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From "Claudio Bley (JIRA)" <j...@codehaus.org>
Subject [jira] (MNG-5459) failure to resolve pom artifact from snapshotVersion in maven-metadata.xml
Date Fri, 05 Apr 2013 06:22:52 GMT
Claudio Bley created MNG-5459:
---------------------------------

             Summary: failure to resolve pom artifact from snapshotVersion in maven-metadata.xml
                 Key: MNG-5459
                 URL: https://jira.codehaus.org/browse/MNG-5459
             Project: Maven 2 & 3
          Issue Type: Bug
          Components: Artifacts and Repositories
    Affects Versions: 3.0.5, 3.1.x
            Reporter: Claudio Bley
         Attachments: mvn-snapshot-resolve-fix.diff

We're using Artifactory on the server side, and ivy / sbt to publish artifacts  upstream.

After publishing several -SNAPSHOT versions of a project, trying to use it from Maven, resulted
in a warning and ultimately a build failure because it cannot determine the dependencies:

{code}[WARNING] The POM for com.foo:bar:jar:0.4.0-20130404.093655-3 is missing, no dependency
information available{code}

This is the corresponding maven-metadata-snapshots.xml:
{code:xml}
<metadata>
  <groupId>com.foo</groupId>
  <artifactId>bar</artifactId>
  <version>0.4.0-SNAPSHOT</version>
  <versioning>
    <snapshot>
      <timestamp>20130404.090532</timestamp>
      <buildNumber>2</buildNumber>
    </snapshot>
    <lastUpdated>20130404093657</lastUpdated>
    <snapshotVersions>
      <snapshotVersion>
        <extension>pom</extension>
        <value>0.4.0-20130404.090532-2</value>
        <updated>20130404090532</updated>
      </snapshotVersion>
      <snapshotVersion>
        <extension>jar</extension>
        <value>0.4.0-20130404.093655-3</value>
        <updated>20130404093655</updated>
      </snapshotVersion>
    </snapshotVersions>
  </versioning>
</metadata>
{code}

As you can see, the <value> for the jar artifact and the pom artifact differ:

0.4.0-20130404.093655-3
0.4.0-20130404.090532-2

Apparently, artifactory optimizes the case when an artifact doesn't change; it does not create
a new file, but just links to the existing one.

Maven, however, takes a shortcut and makes the erroneous assumption that the values for pom
and jar artifact always match up.

The attached patch fixes this.

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