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java.util.ConcurrentModificationException at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:373) at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:392) at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:391) at org.zkoss.util.CacheMap.expunge(CacheMap.java:228) at org.zkoss.util.CacheMap.doExpunge(CacheMap.java:208) at org.zkoss.util.CacheMap.tryExpunge(CacheMap.java:202) at org.zkoss.util.CacheMap.get(CacheMap.java:391) at org.zkoss.poi.ss.format.CellNumberFormatter.getFormatter(CellNumberFormatter.java:112) at org.zkoss.poi.ss.format.CellFormat$1.apply(CellFormat.java:119) at org.zkoss.zss.model.impl.sys.FormatEngineImpl.format0(FormatEngineImpl.java:94) at org.zkoss.zss.model.impl.sys.FormatEngineImpl.format(FormatEngineImpl.java:62) at org.zkoss.zss.ui.impl.CellFormatHelper.getInnerHtmlStyle(CellFormatHelper.java:323) at org.zkoss.zss.ui.Spreadsheet$ExtraCtrl.getCellAttr(Spreadsheet.java:3290) at org.zkoss.zss.ui.Spreadsheet$ExtraCtrl.getRangeAttrs(Spreadsheet.java:3144) at org.zkoss.zss.ui.Spreadsheet.responseUpdateCell(Spreadsheet.java:2778) at org.zkoss.zss.ui.Spreadsheet.updateCell(Spreadsheet.java:2747) at org.zkoss.zss.ui.Spreadsheet.access$4000(Spreadsheet.java:213) at org.zkoss.zss.ui.Spreadsheet$InnerModelEventDispatcher.onCellContentChange(Spreadsheet.java:2346) at org.zkoss.zss.ui.Spreadsheet$InnerModelEventDispatcher.access$1200(Spreadsheet.java:2058) at org.zkoss.zss.ui.Spreadsheet$InnerModelEventDispatcher$7.onEvent(Spreadsheet.java:2102) at org.zkoss.zss.ui.ModelEventDispatcher.onEvent(ModelEventDispatcher.java:49) at org.zkoss.zss.model.impl.EventQueueListenerAdaptor$WrappedListener.onEvent(EventQueueListenerAdaptor.java:105) at org.zkoss.zk.ui.event.impl.DesktopEventQueue$QueueListener.onEvent(DesktopEventQueue.java:152) at org.zkoss.zk.ui.AbstractComponent.onEvent(AbstractComponent.java:2746) at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2717) at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2658) at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:136) at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1765) at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1550) at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1260) at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:603) at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:485) at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:494) at javax.servlet.http.HttpServlet.service(HttpServlet.java:646) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2442) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2431) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:662)