>>org.apache.xmlbeans.impl.values.XmlValueDisconnectedException
>>	at org.apache.xmlbeans.impl.values.XmlObjectBase.check_orphaned(XmlObjectBase.java:1213)
>>	at org.openxmlformats.schemas.spreadsheetml.x2006.main.impl.CTXfImpl.getXfId(Unknown Source)
>>	at org.zkoss.poi.xssf.model.StylesTable.getStyleAt(StylesTable.java:249)
>>	at org.zkoss.poi.xssf.usermodel.XSSFCell.getCellStyle(XSSFCell.java:489)
>>	at org.zkoss.poi.xssf.usermodel.XSSFCell.getCellStyle(XSSFCell.java:1)
>>	at org.zkoss.zss.ui.impl.CellFormatHelper.processRightBorder(CellFormatHelper.java:230)
>>	at org.zkoss.zss.ui.impl.CellFormatHelper.getHtmlStyle(CellFormatHelper.java:100)
>>	at org.zkoss.zss.ui.Spreadsheet$ExtraCtrl.getCellAttr(Spreadsheet.java:3115)
>>	at org.zkoss.zss.ui.Spreadsheet$ExtraCtrl.getRangeAttrs(Spreadsheet.java:2974)
>>	at org.zkoss.zss.ui.Spreadsheet.responseUpdateCell(Spreadsheet.java:2610)
>>	at org.zkoss.zss.ui.Spreadsheet.updateCell(Spreadsheet.java:2558)
>>	at org.zkoss.zss.ui.Spreadsheet.access$13(Spreadsheet.java:2507)
>>	at org.zkoss.zss.ui.Spreadsheet$InnerDataListener.onContentChange(Spreadsheet.java:2259)
>>	at org.zkoss.zss.ui.Spreadsheet$InnerDataListener.access$6(Spreadsheet.java:2244)
>>	at org.zkoss.zss.ui.Spreadsheet$InnerDataListener$7.onEvent(Spreadsheet.java:2000)
>>	at org.zkoss.zss.engine.event.EventDispatchListener.onEvent(EventDispatchListener.java:43)
>>	at org.zkoss.zssex.engine.impl.RefBookImpl$DelegateListener.onEvent(RefBookImpl.java:117)
>>	at org.zkoss.zk.ui.event.impl.DesktopEventQueue$QueueListener.onEvent(DesktopEventQueue.java:150)
>>	at org.zkoss.zk.ui.AbstractComponent.onEvent(AbstractComponent.java:2748)
>>	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2719)
>>	at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2660)
>>	at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:136)
>>	at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1720)
>>	at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1505)
>>	at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1215)
>>	at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:600)
>>	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:482)
>>	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:491)
>>	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
>>	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>>	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
>>	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)
>>	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>>	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
>>	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
>>	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
>>	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
>>	at org.mortbay.jetty.Server.handle(Server.java:326)
>>	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
>>	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
>>	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
>>	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
>>	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
>>	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
>>	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)