NullPointerException異常的ZK API的Range.insert生成Excel文件（JExcel/Apache的POI）

青睞的朋友，這裏是她的查詢：NullPointerException異常的ZK API的Range.insert生成Excel文件（JExcel/Apache的POI）

Hi! I am currently using jexcelapi to create excel files and then I read them using zk spreadsheet. I tried the code found in the documentation for inserting columns and shifting cells to the right but unfortunately, a null pointer exception shows up whenever I try to insert/shift cells. I also tried uploading the excel files I created using jexcelapi to the zssapp (just to be sure) but a null pointer also shows up. But when I try to read excel files created by MS Excel, it works fine. Has anyone encountered this problem before? Any help would greatly be appreciated. PS: I also tried using POI to create files. I also encounter a null pointer exception.

以下是錯誤：

java.lang.NullPointerException 
at org.zkoss.poi.hssf.record.XFExtRecord.cloneXFExtFrom(XFExtRecord.java:91) 
at org.zkoss.poi.hssf.usermodel.HSSFCellStyle.cloneStyleFrom(HSSFCellStyle.java:835) 
at org.zkoss.poi.hssf.usermodel.HSSFCellStyle.cloneStyleFrom(HSSFCellStyle.java:825) 
at org.zkoss.zss.model.impl.BookHelper.copyFromStyleExceptBorder(BookHelper.java:3308) 
at org.zkoss.zss.model.impl.HSSFSheetImpl.shiftColumnsRange(HSSFSheetImpl.java:601) 
at org.zkoss.zss.model.impl.BookHelper.insertHSSFRange(BookHelper.java:1942) 
at org.zkoss.zss.model.impl.BookHelper.insertRange(BookHelper.java:1931) 
at org.zkoss.zss.model.impl.RangeImpl.insert(RangeImpl.java:649) 
at data.InitWindow.onClick$shiftCellRight(InitWindow.java:102) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
at java.lang.reflect.Method.invoke(Unknown Source) 
at org.zkoss.zk.ui.event.GenericEventListener.onEvent(GenericEventListener.java:81) 
at org.zkoss.zk.ui.impl.EventProcessor.process0(EventProcessor.java:192) 
at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138) 
at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:305) 
at org.zkoss.zk.ui.event.Events.sendEvent(Events.java:328) 
at org.zkoss.zk.ui.AbstractComponent$ForwardListener.onEvent(AbstractComponent.java:3022) 
at org.zkoss.zk.ui.impl.EventProcessor.process0(EventProcessor.java:192) 
at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138) 
at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1603) 
at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1387) 
at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1107) 
at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:563) 
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:457) 
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:465) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) 
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
at java.lang.Thread.run(Unknown Source)

And here is the code I use to create files. What I do here is create an excel file whenever a form is created:

public void createExcel(Integer formID, String loc){ 
    try { 
     File path = new File(loc); 
     if (!path.exists()) { 
      boolean status = path.mkdirs(); 
     } 
     String filename = loc + formID +".xls"; 
     WorkbookSettings ws = new WorkbookSettings(); 
     ws.setLocale(new Locale("en", "EN")); 
     WritableWorkbook workbook; 
     workbook = Workbook.createWorkbook(new File(filename), ws); 
     workbook.createSheet("Sheet1", 0); 
     workbook.write(); 
     workbook.close(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } catch (WriteException e) { 
     e.printStackTrace(); 
    } 
}

從我發現，她使用gwt框架作爲使用zk類的橋樑。

此查詢的原始帖子可以在這裏找到：http://www.zkoss.org/forum/listComment/15683

非常感謝你們！

來源

2011-03-28 eunique0216

這個異常有**的根本原因**嗎？ – 2011-03-28 16:48:40

你有機會嘗試使用Apache POI 3.8 beta 1，然後發佈堆棧跟蹤？（我不認爲你應該得到一個，但我需要看到特定的POI能夠幫助那裏） – Gagravarr 2011-04-03 18:08:30

這裏是產生錯誤：

public void onClick$insertCol() { 
    int tRow = currSheet.getFirstRowNum(); 
    int bRow = currSheet.getPhysicalNumberOfRows(); 
    Ranges.range(currSheet, tRow, colIndex, bRow, colIndex).insert(Range.SHIFT_RIGHT, Range.FORMAT_RIGHTBELOW); 
}

錯誤也表明了，如果我移動單元格的權利。

來源

2011-03-28 17:24:36 charmeleon

NullPointerException異常的ZK API的Range.insert生成Excel文件（JExcel/Apache的POI）

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