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java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) at java.util.AbstractList$Itr.next(AbstractList.java:343) at java.util.AbstractList.hashCode(AbstractList.java:526) at org.zkoss.zul.ListModelList.hashCode(ListModelList.java:219) at java.util.WeakHashMap.get(WeakHashMap.java:348) at org.zkoss.bind.tracker.impl.TrackerImpl$EqualBeansMap.getEqualBeans(TrackerImpl.java:522) at org.zkoss.bind.tracker.impl.TrackerImpl.getAllTrackerNodesByBean0(TrackerImpl.java:405) at org.zkoss.bind.tracker.impl.TrackerImpl.getAllTrackerNodesByBean(TrackerImpl.java:400) at org.zkoss.bind.tracker.impl.TrackerImpl.tieValue(TrackerImpl.java:203) at org.zkoss.bind.xel.zel.BindELResolver.tieValue(BindELResolver.java:155) at org.zkoss.bind.xel.zel.BindELResolver.getValue(BindELResolver.java:83) at org.zkoss.zel.impl.parser.AstValue.getValue(AstValue.java:179) at org.zkoss.zel.impl.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189) at org.zkoss.xel.zel.ELXelExpression.evaluate(ELXelExpression.java:40) at org.zkoss.bind.impl.BindEvaluatorXImpl.getValue(BindEvaluatorXImpl.java:42) at org.zkoss.bind.impl.ReferenceBindingImpl.load(ReferenceBindingImpl.java:68) at org.zkoss.bind.impl.ReferenceBindingImpl.getValue(ReferenceBindingImpl.java:44) at org.zkoss.bind.xel.zel.BindELResolver.getValue(BindELResolver.java:79) at org.zkoss.zel.impl.parser.AstIdentifier.getValue(AstIdentifier.java:75) at org.zkoss.zel.impl.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189) at org.zkoss.xel.zel.ELXelExpression.evaluate(ELXelExpression.java:40) at org.zkoss.bind.impl.BindEvaluatorXImpl.getValue(BindEvaluatorXImpl.java:42) at org.zkoss.bind.impl.LoadPropertyBindingImpl.load(LoadPropertyBindingImpl.java:58) at org.zkoss.bind.impl.PropertyBindingHandler.doLoadBinding(PropertyBindingHandler.java:171) at org.zkoss.bind.impl.PropertyBindingHandler.doLoad(PropertyBindingHandler.java:372) at org.zkoss.bind.impl.BinderImpl.loadComponentProperties(BinderImpl.java:1865) at org.zkoss.bind.impl.BinderImpl.loadComponent(BinderImpl.java:1847) at org.zkoss.bind.tracker.impl.BindUiLifeCycle$1.onEvent(BindUiLifeCycle.java:63) at org.zkoss.zk.ui.AbstractComponent.onEvent(AbstractComponent.java:2736) at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2685) at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2648) at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:136) at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:308) at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:331) at org.zkoss.bind.impl.BindComboitemRenderer.render(BindComboitemRenderer.java:116) at org.zkoss.zul.Combobox$Renderer.render(Combobox.java:450) at org.zkoss.zul.Combobox$Renderer.access$300(Combobox.java:433) at org.zkoss.zul.Combobox.onInitRender(Combobox.java:350) at sun.reflect.GeneratedMethodAccessor2191.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597)