Nexus: Could not find artifact

Question

Recently I've migrated from Archiva to Sonatype Nexus.

I'm trying to use Jars from 3rd party repositories and Nexus does not cache it into the local repository.

I've searched for answers in this section and couldn't one that answers the question.

Here is what I did...

I'm using settings.xml :

<settings>
  <mirrors>
    <mirror>
      <!--This sends everything else to /public -->
      <id>nexus</id>
      <mirrorOf>*</mirrorOf>
      <url>http://THE_URL:8080/nexus/content/groups/public</url>
    </mirror>
  </mirrors>
  <servers>
    <server>
      <id>admin</id>
      <username>user</username>
      <password>password</password>
    </server>
  </servers>
  <profiles>
    <profile>
      <id>nexus</id>
      <!--Enable snapshots for the built in central repo to direct -->
      <!--all requests to nexus via the mirror -->
      <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>
  <activeProfiles>
    <!--make the profile active all the time -->
    <activeProfile>nexus</activeProfile>
  </activeProfiles>

</settings>

I've also created proxy repositories for all the 3rd party repositories I'm using, and ADDED THEM TO THE NEXUS PUBLIC GROUP.

Next, I've run the command:

mvn clean install

and got the following error:

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building shlang 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: http://THE_URL:8080/nexus/content/groups/public/com/shadow/shadow/1/shadow-1.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.341s
[INFO] Finished at: Sun Jun 30 11:59:42 IDT 2013
[INFO] Final Memory: 6M/120M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project shlang: Could not resolve dependencies for project com.shadow:shlang:jar:1.0-SNAPSHOT: Failed to collect dependencies for [couchbase:couchbase-client:jar:1.1.5 (compile), com.google.code.gson:gson:pom:2.2.2 (compile), org.json:json:jar:20090211 (compile), net.sf.json-lib:json-lib:jar:jdk15:2.4 (compile), jline:jline:jar:2.10 (compile), commons-validator:commons-validator:jar:1.4.0 (compile), spy:spymemcached:jar:2.8.1 (compile), com.shadow:util:jar:1.0.1 (compile), com.shadow:monkey_schoolyard:jar:1.0.0 (compile)]: Failed to read artifact descriptor for com.shadow:util:jar:1.0.1: Could not find artifact com.shadow:shadow:pom:1 in nexus (http://THE_URL:8080/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 result in the local repo is that it does not contained any of the 3rd party jars it should.

What do I miss here?

Answer 1

Most likely your local Maven repository has the fact that the component can not be found cached. You can force Maven to check for updates of snapshot versions and existence of previously not found version with the -U flag.

So run

mvn clean install -U

Sometimes if thing are really weird it can help to completely delete the respective folder structure in your local repository. So in your example

rm -rf ~/.m2/repository/com/shadow/