java.lang.NullPointerException at sun.swing.table.DefaultTableCellHeaderRenderer.getColumnSortOrder(DefaultTableCellHeaderRenderer.java:104) at com.sun.java.swing.plaf.windows.WindowsTableHeaderUI$XPDefaultRenderer.getTableCellRendererComponent(WindowsTableHeaderUI.java:108) at org.openide.explorer.view.TableSheetCell.getTableCellRendererComponent(TableSheetCell.java:280) at org.openide.explorer.view.TreeTableView$SortingHeaderRenderer.getTableCellRendererComponent(TreeTableView.java:1589) at javax.swing.plaf.basic.BasicTableHeaderUI.getHeaderRenderer(BasicTableHeaderUI.java:663) at javax.swing.plaf.basic.BasicTableHeaderUI.getHeaderHeight(BasicTableHeaderUI.java:698) at javax.swing.plaf.basic.BasicTableHeaderUI.createHeaderSize(BasicTableHeaderUI.java:727) at javax.swing.plaf.basic.BasicTableHeaderUI.getPreferredSize(BasicTableHeaderUI.java:758) at javax.swing.JComponent.getPreferredSize(JComponent.java:1632) at org.openide.explorer.view.TreeTable$TreeTableHeader.getPreferredSize(TreeTable.java:869) at javax.swing.ViewportLayout.preferredLayoutSize(ViewportLayout.java:78) at java.awt.Container.preferredSize(Container.java:1616) at java.awt.Container.getPreferredSize(Container.java:1601) at javax.swing.JComponent.getPreferredSize(JComponent.java:1634) at javax.swing.ScrollPaneLayout.preferredLayoutSize(ScrollPaneLayout.java:507) at java.awt.Container.preferredSize(Container.java:1616) at java.awt.Container.getPreferredSize(Container.java:1601) at javax.swing.JComponent.getPreferredSize(JComponent.java:1634) at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:702) at java.awt.Container.preferredSize(Container.java:1616) at java.awt.Container.getPreferredSize(Container.java:1601) at javax.swing.JComponent.getPreferredSize(JComponent.java:1634) at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:769) at java.awt.Container.layout(Container.java:1432) at java.awt.Container.doLayout(Container.java:1421) at java.awt.Container.validateTree(Container.java:1519) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validate(Container.java:1491) at org.netbeans.core.windows.view.ui.DesktopImpl$LayeredLayout.layoutContainer(DesktopImpl.java:431) at java.awt.Container.layout(Container.java:1432) at java.awt.Container.doLayout(Container.java:1421) at java.awt.Container.validateTree(Container.java:1519) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validateTree(Container.java:1526) at java.awt.Container.validate(Container.java:1491) at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:635) at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:127) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160) at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)