title: Log4j java.lang.NoClassDefFoundError
body: <p>I couldnt understand what is causing this error:</p>
  
  <pre><code>ERROR&gt;Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/PropertyConfigurator
  
  ERROR&gt;Caused by: java.lang.ClassNotFoundException: org.apache.log4j.PropertyConfigurator
  </code></pre>
  
  <p>Already got the <code>log4j-1.2.8.jar</code> everywhere in the project but I couldnt make it. How can I make this error go away? Thanks!</p>