JDev 11.1.2.4.0 Can't Open Unbounded Task Flow

I just created a new Fusion application. When I click on the unbounded task flow adfc-config.xml I get an error dialog box An unexpected severe error has occured in JDeveloper.
It seems that same issue as in that discussion https://forums.oracle.com/thread/2565042?start=0&tstart=0 except that I am not using mobile extension. I can't downgrade JDev to JDK 1.6. I use 1.7.0_25. Any workaround?
Stack Trace:
Failed to create an instance of editor oracle.adfdt.controller.adfc.diagram.editor.AdfcDiagramEditor
java.lang.reflect.InvocationTargetException
  sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
  sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  j.lang.reflect.Constructor.newInstance(Constructor.java:526)
  o.ii.editor.EditorState.createEditor(EditorState.java:154)
  o.ii.editor.EditorState.getOrCreateEditor(EditorState.java:102)
  o.ii.editor.SplitPaneState.canSetEditorStatePos(SplitPaneState.java:251)
  o.ii.editor.SplitPaneState.setCurrentEditorStatePos(SplitPaneState.java:214)
  o.ii.editor.TabGroupState.createSplitPaneState(TabGroupState.java:105)
  o.ii.editor.TabGroup.addTabGroupState(TabGroup.java:394)
  o.ii.editor.EditorManagerImpl.createEditor(EditorManagerImpl.java:786)
  o.ii.editor.EditorManagerImpl.createEditor(EditorManagerImpl.java:720)
  o.ii.editor.EditorManagerImpl.openEditor(EditorManagerImpl.java:637)
  o.ii.navigator.OpenEditorController.whenOpenEditor(OpenEditorController.java:41)
  o.ii.navigator.OpenEditorContextMenuListener.handleDefaultAction(OpenEditorContextMenuListener.java:51)
  o.i.controller.ContextMenuListenersHook$LazyContextMenuListener.handleDefaultAction(ContextMenuListenersHook.java:219)
  o.i.controller.ContextMenu.fireDefaultAction(ContextMenu.java:447)
  o.ii.explorer.BaseTreeExplorer.fireDefaultAction(BaseTreeExplorer.java:1900)
  o.ii.explorer.BaseTreeExplorer.dblClicked(BaseTreeExplorer.java:2249)
  o.ii.explorer.BaseTreeExplorer.mouseReleased(BaseTreeExplorer.java:2278)
  o.ii.explorer.CustomTree.processMouseEvent(CustomTree.java:211)
  j.a.Component.processEvent(Component.java:6270)
  j.a.Container.processEvent(Container.java:2229)
  j.a.Component.dispatchEventImpl(Component.java:4861)
  j.a.Container.dispatchEventImpl(Container.java:2287)
  j.a.Component.dispatchEvent(Component.java:4687)
  j.a.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
  j.a.LightweightDispatcher.processMouseEvent(Container.java:4492)
  j.a.LightweightDispatcher.dispatchEvent(Container.java:4422)
  j.a.Container.dispatchEventImpl(Container.java:2273)
  j.a.Window.dispatchEventImpl(Window.java:2719)
  j.a.Component.dispatchEvent(Component.java:4687)
  j.a.EventQueue.dispatchEventImpl(EventQueue.java:735)
  j.a.EventQueue.access$200(EventQueue.java:103)
  j.a.EventQueue$3.run(EventQueue.java:694)
  j.a.EventQueue$3.run(EventQueue.java:692)
  j.security.AccessController.doPrivileged(Native Method)
  j.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  j.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
  j.a.EventQueue$4.run(EventQueue.java:708)
  j.a.EventQueue$4.run(EventQueue.java:706)
  j.security.AccessController.doPrivileged(Native Method)
  j.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  j.a.EventQueue.dispatchEvent(EventQueue.java:705)
  o.javatools.internal.ui.EventQueueWrapper._dispatchEvent(EventQueueWrapper.java:169)
  o.javatools.internal.ui.EventQueueWrapper.dispatchEvent(EventQueueWrapper.java:151)
  j.a.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
  j.a.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
  j.a.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
  j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
  j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
  j.a.EventDispatchThread.run(EventDispatchThread.java:91)
Caused by:
