java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.dbtools.raptor.controls.ConnectionPanelUI.listConnections(ConnectionPanelUI.java:435)
at oracle.dbtools.raptor.controls.ConnectionPanelUI.resetConnections(ConnectionPanelUI.java:448)
at oracle.dbtools.raptor.controls.ConnectionPanelUI.(ConnectionPanelUI.java:123)
at oracle.dbtools.raptor.controls.ConnectionPanelUI.(ConnectionPanelUI.java:101)
at oracle.dbtools.raptor.controls.ConnectionSelectorUI.(ConnectionSelectorUI.java:29)
at oracle.dbtools.raptor.controls.ConnectionSelectorUI.getConnection(ConnectionSelectorUI.java:60)
at oracle.dbtools.raptor.controls.ConnectionSelectorUI.getConnection(ConnectionSelectorUI.java:37)
at oracle.dbtools.worksheet.editor.OpenWorksheetWizard.invoke(OpenWorksheetWizard.java:279)
at oracle.ide.wizard.WizardManager.invokeWizard(WizardManager.java:372)
at oracle.dbtools.worksheet.editor.WorksheetOpenController$1.run(WorksheetOpenController.java:67)
at oracle.dbtools.worksheet.editor.WorksheetOpenController.openWorksheetWizard(WorksheetOpenController.java:73)
at oracle.dbtools.worksheet.editor.WorksheetOpenController.handleEvent(WorksheetOpenController.java:34)
at oracle.ideimpl.controller.IdeActionHook$MetaClassController.handleEvent(IdeActionHook.java:414)
at oracle.ide.controller.IdeAction.performAction(IdeAction.java:531)
at oracle.ide.controller.IdeAction.actionPerformedImpl(IdeAction.java:886)
at oracle.ide.controller.IdeAction.actionPerformed(IdeAction.java:503)
at oracle.ide.controls.ActionMenuToolButton.access$400(ActionMenuToolButton.java:82)
at oracle.ide.controls.ActionMenuToolButton$FilterActionEvents.actionPerformed(ActionMenuToolButton.java:394)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at oracle.ide.controls.ActionMenuToolButton$2.setPressed(ActionMenuToolButton.java:223)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:273)
at java.awt.Component.processMouseEvent(Component.java:6134)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5899)
at java.awt.Container.processEvent(Container.java:2023)
at java.awt.Component.dispatchEventImpl(Component.java:4501)
at java.awt.Container.dispatchEventImpl(Container.java:2081)
at java.awt.Component.dispatchEvent(Component.java:4331)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4301)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3965)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3895)
at java.awt.Container.dispatchEventImpl(Container.java:2067)
at java.awt.Window.dispatchEventImpl(Window.java:2458)
at java.awt.Component.dispatchEvent(Component.java:4331)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

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