title: Performance graphs on Jenkins causing "Could not initialize class org.jfree.chart.JFreeChart" exceptions
body: <p>When <strong>Jenkins</strong> tries to generate the <strong>Performance Trends graphs</strong> there launches several exceptions always with root cause: "<strong><code>java.lang.NoClassDefFoundError: Could not initialize class org.jfree.chart.JFreeChart</code></strong>"</p>
  
  <p>This is what I did:</p>
  
  <ul>
  <li>desployed Jenkins , tried with <strong>v1.532.2</strong> (<em>stable</em>) and also with <strong>v1.539-SNAPSHOT</strong></li>
  <li><ul>
  <li>didn't configured security</li>
  </ul></li>
  <li><ul>
  <li>just set paths to my JDK (oracle's jdk1.7.0_51), MAVEN (3.1.1) and GIT (1.8.1.2)</li>
  </ul></li>
  <li>enabled these plugins:</li>
  <li><ul>
  <li>Checkstyle v3.39</li>
  </ul></li>
  <li><ul>
  <li>Jenkins Cobertura v1.9.3</li>
  </ul></li>
  <li><ul>
  <li>FindBugs v4.51</li>
  </ul></li>
  <li><ul>
  <li>Warnings v4.39</li>
  </ul></li>
  <li><ul>
  <li>PMD v3.38</li>
  </ul></li>
  <li><ul>
  <li>Performance v.1.10</li>
  </ul></li>
  <li><ul>
  <li>Jenkins Git client v1.6.2</li>
  </ul></li>
  <li><ul>
  <li>Jenkins Git 2.0.1</li>
  </ul></li>
  </ul>
  
  <p>Then I created a project which successfully <strong>creates a JMeter report file</strong> from my Java webapp using the plugin <strong>jmeter-maven-plugin v1.9.0</strong>, but there doesn't appear the Performance Trend graphs on the project's page. Jenkins really gathers the results because it shows me the response times, but can't show me the graphs. There launches several Exceptions always with <strong>root cause</strong>: "<strong><code>java.lang.NoClassDefFoundError: Could not initialize class org.jfree.chart.JFreeChart</code></strong>" . Here you will find a complete StackTrace: <a href="http://pastebin.com/uhiNR7XD" rel="noreferrer">http://pastebin.com/uhiNR7XD</a></p>
  
  <p>Jenkins already has <strong>jcommon-1.0.12.jar</strong> and <strong>jfreechart-1.0.9.jar</strong> at it's <strong><code>/WEB-INF/lib/</code></strong> . <a href="https://stackoverflow.com/questions/18307126/could-not-initialize-class-org-jfree-chart-jfreechart">This other post</a> doesn't apply.</p>
  
  <p>Can you help me, please?</p>
  
  <p>Thanks in advance!</p>
  
  <p>/ Angel</p>