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http://jira.codehaus.org/browse/MNG-4587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=235497#action_235497
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Jeroen Ruijgers commented on MNG-4587:
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the most likely cause is that the dependency is installed (with
maven-install-plugin) in the remote repository and not deployed (with
maven-deploy-plugin). The deploy plugin create's a new snapshot version which
is identifiable by maven.
> command line option "-update-snapshots" does not work for parent POMs (Maven
> 2 also affected)
> ---------------------------------------------------------------------------------------------
>
> Key: MNG-4587
> URL: http://jira.codehaus.org/browse/MNG-4587
> Project: Maven 2 & 3
> Issue Type: Bug
> Components: Artifacts and Repositories
> Affects Versions: 2.2.1
> Reporter: Peter Niederwieser
> Priority: Critical
>
> Since I didn't get any response to my comment on MNG-4433, I've opened a new
> issue. The following is from my original comment.
> I have exactly the same issue with 2.2.1. After changing and deploying parent
> POM, I run build with -U (on a different machine). Excerpt from output:
> {noformat}
> [INFO] snapshot org.spockframework:spock-parent:0.4-groovy-1.7-SNAPSHOT:
> checking for updates from central
> [17:48:33]: Downloading:
> http://xxx/artifactory/repo/org/spockframework/spock-parent/0.4-groovy-1.7-SNAPSHOT/spock-parent-0.4-groovy-1.7-SNAPSHOT.pom
> [17:48:33]: Downloading:
> http://xxx/artifactory/repo/org/spockframework/spock-maven/0.4-groovy-1.7-SNAPSHOT/spock-maven-0.4-groovy-1.7-SNAPSHOT.jar
> {noformat}
> Maven says that it is downloading spock-parent POM, but it doesn't end up in
> the local repo. Compare to the output after manually deleting the old POM
> from the local repo:
> {noformat}
> [INFO] snapshot org.spockframework:spock-parent:0.4-groovy-1.7-SNAPSHOT:
> checking for updates from central
> Downloading:
> http://xxx/artifactory/repo/org/spockframework/spock-parent/0.4-groovy-1.7-SNAPSHOT/spock-parent-0.4-groovy-1.7-SNAPSHOT.pom
> 8K downloaded (spock-parent-0.4-groovy-1.7-SNAPSHOT.pom)
> {noformat}
> Here we get "8K downloaded", which we didn't get before. The local repo now
> contains the correct POM, and the build succeeds.
> Here is what the local repo looked like before I manually deleted the old POM:
> {noformat}
> drwxr-xr-x 6 pniederw admin 204 Mar 5 16:48 .
> drwxr-xr-x 3 pniederw admin 102 Dec 14 13:47 ..
> -rw-r--r-- 1 pniederw admin 331 Mar 5 16:48 maven-metadata-central.xml
> -rw-r--r-- 1 pniederw admin 40 Mar 5 16:48
> maven-metadata-central.xml.sha1
> -rw-r--r-- 1 pniederw admin 9048 Mar 5 16:48
> spock-parent-0.4-groovy-1.7-SNAPSHOT.pom
> -rw-r--r-- 1 pniederw admin 40 Dec 14 13:47
> spock-parent-0.4-groovy-1.7-SNAPSHOT.pom.sha1
> {noformat}
> As you can see, the POM's last modified date is recent, but nevertheless the
> content is old. In fact it still matches the pom.sha1, which was last updated
> in December! How is this possible?
> This is a very insidious bug, and you would help a lot of people by fixing it
> ASAP.
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