java.util.ConcurrentModificationException
   at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
   at java.util.ArrayList$Itr.next(ArrayList.java:851)
   at org.netbeans.modules.autoupdate.ui.UnitCategoryTableModel.getVisibleUnits(UnitCategoryTableModel.java:310)
   at org.netbeans.modules.autoupdate.ui.UnitCategoryTableModel.getVisibleUnits(UnitCategoryTableModel.java:305)
   at org.netbeans.modules.autoupdate.ui.UnitCategoryTableModel.getRowCount(UnitCategoryTableModel.java:326)
   at javax.swing.table.TableRowSorter$TableRowSorterModelWrapper.getRowCount(TableRowSorter.java:265)
   at javax.swing.DefaultRowSorter.convertRowIndexToModel(DefaultRowSorter.java:513)
   at javax.swing.JTable.convertRowIndexToModel(JTable.java:2642)
   at org.netbeans.modules.autoupdate.ui.UnitTab$SourceCategoryRenderer.getTableCellRendererComponent(UnitTab.java:2360)
   at javax.swing.JTable.prepareRenderer(JTable.java:5723)
   at org.netbeans.modules.autoupdate.ui.UnitTable.prepareRenderer(UnitTable.java:153)
   at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2114)
   at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:2016)
   at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1812)
   at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161)
   at javax.swing.JComponent.paintComponent(JComponent.java:780)
   at javax.swing.JComponent.paint(JComponent.java:1056)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JViewport.paint(JViewport.java:728)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1047)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintChildren(JComponent.java:889)
   at javax.swing.JComponent.paint(JComponent.java:1065)
   at javax.swing.JComponent.paintToOffscreen(JComponent.java:5219)
   at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1572)
   at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1495)
   at javax.swing.RepaintManager.paint(RepaintManager.java:1265)
   at javax.swing.JComponent._paintImmediately(JComponent.java:5167)
   at javax.swing.JComponent.paintImmediately(JComponent.java:4978)
   at javax.swing.RepaintManager$4.run(RepaintManager.java:824)
   at javax.swing.RepaintManager$4.run(RepaintManager.java:807)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:807)
   at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:782)
   at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:731)
   at javax.swing.RepaintManager.access$1300(RepaintManager.java:64)
   at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1720)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)