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.getViewRowCount(DefaultRowSorter.java:815)
   at javax.swing.JTable.getRowCount(JTable.java:2660)
   at javax.swing.JTable.getCellRect(JTable.java:2932)
   at javax.swing.plaf.basic.BasicTableUI.createTableSize(BasicTableUI.java:1694)
   at javax.swing.plaf.basic.BasicTableUI.getPreferredSize(BasicTableUI.java:1733)
   at javax.swing.JComponent.getPreferredSize(JComponent.java:1662)
   at javax.swing.JTable.setWidthsFromPreferredWidths(JTable.java:3214)
   at javax.swing.JTable.doLayout(JTable.java:3128)
   at java.awt.Container.validateTree(Container.java:1693)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validate(Container.java:1628)
   at javax.swing.RepaintManager$3.run(RepaintManager.java:704)
   at javax.swing.RepaintManager$3.run(RepaintManager.java:702)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:701)
   at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1719)
   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)