我使用的是Jdeveloper Studio 11.1.1.4.0，其中包含ADF组件。但是最近几天每次启动Jdeveloper时都会出现以下错误：
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)
我找不到Database Navigator，无论何时使用与数据库相关的内容都会出现这个错误。我尝试卸载Jdeveloper并删除middleware文件夹，然后重新安装以获取默认设置，但仍然出现同样的情况。我需要尽快解决这个问题，因为我已经在我的毕业项目上落后了进度。谢谢。