java.lang.NullPointerException
   at java.util.LinkedList.addAll(LinkedList.java:406)
   at java.util.LinkedList.addAll(LinkedList.java:385)
   at de.sugaryourcoffee.person.model.PersonChildrenFactory.createKeys(PersonChildrenFactory.java:33)
   at org.openide.nodes.SynchChildren.refresh(SynchChildren.java:86)
   at org.openide.nodes.SynchChildren.addNotify(SynchChildren.java:70)
   at org.openide.nodes.Children.callAddNotify(Children.java:575)
   at org.openide.nodes.EntrySupport$Default.getArray(EntrySupport.java:770)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:172)
   at org.openide.nodes.EntrySupport$Default.getNodes(EntrySupport.java:228)
   at org.openide.nodes.EntrySupport$Default.getNodesCount(EntrySupport.java:232)
   at org.openide.nodes.Children.getNodesCount(Children.java:509)
   at org.openide.explorer.view.VisualizerNode.getChildren(VisualizerNode.java:258)
   at org.openide.explorer.view.VisualizerNode.getChildren(VisualizerNode.java:248)
   at org.openide.explorer.view.VisualizerNode.getChildCount(VisualizerNode.java:325)
   at javax.swing.tree.DefaultTreeModel.getChildCount(DefaultTreeModel.java:186)
   at org.netbeans.swing.outline.DefaultOutlineModel.getChildCount(DefaultOutlineModel.java:236)
   at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1478)
   at javax.swing.tree.VariableHeightLayoutCache$TreeStateNode.expand(VariableHeightLayoutCache.java:1287)
   at javax.swing.tree.VariableHeightLayoutCache.rebuild(VariableHeightLayoutCache.java:742)
   at javax.swing.tree.VariableHeightLayoutCache.treeStructureChanged(VariableHeightLayoutCache.java:643)
   at org.netbeans.swing.outline.EventBroadcaster.treeStructureChanged(EventBroadcaster.java:409)
   at javax.swing.tree.DefaultTreeModel.fireTreeStructureChanged(DefaultTreeModel.java:580)
   at javax.swing.tree.DefaultTreeModel.nodeStructureChanged(DefaultTreeModel.java:365)
   at javax.swing.tree.DefaultTreeModel.setRoot(DefaultTreeModel.java:135)
   at org.openide.explorer.view.NodeTreeModel$1.run(NodeTreeModel.java:122)
   at org.openide.util.Mutex.doEvent(Mutex.java:1341)
   at org.openide.util.Mutex.readAccess(Mutex.java:348)
   at org.openide.explorer.view.NodeTreeModel.setNode(NodeTreeModel.java:107)
   at org.openide.explorer.view.NodeTreeModel.setNode(NodeTreeModel.java:103)
   at org.openide.explorer.view.OutlineView.synchronizeRootContext(OutlineView.java:728)
   at org.openide.explorer.view.OutlineView.lookupExplorerManager(OutlineView.java:714)
   at org.openide.explorer.view.OutlineView.addNotify(OutlineView.java:647)
   at java.awt.Container.addNotify(Container.java:2769)
   at javax.swing.JComponent.addNotify(JComponent.java:4734)
   at java.awt.Container.addNotify(Container.java:2769)
   at javax.swing.JComponent.addNotify(JComponent.java:4734)
   at java.awt.Container.addNotify(Container.java:2769)
   at javax.swing.JComponent.addNotify(JComponent.java:4734)
   at java.awt.Container.addNotify(Container.java:2769)
   at org.netbeans.modules.form.fakepeer.FakePeerContainer.addNotify(FakePeerContainer.java:65)
   at java.awt.Container.addNotify(Container.java:2769)
   at javax.swing.JComponent.addNotify(JComponent.java:4734)
   at java.awt.Container.addNotify(Container.java:2769)
   at javax.swing.JComponent.addNotify(JComponent.java:4734)
   at java.awt.Container.addNotify(Container.java:2769)
   at javax.swing.JComponent.addNotify(JComponent.java:4734)
   at java.awt.Container.addNotify(Container.java:2769)
   at javax.swing.JComponent.addNotify(JComponent.java:4734)
   at java.awt.Container.addNotify(Container.java:2769)
   at javax.swing.JComponent.addNotify(JComponent.java:4734)
   at java.awt.Container.addNotify(Container.java:2769)
   at javax.swing.JComponent.addNotify(JComponent.java:4734)
   at java.awt.Container.addImpl(Container.java:1114)
   at java.awt.Container.add(Container.java:410)
   at org.netbeans.modules.nbform.FormDesignerTC.guiInit(FormDesignerTC.java:236)
   at org.netbeans.modules.nbform.FormDesignerTC.loadForm(FormDesignerTC.java:277)
   at org.netbeans.modules.nbform.FormDesignerTC.access$300(FormDesignerTC.java:86)
   at org.netbeans.modules.nbform.FormDesignerTC$PreLoadTask$1.run(FormDesignerTC.java:263)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
   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.awt.EventQueue.dispatchEvent(EventQueue.java:675)
   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)