java.lang.NullPointerException
        at javax.swing.ScrollPaneLayout.preferredLayoutSize(ScrollPaneLayout.java:494)
        at java.awt.Container.preferredSize(Container.java:1669)
        at java.awt.Container.getPreferredSize(Container.java:1654)
        at javax.swing.JComponent.getPreferredSize(JComponent.java:1645)
        at org.netbeans.modules.editor.hints.borrowed.ScrollCompletionPane.<init>(ScrollCompletionPane.java:104)
        at org.netbeans.modules.editor.hints.HintsUI.showPopup(HintsUI.java:347)
        at org.netbeans.modules.editor.hints.HintsUI.invokeDefaultAction(HintsUI.java:484)
        at org.netbeans.modules.editor.hints.HintsUI.keyPressed(HintsUI.java:512)
        at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:250)
        at java.awt.Component.processKeyEvent(Component.java:6057)
        at javax.swing.JComponent.processKeyEvent(JComponent.java:2810)
        at java.awt.Component.processEvent(Component.java:5876)
        at java.awt.Container.processEvent(Container.java:2109)
        at java.awt.Component.dispatchEventImpl(Component.java:4460)
        at java.awt.Container.dispatchEventImpl(Container.java:2167)
        at java.awt.Component.dispatchEvent(Component.java:4286)
        at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1879)
        at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:742)
        at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1007)
        at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:879)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:706)
        at java.awt.Component.dispatchEventImpl(Component.java:4330)
        at java.awt.Container.dispatchEventImpl(Container.java:2167)
        at java.awt.Window.dispatchEventImpl(Window.java:2554)
        at java.awt.Component.dispatchEvent(Component.java:4286)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:604)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)