title: Maven: Could not resolve dependencies (artifact not found)
body: <p>I'm trying to build <a href="https://github.com/andsel/moquette" rel="nofollow">moquette</a> using maven, being a complete newbie to Maven tough.</p>
  
  <p>I'm using the following command to build.</p>
  
  <blockquote>
    <p>mvn clean install -U</p>
  </blockquote>
  
  <p>And</p>
  
  <blockquote>
    <p>mvn clean install -U | grep ERROR</p>
  </blockquote>
  
  <p>Results in the following:</p>
  
  <pre><code>[ERROR] Failed to execute goal on project moquette-broker: Could not resolve dependencies for project org.eclipse.moquette:moquette-broker:jar:0.7-SNAPSHOT: Could not find artifact org.mapdb:mapdb:jar:1.1.0-SNAPSHOT in Paho Releases (https://repo.eclipse.org/content/repositories/paho-releases/) -&gt; [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
  [ERROR] 
  [ERROR] After correcting the problems, you can resume the build with the command
  [ERROR]   mvn &lt;goals&gt; -rf :moquette-broker
  </code></pre>
  
  <p>The full output of:</p>
  
  <blockquote>
    <p>mvn clean install -e -X -U</p>
  </blockquote>
  
  <p>Can be found <a href="http://pastebin.com/2XhxPcDA" rel="nofollow">here</a>.</p>
  
  <p>My <em>pom.xml</em> looks like:</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt;
      &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
      &lt;properties&gt;
          &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt;
          &lt;netty.version&gt;4.0.24.Final&lt;/netty.version&gt;
          &lt;source.version&gt;1.7&lt;/source.version&gt;
          &lt;target.version&gt;1.7&lt;/target.version&gt;
      &lt;/properties&gt;
  
      &lt;groupId&gt;org.eclipse.moquette&lt;/groupId&gt;
      &lt;artifactId&gt;moquette-parent&lt;/artifactId&gt;
  
      &lt;packaging&gt;pom&lt;/packaging&gt;
      &lt;version&gt;0.7-SNAPSHOT&lt;/version&gt;
      &lt;name&gt;Moquette MQTT parent&lt;/name&gt;
      &lt;url&gt;http://code.google.com/p/moquette-mqtt/&lt;/url&gt;
  
  
      &lt;modules&gt;
          &lt;module&gt;parser_commons&lt;/module&gt;
          &lt;module&gt;netty_parser&lt;/module&gt;
          &lt;module&gt;broker&lt;/module&gt;
          &lt;module&gt;distribution&lt;/module&gt;
          &lt;module&gt;bundle&lt;/module&gt;
      &lt;/modules&gt;
  
      &lt;reporting&gt;
          &lt;plugins&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.codehaus.mojo&lt;/groupId&gt;
                  &lt;artifactId&gt;cobertura-maven-plugin&lt;/artifactId&gt;
                  &lt;version&gt;2.6&lt;/version&gt;
              &lt;/plugin&gt;
          &lt;/plugins&gt;
      &lt;/reporting&gt;
  
      &lt;build&gt;
          &lt;plugins&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
                  &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
                  &lt;configuration&gt;
                      &lt;source&gt;${source.version}&lt;/source&gt;
                      &lt;target&gt;${target.version}&lt;/target&gt;
                  &lt;/configuration&gt;
              &lt;/plugin&gt;
          &lt;/plugins&gt;
      &lt;/build&gt;
  &lt;/project&gt;
  </code></pre>
  
  <p>What is causing this problem and how do I fix this?</p>