like this:
> {code:sh}
> mvn install -pl "snaphop-cache,-snaphop-http" -amd
> {code}
> We may or not may not get the following depending on whether snaphop-cache
> has a downstream dependency on snaphop-http:
> {code}
> [INFO] Scanning for projects...
> [ERROR] [ERROR] Could not find the selected project in the reactor:
> snaphop-http @
> [ERROR] Could not find the selected project in the reactor: snaphop-http ->
> [Help 1]
> [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/MavenExecutionException
> {code}
> Thus it becomes nontrivial to exclude a module. One has to know whether or
> not {{snaphop-cache}} will trigger {{snaphop-http}} to be in the reactor.
> Furthermore the command may fail if some one changes dependencies (not
> project structure or modules).
> I find that to be alarming. {{-pl}} shouldn't fail if dependencies change.
> Its notable that the following is completely fine:
> {code:sh}
> mvn install -pl "snaphop-cache,snaphop-http" -amd
> {code}
> Which is confusing and inconsistent that one can't then add {{-}}.
> My recommendation is if -pl can't find the exclusion module in the currently
> selected reactor is just ignores it or perhaps issues a warning.
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