title: Invalid value of sonar.sources for project:myproject with org.sonarsource.scanner.maven
body: <p>When i try to launch sonar on jenkins i have the following error :</p>
  
  <pre><code>Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.0.2:sonar (default-cli) on project project.pom: 
  The folder '/path/to/file/project.core/pom.xml' does not exist for 'project:project.core' 
  (base directory = /path/to/folder/project.core) -&gt; [Help 1] 
  </code></pre>
  
  <p>I think it's because sonarsource is seeking for a folder and the path locates a pom.xml file but i dont understand why. </p>
  
  <p>My maven project have the following file tree :</p>
  
  <pre><code>project.pom
     pom.xml
     project.core
        pom.xml
     project.backend
        pom.xml
    ....
  </code></pre>
  
  <p>Edit : root pom.xml</p>
  
  <pre><code>   &lt;?xml version="1.0"?&gt;
  &lt;project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt;
    &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
    &lt;groupId&gt;project&lt;/groupId&gt;
    &lt;artifactId&gt;project.pom&lt;/artifactId&gt;
    &lt;version&gt;X.Y.Z&lt;/version&gt;
    &lt;packaging&gt;pom&lt;/packaging&gt;
    &lt;name&gt;My project&lt;/name&gt;
    &lt;description&gt;My project&lt;/description&gt;
    &lt;prerequisites&gt;
      &lt;maven&gt;${maven.version.min}&lt;/maven&gt;
    &lt;/prerequisites&gt;
    &lt;modules&gt;
      &lt;module&gt;project.core&lt;/module&gt;
      &lt;module&gt;project.backend&lt;/module&gt;
    &lt;/modules&gt;
    &lt;distributionManagement&gt;
      &lt;repository&gt;
        //repositories
      &lt;/repository&gt;
      &lt;snapshotRepository&gt;
        //repositories
      &lt;/snapshotRepository&gt;
    &lt;/distributionManagement&gt;
    &lt;dependencyManagement&gt;
      &lt;dependencies&gt;
        &lt;dependency&gt;
          &lt;groupId&gt;project&lt;/groupId&gt;
          &lt;artifactId&gt;project.core&lt;/artifactId&gt;
          &lt;version&gt;${project.version}&lt;/version&gt;
        &lt;/dependency&gt;
        &lt;dependency&gt;
          &lt;groupId&gt;project&lt;/groupId&gt;
          &lt;artifactId&gt;project.backend&lt;/artifactId&gt;
          &lt;version&gt;${project.version}&lt;/version&gt;
        &lt;/dependency&gt;
    &lt;/dependencyManagement&gt;
    &lt;build&gt;
      &lt;pluginManagement&gt;
        &lt;plugins&gt;
          &lt;plugin&gt;
            &lt;groupId&gt;org.sonarsource.scanner.maven&lt;/groupId&gt;
            &lt;artifactId&gt;sonar-maven-plugin&lt;/artifactId&gt;
            &lt;version&gt;3.0.2&lt;/version&gt;
          &lt;/plugin&gt;
          &lt;plugin&gt;
            &lt;groupId&gt;org.codehaus.mojo&lt;/groupId&gt;
            &lt;artifactId&gt;exec-maven-plugin&lt;/artifactId&gt;
            &lt;version&gt;1.3&lt;/version&gt;
          &lt;/plugin&gt;
          &lt;plugin&gt;
            &lt;artifactId&gt;maven-jar-plugin&lt;/artifactId&gt;
            &lt;configuration&gt;
              &lt;archive&gt;
                &lt;manifest&gt;
                  &lt;addDefaultImplementationEntries&gt;true&lt;/addDefaultImplementationEntries&gt;
                  &lt;addDefaultSpecificationEntries&gt;true&lt;/addDefaultSpecificationEntries&gt;
                &lt;/manifest&gt;
              &lt;/archive&gt;
            &lt;/configuration&gt;
          &lt;/plugin&gt;
        &lt;/plugins&gt;
      &lt;/pluginManagement&gt;
    &lt;/build&gt;
  &lt;/project&gt;
  </code></pre>