java.lang.NullPointerException
   at org.netbeans.modules.xml.wsdl.ui.view.treeeditor.PartnerLinkTypeNode.createAlwaysPresentAttributeProperty(PartnerLinkTypeNode.java:76)
   at org.netbeans.modules.xml.wsdl.ui.view.treeeditor.WSDLElementNode.refreshAttributesSheetSet(WSDLElementNode.java:721)
   at org.netbeans.modules.xml.wsdl.ui.view.treeeditor.ExtensibilityElementNode.refreshAttributesSheetSet(ExtensibilityElementNode.java:390)
   at org.netbeans.modules.xml.wsdl.ui.view.treeeditor.WSDLElementNode.refreshSheet(WSDLElementNode.java:664)
   at org.netbeans.modules.xml.wsdl.ui.view.treeeditor.WSDLElementNode.createSheet(WSDLElementNode.java:654)
   at org.openide.nodes.AbstractNode.getSheet(AbstractNode.java:441)
   at org.netbeans.modules.xml.wsdl.ui.view.treeeditor.WSDLElementNode.propertyChange(WSDLElementNode.java:567)
   at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:196)
   at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
   at org.netbeans.modules.xml.xam.AbstractModel$Transaction.fireCompleteEventSet(AbstractModel.java:557)
   at org.netbeans.modules.xml.xam.AbstractModel$Transaction.fireEvents(AbstractModel.java:543)
   at org.netbeans.modules.xml.xam.AbstractModel.endTransaction(AbstractModel.java:366)
   at org.netbeans.modules.xml.xam.AbstractModel.endTransaction(AbstractModel.java:357)
   at org.netbeans.modules.xml.wsdl.ui.view.grapheditor.widget.CollaborationsWidget$1.actionPerformed(CollaborationsWidget.java:202)
   at org.netbeans.modules.xml.wsdl.ui.view.grapheditor.widget.ButtonWidget.fireActionPerformed(ButtonWidget.java:221)
   at org.netbeans.modules.xml.wsdl.ui.view.grapheditor.widget.ButtonWidget.mouseReleased(ButtonWidget.java:263)
   at org.netbeans.modules.xml.wsdl.ui.view.grapheditor.widget.ButtonAction.mouseReleased(ButtonAction.java:94)
   at org.netbeans.api.visual.action.WidgetAction$Chain.mouseReleased(WidgetAction.java:793)
   at org.netbeans.api.visual.widget.SceneComponent$Operator$3.operate(SceneComponent.java:564)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:335)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:327)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:327)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:327)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:327)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:327)
   at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:290)
   at org.netbeans.api.visual.widget.SceneComponent.mouseReleased(SceneComponent.java:166)
   at java.awt.Component.processMouseEvent(Component.java:6505)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
   at java.awt.Component.processEvent(Component.java:6270)
   at java.awt.Container.processEvent(Container.java:2229)
   at java.awt.Component.dispatchEventImpl(Component.java:4861)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   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:2719)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:703)
   at java.awt.EventQueue.access$000(EventQueue.java:102)
   at java.awt.EventQueue$3.run(EventQueue.java:662)
   at java.awt.EventQueue$3.run(EventQueue.java:660)
   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:676)
   at java.awt.EventQueue$4.run(EventQueue.java:674)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:673)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)