Cintia DR created MNG-5565:
------------------------------
Summary: Aggregator style plugin with requiresDependencyResolution
retrieving reactor artefacts from remote instead
Key: MNG-5565
URL: https://jira.codehaus.org/browse/MNG-5565
Project: Maven 2 & 3
Issue Type: Bug
Affects Versions: 3.0.5
Reporter: Cintia DR
Attachments: aggregator.zip
If you have a aggregator-style plugin with requiresDependencyResolution, maven
will try to download artefacts from remote (if they are not in your local
repository or if you have a 'always' policy for that remote repository).
Attaching the plugin to different phases or CLI didn't change the behaviour.
If the artefact actually exists in your remote repository, maven will download
it. Even worse if you include this aggregator-stype plugin as part of the
lifecycle of module, because then the dependencies downloaded will be used
instead of the one built in the reactor for the rest of the build. It's pretty
scary to build artefacts half reactor/half remote maven as a side effect of
calling a plugin that just wants to print the dependencies.
If the artefact doesn't exist in your maven local repo or remote, maven will
continue and the following warning:
{noformat}
The following dependencies could not be resolved at this point of the build but
seem to be part of the reactor
{noformat}
That lead me to MNG-2277, and I would happily accept the warning if maven
wasn't actually downloading and using the downloaded dependency instead of the
ones built in the reactor.
If the artefact exists in your local repo, looks like that one is being used
(I'm not sure here).
The workaround I've found (only in maven 3) is to use
requiresDependencyCollection (instead of requiresDependencyResolution), then I
have to identify which ones are in the reactor, and just resolve the other
ones. It doesn't feel right, I kinda trust maven to identify what is the
reactor and what is not (even for aggregator-style plugins), and never override
the reactor.
Full log:
{noformat}
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] my-nice-project
[INFO] child1
[INFO] child2
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building my-nice-project 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading:
https://mynexus.com/content/groups/internal/com/mycompany/project/child1/1.0-SNAPSHOT/maven-metadata.xml
Downloading:
https://mynexus.com/content/groups/internal/com/mycompany/project/child1/1.0-SNAPSHOT/maven-metadata.xml
Downloading:
https://mynexus.com/content/groups/internal/com/mycompany/project/child1/1.0-SNAPSHOT/child1-1.0-SNAPSHOT.jar
Downloading:
https://mynexus.com/content/groups/internal/com/mycompany/project/child1/1.0-SNAPSHOT/child1-1.0-SNAPSHOT.jar
[WARNING] The following dependencies could not be resolved at this point of the
build but seem to be part of the reactor:
[WARNING] o com.mycompany.project:child1:jar:1.0-SNAPSHOT (compile)
[WARNING] Try running the build up to the lifecycle phase "package"
[INFO]
[INFO] --- myaggregator-maven-plugin:1.0-SNAPSHOT:list-deps (default-cli) @
my-nice-project ---
[INFO] >>>>>> Project: my-nice-project
[INFO] ---------------
[INFO] >>>>>> Project: child1
[INFO] - junit:junit:jar:4.11
[INFO] - org.hamcrest:hamcrest-core:jar:1.3
[INFO] ---------------
[INFO] >>>>>> Project: child2
[INFO] - com.mycompany.project:child1:jar:1.0-SNAPSHOT
[INFO] - junit:junit:jar:4.11
[INFO] - org.hamcrest:hamcrest-core:jar:1.3
[INFO] - org.apache.logging.log4j:log4j-api:jar:2.0-beta9
[INFO] ---------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] my-nice-project ................................... SUCCESS [4.280s]
[INFO] child1 ............................................ SKIPPED
[INFO] child2 ............................................ SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.495s
[INFO] Finished at: Fri Jan 17 17:10:10 EST 2014
[INFO] Final Memory: 6M/143M
[INFO] ------------------------------------------------------------------------
{noformat}
I've attached the simplest example I could think of.
- Open zip file
- cd my-aggregator-plugin; mvn install
- rm -rf ~/.m2/repository/com/mycompany/project/
- cd my-nice-project; mvn
com.mycompany.mavenplugin:myaggregator-maven-plugin:1.0-SNAPSHOT:list-deps
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