title: Maven: How to install a plugin in offline mode
body: <p>I'm sitting behind a firewall and therefore maven can't connect to central repositories (error message is given below).</p>
  
  <p>However, I can connect to the internet via HTTP.</p>
  
  <p>How can I install a maven plugin (e. g. archetype) in offline mode (i. e. download some file in a browser and then install the plugin by executing some commands) ?</p>
  
  <p>Thanks in advance</p>
  
  <p>Dmitri</p>
  
  <p>P. S.: Here is the error message:</p>
  
  <pre><code>E:\&gt;mvn archetype:generate -DarchetypeGroupId=com.vaadin
   -DarchetypeArtifactId=vaadin-archetype-clean -DarchetypeVersion=LATEST -DgroupI
  d=at.swdev -DartifactId=pcc -Dversion=1.0 -Dpackaging=war
  [INFO] Scanning for projects...
  [INFO] Searching repository for plugin with prefix: 'archetype'.
  [INFO] org.apache.maven.plugins: checking for updates from central
  [WARNING] repository metadata for: 'org.apache.maven.plugins' could not be retri
  eved from repository: central due to an error: Error transferring file: Connecti
  on refused: connect
  [INFO] Repository 'central' will be blacklisted
  [INFO] ------------------------------------------------------------------------
  [ERROR] BUILD ERROR
  [INFO] ------------------------------------------------------------------------
  [INFO] The plugin 'org.apache.maven.plugins:maven-archetype-plugin' does not exi
  st or no valid version could be found
  [INFO] ------------------------------------------------------------------------
  [INFO] For more information, run Maven with the -e switch
  [INFO] ------------------------------------------------------------------------
  [INFO] Total time: 1 second
  [INFO] Finished at: Thu Jul 22 15:17:00 CEST 2010
  [INFO] Final Memory: 1M/15M
  [INFO] ------------------------------------------------------------------------
  </code></pre>