title: Jdeveloper error "java.lang.NoClassDefFoundError: Could not initialize class oracle.dbtools.raptor.config.DBConfig" on start
body: <p>I use Jdeveloper Studio 11.1.1.4.0, I use the ADF components on it, but for the last couple of days when I start the Jdeveloper, this Error comes up</p>
  
  <pre class="lang-none prettyprint-override"><code>Uncaught exception
  java.lang.NoClassDefFoundError: Could not initialize class oracle.dbtools.raptor.config.DBConfig
  o.dbtools.raptor.oviewer.base.NavSelectionListener.viewSelectionChanged(NavSelectionListener.java:176)
  o.i.view.View.fireViewSelectionChangedImpl(View.java:495)
  o.i.view.ViewDecorator.fireViewSelectionChangedImpl(ViewDecorator.java:59)
  o.i.view.View.fireViewSelectionChanged(View.java:485)
  o.i.view.View.updateSelectionImpl0(View.java:444)
  o.i.view.View.updateSelectionImpl(View.java:429)
  o.i.view.View.updateSelection(View.java:306)
  o.ideri.navigator.DefaultNavigatorWindow$4.viewSelectionChanged(DefaultNavigatorWindow.java:1108)
  o.i.view.View.fireViewSelectionChangedImpl(View.java:495)
  o.i.view.View.fireViewSelectionChanged(View.java:485)
  o.i.view.View$2.actionPerformed(View.java:349)
  jx.s.Timer.fireActionPerformed(Timer.java:271)
  jx.s.Timer$DoPostEvent.run(Timer.java:201)
  j.a.event.InvocationEvent.dispatch(InvocationEvent.java:209)
  j.a.EventQueue.dispatchEvent(EventQueue.java:597)
  j.a.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
  j.a.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
  j.a.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
  j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
  j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
  j.a.EventDispatchThread.run(EventDispatchThread.java:122)
  </code></pre>
  
  <p>I can't find the Database Navigator either and also this error also comes up when I use anything related to the database, I tried to uninstall the Jdeveloper and removed the middleware folder and reinstall everything to get the default but still same story.</p>
  
  <p>I really need a fix for this ASAP because I'm already behind schedule on my graduation project.</p>
  
  <p>Thanks.</p>