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https://jira.codehaus.org/browse/MNG-5638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=347249#comment-347249
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Paul Benedict commented on MNG-5638:
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It would be nice to know whether this element is the exception or do all
elements suffer from accidental whitespace?
> Whitespaces matter in <mirrorOf> configuration can cause the incorrect repo
> to be selected
> ------------------------------------------------------------------------------------------
>
> Key: MNG-5638
> URL: https://jira.codehaus.org/browse/MNG-5638
> Project: Maven 2 & 3
> Issue Type: Bug
> Affects Versions: 3.2.1
> Reporter: Tobias Oberlies
>
> Steps to reproduce the problem:
> # Use the following settings.xml (replacing the URLs with valid URLs in your
> environment):
> {noformat}
> <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
> http://maven.apache.org/xsd/settings-1.0.0.xsd";>
> <mirrors>
> <mirror>
> <id>mirror1</id>
> <url>http://nexus:8081/nexus/content/repositories/releases/</url>
> <mirrorOf>
> external:*, !snapshots.repo
> </mirrorOf>
> </mirror>
> </mirrors>
> <profiles>
> <profile>
> <id>use-snapshots-repo</id>
> <pluginRepositories>
> <pluginRepository>
> <id>snapshots.repo</id>
>
> <url>http://nexus:8081/nexus/content/repositories/snapshots/</url>
> </pluginRepository>
> </pluginRepositories>
> <repositories>
> <repository>
> <id>snapshots.repo</id>
>
> <url>http://nexus:8081/nexus/content/repositories/snapshots/</url>
> </repository>
> </repositories>
> </profile>
> </profiles>
> <activeProfiles>
> <activeProfile>use-snapshots-repo</activeProfile>
> </activeProfiles>
> </settings>
> {noformat}
> # Set up a project which uses an artifact from {{snapshots.repo}} which is
> not available in the local Maven repository
> # Build the project: The build fails because Maven only tries to download
> from the releases repository.
> Expected behaviour: Maven should have used the snapshots repo.
> The root cause of the problem is that whitespaces around the separators in
> the {{mirrorOf}} configuration are not trimmed. When changing the
> configuration to
> {noformat}
> <mirrorOf>
> external:*,!snapshots.repo
> </mirrorOf>
> {noformat}
> the snapshots repository is used and the build passes.
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