title: Maven error - resolving dependencies
body: <p>I'm not very familiar with maven and I'm struggling with this error message when running a maven compile:</p>
  
  <pre><code>[ERROR] Failed to execute goal on project myProject: Could not resolve dependencies for project myProject:1.0: Failure to find weka:weka:jar:3.7.1-beta in http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -&gt; [Help 1]
  </code></pre>
  
  <p>The pom looks like this:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &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;groupId&gt;myGroup&lt;/groupId&gt;
      &lt;artifactId&gt;myProject&lt;/artifactId&gt;
      &lt;version&gt;1.1&lt;/version&gt;
  
      &lt;repositories&gt;
          &lt;repository&gt;
              &lt;id&gt;ambit-plovdiv&lt;/id&gt;
              &lt;url&gt;
                  http://ambit.uni-plovdiv.bg:8083/nexus/content/repositories/thirdparty&lt;/url&gt;
              &lt;snapshots&gt;
                  &lt;enabled&gt;false&lt;/enabled&gt;
              &lt;/snapshots&gt;
          &lt;/repository&gt;
      &lt;/repositories&gt;
  
  
      &lt;dependencies&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;junit&lt;/groupId&gt;
              &lt;artifactId&gt;junit&lt;/artifactId&gt;
              &lt;version&gt;4.7&lt;/version&gt;
              &lt;scope&gt;test&lt;/scope&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;commons-collections&lt;/groupId&gt;
              &lt;artifactId&gt;commons-collections&lt;/artifactId&gt;
              &lt;version&gt;3.2.1&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;!-- general purpose math-libraries --&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.apache.commons&lt;/groupId&gt;
              &lt;artifactId&gt;commons-math&lt;/artifactId&gt;
              &lt;version&gt;2.2&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;commons-lang&lt;/groupId&gt;
              &lt;artifactId&gt;commons-lang&lt;/artifactId&gt;
              &lt;version&gt;2.4&lt;/version&gt;
          &lt;/dependency&gt;
  
  
          &lt;dependency&gt;
              &lt;groupId&gt;net.sf.opencsv&lt;/groupId&gt;
              &lt;artifactId&gt;opencsv&lt;/artifactId&gt;
              &lt;version&gt;2.1&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;net.sourceforge.jtds&lt;/groupId&gt;
              &lt;artifactId&gt;jtds&lt;/artifactId&gt;
              &lt;version&gt;1.2.4&lt;/version&gt;
          &lt;/dependency&gt;
  
  
          &lt;dependency&gt;
              &lt;groupId&gt;net.sourceforge.jexcelapi&lt;/groupId&gt;
              &lt;artifactId&gt;jxl&lt;/artifactId&gt;
              &lt;version&gt;2.6.10&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;tablelayout&lt;/groupId&gt;
              &lt;artifactId&gt;TableLayout&lt;/artifactId&gt;
              &lt;version&gt;20050920&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;org.openscience.cdk&lt;/groupId&gt;
              &lt;artifactId&gt;cdk&lt;/artifactId&gt;
              &lt;version&gt;1.3.8&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;org.openscience.cdk&lt;/groupId&gt;
              &lt;artifactId&gt;jchempaint&lt;/artifactId&gt;
              &lt;version&gt;3.0.1&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;org.apache.poi&lt;/groupId&gt;
              &lt;artifactId&gt;poi&lt;/artifactId&gt;
              &lt;version&gt;3.7-beta1&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;org.apache.poi&lt;/groupId&gt;
              &lt;artifactId&gt;poi-ooxml-schemas&lt;/artifactId&gt;
              &lt;version&gt;3.7-beta1&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;org.apache.poi&lt;/groupId&gt;
              &lt;artifactId&gt;poi-ooxml&lt;/artifactId&gt;
              &lt;version&gt;3.7-beta1&lt;/version&gt;
          &lt;/dependency&gt;
  
      &lt;/dependencies&gt;
  
      &lt;build&gt;
          &lt;plugins&gt;
              &lt;plugin&gt;
                  &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
                  &lt;version&gt;2.0.2&lt;/version&gt;
                  &lt;configuration&gt;
                      &lt;source&gt;1.6&lt;/source&gt;
                      &lt;target&gt;1.6&lt;/target&gt;
                      &lt;optimize&gt;true&lt;/optimize&gt;
  
                      &lt;fork&gt;true&lt;/fork&gt;
                      &lt;compilerVersion&gt;1.6&lt;/compilerVersion&gt;
  
                      &lt;encoding&gt;UTF-8&lt;/encoding&gt;
                  &lt;/configuration&gt;
              &lt;/plugin&gt;
          &lt;/plugins&gt;
      &lt;/build&gt;
  
      &lt;properties&gt;
          &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt;
      &lt;/properties&gt;
  &lt;/project&gt;
  </code></pre>
  
  <p>Can anybody help to understand this error message?</p>