title: How to set the JGoodies Look and Feel?
body: <p>I added the <code>jgoodies-looks-2.5.3.jar</code> to my buildpath and started it with</p>
  
  <pre><code>public static void main(String[] args) {
          EventQueue.invokeLater(new Runnable() {
              public void run() {
                  try {
                      UIManager.setLookAndFeel("com.jgoodies.looks.windows.WindowsLookAndFeel");
                      ExpenseManagerGUI frame = new ExpenseManagerGUI();
                  } catch (Exception e) {
                      e.printStackTrace();
                  }
              }
          });
      }
  </code></pre>
  
  <p>But I get the following Error: (How to fix this?)</p>
  
  <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: com/jgoodies/common/base/SystemUtils
      at com.jgoodies.looks.common.ShadowPopupFactory.install(ShadowPopupFactory.java:116)
      at com.jgoodies.looks.windows.WindowsLookAndFeel.initialize(WindowsLookAndFeel.java:199)
      at javax.swing.UIManager.setLookAndFeel(Unknown Source)
      at javax.swing.UIManager.setLookAndFeel(Unknown Source)
      at de.mayerhofersimon.expensemanager.ExpenseManagerGUI$2.run(ExpenseManagerGUI.java:94)
      at java.awt.event.InvocationEvent.dispatch(Unknown Source)
      at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
      at java.awt.EventQueue.access$200(Unknown Source)
      at java.awt.EventQueue$3.run(Unknown Source)
      at java.awt.EventQueue$3.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
      at java.awt.EventQueue.dispatchEvent(Unknown Source)
      at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
      at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
      at java.awt.EventDispatchThread.run(Unknown Source)
  Caused by: java.lang.ClassNotFoundException: com.jgoodies.common.base.SystemUtils
      at java.net.URLClassLoader$1.run(Unknown Source)
      at java.net.URLClassLoader$1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      ... 19 more
  </code></pre>