title: Nexus repository contains artifact but only makes POM available
body: <p>I have a Nexus instance with Maven 2 repositories hosted on a non-Internet-connected corporate development domain. I need to use the <strong>maven-jaxb-schemagen</strong> plugin from Sun, however, it was only available in Maven 1 format (along with many other Maven 1 dependencies, so this is not a one-off edge case). </p>
  
  <p>I made a new Maven 1 hosted repository in Nexus (<strong>maven1</strong>), then made a Maven1-to-Maven2 virtual repository as well (<strong>maven1as2</strong>). Because some of the needed artifacts are snapshots, the policy for <strong>maven1</strong> (and by extension <strong>maven1as2</strong>) is <strong>Snapshot</strong>. </p>
  
  <p>I imported all of the Maven 1 artifacts through the filesystem to this repository's overridden local storage location. </p>
  
  <p>I then added <strong>maven1as2</strong> to my <strong>Public Repositories</strong> group. Some of the reference I have found says that Nexus will not allow you to browse or search a Maven1 repository. I have had mixed results. If I select <strong>Public Repositories</strong> or <strong>maven1as2</strong> in Nexus, I can go to <strong>Browse Storage</strong> and drill down to <strong>com/sun/tools/jxc/maven2/maven-jaxb-schemagen-plugin/1.3-SNAPSHOT/</strong> and view the <strong>maven-jaxb-schemagen-plugin-1.3-SNAPSHOT.pom</strong> file and its checksum. However, I cannot view the <strong>JAR</strong> artifact that should be there and is on the filesystem. </p>
  
  <p>When I try to use Maven to build, I get the following:</p>
  
  <pre><code>$ mvn clean compile
  [INFO] Scanning for projects...
  [INFO] Reactor build order:
  [INFO]   MyProject
  [INFO]   MyModule1
  [INFO]   MyModule2
           ...
  [INFO] ---------------------------------------------------------------------------
  [INFO] Building MyProject
  [INFO]    task-segment: [clean, compile]
  [INFO] ---------------------------------------------------------------------------
  [INFO] [clean:clean {execution: default-clean}]
  [INFO] [cobertura:clean {execution: default}]
  [INFO] No goals needed for project - skipping
  [INFO] ---------------------------------------------------------------------------
  [INFO] Building MyModule1
  [INFO]    task-segment: [clean, compile]
  [INFO] ---------------------------------------------------------------------------
  Downloading: http://my.nexus.server:8081/nexus/content/groups/public/com/sun/tools/jxc/maven2/maven-jaxb-schemagen-plugin/1.3-SNAPSHOT/maven-jaxb-schemagen-plugin-1.3-SNAPSHOT.pom
  6K downloaded (maven-jaxb-schemagen-plugin-1.3-SNAPSHOT.pom)
  [INFO] ---------------------------------------------------------------------------
  [ERROR] BUILD FAILURE
  [INFO] ---------------------------------------------------------------------------
  [INFO] A required plugin was not found: Plugin could not be found - check that the goal name is correct: Unable to download the artifact from any repository
  
  Try downloading the file manually from the project website.
  
  Then, install it using the command:
      mvn install:install-file -DgroupId=com.sun.tools.jxc.maven2 -DartifactId=maven-jaxb-schemagen-plugin -Dversion=1.3-SNAPSHOT -Dpackaging=maven-plugin -Dfile=path/to/file
  
  Alternatively, if you host your own repository you can deploy the file there:
      mvn deploy:deploy-file -DgroupId=com.sun.tools.jxc.maven2 -DartifactId=maven-jaxb-schemagen-plugin -Dversion=1.3-SNAPSHOT -Dpackaging=maven-plugin -Dfile=path/to/file -Durl=[url] -DrepositoryId=[id]
  
  
    com.sun.tools.jxc.maven2:maven-jaxb-schemagen-plugin:1.3-SNAPSHOT
  
  from the specified remote repositories:
    nexus (http://my.nexus.server:8081/nexus/content/groups/public)
  
  
    com.sun.tools.jxc.maven2:maven-jaxb-schemagen-plugin:1.3-SNAPSHOT
  
  from the specified remote repositories:
    nexus (http://my.nexus.server:8081/nexus/content/groups/public)
  
  [INFO] ---------------------------------------------------------------------------
  [INFO] For more information, run Maven with the -e switch
  [INFO] ---------------------------------------------------------------------------
  [INFO] Total time: 2 seconds
  [INFO] Finished at: Tue Jul 06 15:05:08 EDT 2010
  [INFO] Final Memory: 7M/17M
  [INFO] ---------------------------------------------------------------------------
  </code></pre>