title: JUnit categories with multi module project - Unable to load category
body: <p>I want to include/exclude JUnit categorized tests. I have a marker interface <code>StressTest</code> defined in a common module. I am referencing <code>StressTest</code> in moduleA. I have the following maven-surefire-plugin in root <code>pom.xml</code></p>
  
  <pre><code>&lt;plugin&gt;
  &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
  &lt;artifactId&gt;maven-surefire-plugin&lt;/artifactId&gt;
  &lt;version&gt;2.20&lt;/version&gt;
  &lt;configuration&gt;
    &lt;excludedGroups&gt;com.mycompany.project.common.utils.StressTest&lt;/excludedGroups&gt;
  &lt;/configuration&gt;
  &lt;/plugin&gt;
  </code></pre>
  
  <p>When running mvn test I get the following while building another module.</p>
  
  <pre><code>Unable to load category: com.mycompany.project.common.utils.StressTest
  </code></pre>
  
  <p>Where should I write my <code>StressTest</code> interface?</p>