EA1: Adding file types does not work.

The File Type preferences panel doesn't seem to work.
1 Go into Preferences
2 Click on File Types in the tree
3 CLick Add, enter an extension and click on OK
You get the stack dump below in the console.
The extension you just entered goes in a 'DeployableTextNode' with a tick in the Open with SQL Developer column.
But the check box in the bottom panel is Unchecked and all the other fields in bottom panel are disabled (Remove button; File Type drop down; Content Type Radio group).
4 Click on OK
5 Go back into Preferences | File Type.
The first time I did this, the extension I just added was gone.
Going through it again for this post, they are all gone, including the pre-supplied ones.
6 Exit SQL Developer and go back in and they are back.
java.lang.NullPointerException
        at oracle.ide.config.DocumentExtensionsPanel._addButton_actionPerformed(DocumentExtensionsPanel.java:8
        at oracle.ide.config.DocumentExtensionsPanel.mav$_addButton_actionPerformed(DocumentExtensionsPanel.ja
        at oracle.ide.config.DocumentExtensionsPanel$2.actionPerformed(DocumentExtensionsPanel.java:376)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
        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.pumpEventsForHierarchy(EventDispatchThread.java:153)
        at java.awt.Dialog$1.run(Dialog.java:515)
        at java.awt.Dialog.show(Dialog.java:536)
        at java.awt.Component.show(Component.java:1300)
        at java.awt.Component.setVisible(Component.java:1253)
        at oracle.bali.ewt.dialog.JEWTDialog.runDialog(Unknown Source)
        at oracle.bali.ewt.dialog.JEWTDialog.runDialog(Unknown Source)
        at oracle.ide.dialogs.WizardLauncher.runDialog(WizardLauncher.java:55)
        at oracle.ide.panels.TDialogLauncher.showDialog(TDialogLauncher.java:225)
        at oracle.ide.config.IdeSettings.showDialog(IdeSettings.java:808)
        at oracle.ide.config.IdeSettings.showDialog(IdeSettings.java:593)
        at oracle.ide.cmd.IdeSettingsCommand.doit(IdeSettingsCommand.java:45)
        at oracle.ide.controller.CommandProcessor.invoke(CommandProcessor.java:309)
        at oracle.ide.controller.IdeAction.performAction(IdeAction.java:536)
        at oracle.ide.controller.IdeAction.actionPerformedImpl(IdeAction.java:843)
        at oracle.ide.controller.IdeAction.actionPerformed(IdeAction.java:486)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
        at javax.swing.AbstractButton$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 notice the line numbers of the first to lines of the dump have been truncated. Here are the first two lines again.
at oracle.ide.config.DocumentExtensionsPanel._addButton_actionPerformed(DocumentExtensionsPanel.java:885)
at oracle.ide.config.DocumentExtensionsPanel.mav$_addButton_actionPerformed(DocumentExtensionsPanel.java:96)

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