java.lang.NullPointerException: Cannot invoke "java.lang.Integer.intValue()" because the return value of "java.util.Map.get(Object)" is null
	at org.zkoss.zk.ui.HtmlShadowElement.binarySearchSubTree(HtmlShadowElement.java:965)
	at org.zkoss.zk.ui.HtmlShadowElement.binarySearchSubTree(HtmlShadowElement.java:979)
	at org.zkoss.zk.ui.HtmlShadowElement.queryIntersectedShadowIfAny(HtmlShadowElement.java:894)
	at org.zkoss.zk.ui.HtmlShadowElement.beforeHostChildAdded(HtmlShadowElement.java:1038)
	at org.zkoss.zk.ui.AbstractComponent.triggerBeforeHostChildAdded(AbstractComponent.java:4151)
	at org.zkoss.zk.ui.AbstractComponent.insertBefore(AbstractComponent.java:1363)
	at org.zkoss.zk.ui.impl.AbstractUiFactory.newComponent(AbstractUiFactory.java:144)
	at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:930)
	at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:900)
	at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:787)
	at org.zkoss.zk.ui.impl.UiEngineImpl$TemplateImpl.create(UiEngineImpl.java:2397)
	at org.zkoss.zuti.zul.ForEachRenderer.render(ForEachRenderer.java:88)
	at org.zkoss.zuti.zul.ForEachListDataListener.renderModelData(ForEachListDataListener.java:128)
	at org.zkoss.zuti.zul.ForEachListDataListener.onListModelDataChange(ForEachListDataListener.java:74)
	at org.zkoss.zuti.zul.ForEachListDataListener.onChange(ForEachListDataListener.java:46)
	at org.zkoss.zul.AbstractListModel.fireEvent(AbstractListModel.java:77)
	at org.zkoss.zul.ListModelList.add(ListModelList.java:164)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at bsh.Reflect.invokeMethod(Reflect.java:131)
	at bsh.Reflect.invokeObjectMethod(Reflect.java:77)
	at bsh.Name.invokeMethod(Name.java:852)
	at bsh.BSHMethodInvocation.eval(BSHMethodInvocation.java:69)
	at bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:96)
	at bsh.BSHPrimaryExpression.eval(BSHPrimaryExpression.java:41)
	at bsh.Interpreter.eval(Interpreter.java:659)
	at bsh.Interpreter.eval(Interpreter.java:750)
	at org.zkoss.zk.scripting.bsh.BSHInterpreter.exec(BSHInterpreter.java:132)
	at org.zkoss.zk.scripting.util.GenericInterpreter.interpret(GenericInterpreter.java:343)
	at org.zkoss.zk.ui.impl.PageImpl.interpret(PageImpl.java:969)
	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3129)
	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3083)
	at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138)
	at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1902)
	at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1674)
	at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1332)
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:535)
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:408)
	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:416)

bbb
ccc
aaa