java.lang.IllegalArgumentException: Comparison method violates its general contract!
   at java.util.TimSort.mergeHi(TimSort.java:868)
   at java.util.TimSort.mergeAt(TimSort.java:485)
   at java.util.TimSort.mergeForceCollapse(TimSort.java:426)
   at java.util.TimSort.sort(TimSort.java:223)
   at java.util.TimSort.sort(TimSort.java:173)
   at java.util.Arrays.sort(Arrays.java:659)
   at java.util.Collections.sort(Collections.java:217)
   at org.netbeans.modules.properties.BundleStructure.sort(BundleStructure.java:534)
   at org.netbeans.modules.properties.PropertiesTableModel.setValueAt(PropertiesTableModel.java:214)
   at javax.swing.JTable.setValueAt(JTable.java:2744)
   at javax.swing.JTable.editingStopped(JTable.java:4726)
   at javax.swing.AbstractCellEditor.fireEditingStopped(AbstractCellEditor.java:141)
   at javax.swing.DefaultCellEditor$EditorDelegate.stopCellEditing(DefaultCellEditor.java:368)
   at javax.swing.DefaultCellEditor.stopCellEditing(DefaultCellEditor.java:233)
   at org.netbeans.modules.properties.BundleEditPanel.saveEditorValue(BundleEditPanel.java:295)
   at org.netbeans.modules.properties.BundleEditPanel.stopEditing(BundleEditPanel.java:283)
   at org.netbeans.modules.properties.BundleEditPanel.addButtonActionPerformed(BundleEditPanel.java:653)
   at org.netbeans.modules.properties.BundleEditPanel.access$1000(BundleEditPanel.java:76)
   at org.netbeans.modules.properties.BundleEditPanel$8.actionPerformed(BundleEditPanel.java:542)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
   at java.awt.Component.processMouseEvent(Component.java:6504)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
   at java.awt.Component.processEvent(Component.java:6269)
   at java.awt.Container.processEvent(Container.java:2229)
   at java.awt.Component.dispatchEventImpl(Component.java:4860)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4686)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4832)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4492)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4422)
   at java.awt.Container.dispatchEventImpl(Container.java:2273)
   at java.awt.Window.dispatchEventImpl(Window.java:2713)
   at java.awt.Component.dispatchEvent(Component.java:4686)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
   at java.awt.EventQueue.access$000(EventQueue.java:101)
   at java.awt.EventQueue$3.run(EventQueue.java:666)
   at java.awt.EventQueue$3.run(EventQueue.java:664)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
   at java.awt.EventQueue$4.run(EventQueue.java:680)
   at java.awt.EventQueue$4.run(EventQueue.java:678)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:162)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)