Java POI the supplied data appears to be in the Office 2007+ XML

Question

I am getting this error:

org.apache.poi.poifs.filesystem.OfficeXmlFileException: The supplied data appears to be in the Office 2007+ XML. You are calling the part of POI that deals with OLE2 Office Documents. You need to call a different part of POI to process this data (e.g. XSSF instead of HSSF)

I read throw Google and I found out that I need to use XSSF instead of HSSF because my Excel file is xlsx, but as you see in my maven, I am already using xlsx. Where have I gone wrong please?

<dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml</artifactId>
        <version>3.13-beta1</version>
    </dependency> 

The code the makes the exception is:

POIFSFileSystem fs;

            fs = new POIFSFileSystem(new FileInputStream(getFilePath()));

My new code

public void getBColum() {
    try {
        OPCPackage fs;

        fs = new OPCPackage.open(new File(getFilePath()));

        XSSFWorkbook wb = new XSSFWorkbook(fs);
        XSSFSheet sheet = wb.getSheet("Master column name - Used Car");
        XSSFRow row;
        CellReference cr = new CellReference("A1");
        row = sheet.getRow(cr.getCol());
        System.out.println(row.getCell(3));
    } catch (FileNotFoundException e) {
        if (logger.isDebugEnabled()) {
            logger.debug("How can this error be possible? we should have already thrown an exception in the construction");
        }
    } catch (IOException e) {
        logger.error(String.format("Exception in reading the file: %s",
                e.getMessage()));
    }
}

I have a compile error in new oPCPackage.open which is:

OPCPackage.open cannot be resolved to a type

Answer 1

According to the Apache POI Quick Guide, the POIFSFileSystem (or similarly, NPOIFSFileSystem) is only used with .xls (Excel versions through 2003) documents.

The equivalent for .xlsx documents (Excel 2007+) is OPCPackage.

OPCPackage pkg = OPCPackage.open(new File("file.xlsx"));

You can create an XSSFWorkbook from the OPCPackage:

XSSFWorkbook wb = new XSSFWorkbook(pkg);

Or you can just create it directly:

XSSFWorkbook wb = new XSSFWorkbook(new File("file.xlsx"));

Generally it's better to create the workbook using a File instead of an InputStream, to save memory.

Also, if you want code that doesn't care whether it's an .xls or an .xlsx:

// or "file.xlsx"
Workbook wb = WorkbookFactory.create(new File("MyExcel.xls"));