SQL Developer  Version 1.5.1 Build MAIN-5440 Imported Connections missing

I have a problem using SQL Developer Version 1.5.1 Build MAIN-5440. I have successfully imported connections from my previous version of SQL Developer. After I restart, all the connections I have imported has been gone. I tried to import the connections but got an error message:
java.lang.NullPointerException
     at oracle.jdeveloper.db.DatabaseConnections.getReferenceable(DatabaseConnections.java:695)
     at oracle.jdeveloper.db.DatabaseConnections.addConnection(DatabaseConnections.java:762)
     at oracle.dbtools.raptor.connections.ConnectionGrinder.doImportExport(ConnectionGrinder.java:243)
     at oracle.dbtools.raptor.connections.ConnectionGrinder.invoke(ConnectionGrinder.java:117)
     at oracle.dbtools.raptor.navigator.DatabaseNavigatorController.handleEvent(DatabaseNavigatorController.java:200)
     at oracle.ide.controller.IdeAction.performAction(IdeAction.java:524)
     at oracle.ide.controller.IdeAction.actionPerformedImpl(IdeAction.java:855)
     at oracle.ide.controller.IdeAction.actionPerformed(IdeAction.java:496)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
     at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
     at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1000)
     at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1041)
     at java.awt.Component.processMouseEvent(Component.java:5488)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
     at java.awt.Component.processEvent(Component.java:5253)
     at java.awt.Container.processEvent(Container.java:1966)
     at java.awt.Component.dispatchEventImpl(Component.java:3955)
     at java.awt.Container.dispatchEventImpl(Container.java:2024)
     at java.awt.Component.dispatchEvent(Component.java:3803)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
     at java.awt.Container.dispatchEventImpl(Container.java:2010)
     at java.awt.Window.dispatchEventImpl(Window.java:1774)
     at java.awt.Component.dispatchEvent(Component.java:3803)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
I tried to create a new connections. I can test the newly created connections but cannot save it.

This bug was fixed in SqlDev 2.1.1. You'll find this build on our homepage.
-Raghu

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