Nexus Won't Serve SNAPSHOTs From Default Public Group

Question

For some reason I can't get Nexus to serve my SNAPSHOT artifacts via the default public group. I've read the relevant bit of the Nexus manual and search Google, but nothing I do seems to work.

I've implemented the stuff in section 4.2. (Configuring Maven to Use a Single Nexus Group) of the manual, so my settings.xml looks like:

<settings>

  <mirrors>
    <mirror>
      <id>nexus</id>
      <mirrorOf>*</mirrorOf>
      <url>http://my-server/nexus/content/groups/public</url>
    </mirror>
  </mirrors>

  <profiles>
    <profile>
      <id>nexus</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <repositories>
        <repository>
          <id>central</id>
          <url>http://central</url>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>central</id>
          <url>http://central</url>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>

</settings>

Everything was working fine until I started building stuff on a clean machine (i.e. one I hadn't built any of the SNAPSHOT projects on) and it wouldn't down load the required SNAPSHOT dependencies. Maven gives me the following:

[INFO] Scanning for projects...
[INFO]       
[INFO] ------------------------------------------------------------------------
[INFO] Building MyCo Actions Base Classes 1.0.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: http://my-sever/nexus/content/groups/public/com/myco/testing/1.0.0-SNAPSHOT/maven-metadata.xml
Downloading: http://my-sever/nexus/content/groups/public/com/myco/testing/1.0.0-SNAPSHOT/maven-metadata.xml
Downloading: http://my-sever/nexus/content/groups/public/com/myco/testing/1.0.0-SNAPSHOT/testing-1.0.0-SNAPSHOT.pom
[WARNING] The POM for com.myco:testing:jar:1.0.0-SNAPSHOT is missing, no dependency information available
Downloading: http://my-sever/nexus/content/groups/public/com/myco/testing/1.0.0-SNAPSHOT/testing-1.0.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.023s
[INFO] Finished at: Tue Mar 08 15:55:23 GMT 2011
[INFO] Final Memory: 99M/480M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project actions-base: Could not resolve dependencies for project com.myco:actions-base:jar:1.0.0-SNAPSHOT: Could not find artifact com.myco:testing:jar:1.0.0-SNAPSHOT in nexus (http://my-sever/nexus/content/groups/public) -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

The problem being that testing-1.0.0-SNAPSHOT.jar doesn't exist, but testing-1.0.0-20110301.182820-1.jar does. How do I get Nexus to resolve the SNAPSHOT properly and serve me my JAR...?

Answer 1

I ended up getting it all working my removing the local releases and snapshot repositories from the public group and making the mirror, only mirror the public group rather than everything. So my settings.xml ended up containing:

  <profiles>
    <profile>
      <id>nexus</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <repositories>
        <repository>
          <id>maven-releases</id>
          <url>http://myhost.com/nexus/content/repositories/releases</url>
          <layout>default</layout>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>false</enabled>
          </snapshots>
        </repository>
        <repository>
          <id>maven-snapshots</id>
          <url>http://myhost.com/nexus/content/repositories/snapshots</url>
          <layout>default</layout>
          <releases>
            <enabled>false</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </repository>        
        <repository>
          <id>madeUp</id>
          <url>http://central</url>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>madeUp</id>
          <url>http://central</url>
          <releases>
            <enabled>true</enabled>
          </releases>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>

  <mirrors>
    <mirror>
      <id>nexus</id>
      <mirrorOf>madeUp</mirrorOf>
      <url>http://myhost.com/nexus/content/groups/public</url>
    </mirror>
  </mirrors>