java.lang.NoClassDefFoundError: Could not initialize class oracle.diagram.framework.action.Actions
  o.diagram.framework.action.handler.ZoomInHandler.<clinit>(ZoomInHandler.java:22)
  o.diagram.framework.editor.CommonDiagram.<clinit>(CommonDiagram.java:100)
  o.adfdt.controller.adfc.diagram.editor.AdfcDiagramEditor.<init>(AdfcDiagramEditor.java:17)
  sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
  sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  j.lang.reflect.Constructor.newInstance(Constructor.java:526)
  o.ii.editor.EditorState.createEditor(EditorState.java:154)
  o.ii.editor.EditorState.getOrCreateEditor(EditorState.java:102)
  o.ii.editor.SplitPaneState.canSetEditorStatePos(SplitPaneState.java:251)
  o.ii.editor.SplitPaneState.setCurrentEditorStatePos(SplitPaneState.java:214)
  o.ii.editor.TabGroupState.createSplitPaneState(TabGroupState.java:105)
  o.ii.editor.TabGroup.addTabGroupState(TabGroup.java:394)
  o.ii.editor.EditorManagerImpl.createEditor(EditorManagerImpl.java:786)
  o.ii.editor.EditorManagerImpl.createEditor(EditorManagerImpl.java:720)
  o.ii.editor.EditorManagerImpl.openEditor(EditorManagerImpl.java:637)
  o.ii.navigator.OpenEditorController.whenOpenEditor(OpenEditorController.java:41)
  o.ii.navigator.OpenEditorContextMenuListener.handleDefaultAction(OpenEditorContextMenuListener.java:51)
  o.i.controller.ContextMenuListenersHook$LazyContextMenuListener.handleDefaultAction(ContextMenuListenersHook.java:219)
  o.i.controller.ContextMenu.fireDefaultAction(ContextMenu.java:447)
  o.ii.explorer.BaseTreeExplorer.fireDefaultAction(BaseTreeExplorer.java:1900)
  o.ii.explorer.BaseTreeExplorer.dblClicked(BaseTreeExplorer.java:2249)
  o.ii.explorer.BaseTreeExplorer.mouseReleased(BaseTreeExplorer.java:2278)
  o.ii.explorer.CustomTree.processMouseEvent(CustomTree.java:211)
  j.a.Component.processEvent(Component.java:6270)
  j.a.Container.processEvent(Container.java:2229)
  j.a.Component.dispatchEventImpl(Component.java:4861)
  j.a.Container.dispatchEventImpl(Container.java:2287)
  j.a.Component.dispatchEvent(Component.java:4687)
  j.a.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
  j.a.LightweightDispatcher.processMouseEvent(Container.java:4492)
  j.a.LightweightDispatcher.dispatchEvent(Container.java:4422)
  j.a.Container.dispatchEventImpl(Container.java:2273)
  j.a.Window.dispatchEventImpl(Window.java:2719)
  j.a.Component.dispatchEvent(Component.java:4687)
  j.a.EventQueue.dispatchEventImpl(EventQueue.java:735)
  j.a.EventQueue.access$200(EventQueue.java:103)
  j.a.EventQueue$3.run(EventQueue.java:694)
  j.a.EventQueue$3.run(EventQueue.java:692)
  j.security.AccessController.doPrivileged(Native Method)
  j.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  j.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
  j.a.EventQueue$4.run(EventQueue.java:708)
  j.a.EventQueue$4.run(EventQueue.java:706)
  j.security.AccessController.doPrivileged(Native Method)
  j.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  j.a.EventQueue.dispatchEvent(EventQueue.java:705)
  o.javatools.internal.ui.EventQueueWrapper._dispatchEvent(EventQueueWrapper.java:169)
  o.javatools.internal.ui.EventQueueWrapper.dispatchEvent(EventQueueWrapper.java:151)
  j.a.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
  j.a.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
  j.a.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
  j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
  j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
  j.a.EventDispatchThread.run(EventDispatchThread.java:91)

No, there is no workaround for this.  You can open a SR and let Oracle work on this. We can't do anything about it.
Why can't you install jdk 1.6?
You can have more then one jdk installed on your pc.
You can use in jdk which comes with the installation package,
Timo

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