java.util.ConcurrentModificationException
	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
	at java.util.AbstractList$Itr.next(AbstractList.java:420)
	at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
	at org.netbeans.modules.xml.wsdl.ui.view.grapheditor.widget.CollaborationsWidget$3.actionPerformed(CollaborationsWidget.java:175)
	at org.netbeans.modules.xml.wsdl.ui.view.grapheditor.widget.ButtonWidget.fireActionPerformed(ButtonWidget.java:187)
	at org.netbeans.modules.xml.wsdl.ui.view.grapheditor.widget.ButtonWidget.mouseReleased(ButtonWidget.java:226)
	at org.netbeans.modules.xml.wsdl.ui.view.grapheditor.widget.ButtonAction.mouseReleased(ButtonAction.java:64)
	at org.netbeans.api.visual.action.WidgetAction$Chain.mouseReleased(WidgetAction.java:768)
	at org.netbeans.api.visual.widget.SceneComponent$Operator$3.operate(SceneComponent.java:492)
	at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:270)
	at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:262)
	at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:262)
	at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:262)
	at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:262)
	at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:262)
	at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:262)
	at org.netbeans.api.visual.widget.SceneComponent.processLocationOperator(SceneComponent.java:232)
	at org.netbeans.api.visual.widget.SceneComponent.mouseReleased(SceneComponent.java:127)
	at java.awt.Component.processMouseEvent(Component.java:5501)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
	at java.awt.Component.processEvent(Component.java:5266)
	at java.awt.Container.processEvent(Container.java:1966)
	at java.awt.Component.dispatchEventImpl(Component.java:3968)
	at java.awt.Container.dispatchEventImpl(Container.java:2024)
	at java.awt.Component.dispatchEvent(Component.java:3803)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
	at java.awt.Container.dispatchEventImpl(Container.java:2010)
	at java.awt.Window.dispatchEventImpl(Window.java:1778)
	at java.awt.Component.dispatchEvent(Component.java:3803)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)