POI的autoSizeColumn方法抛出了我无法解决的异常：

 "java.lang.ClassNotFoundException: Didn't find class "java.awt.font.FontRenderContext" on path:..." 

有这个错误

"java.lang.NoClassDefFoundError: Failed resolution of: Ljava/awt/font/FontRenderContext;"

这是我的代码,在将数据放入列后调用该方法：

  private boolean saveExcelFile(Context context,String fileName) {

    if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) {
        Log.e("ExcelLog","Storage not available or read only");
        return false;
    }

    boolean success = false;

    Cell c;

    Workbook wb = new HSSFWorkbook();

    CellStyle cs = wb.createCellStyle();
    cs.setFillForegroundColor(HSSFColor.LIGHT_ORANGE.index);
    cs.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

    Sheet sheet1;
    sheet1 = wb.createSheet("Historique du "+date);

    MultiFormatWriter writer = new MultiFormatWriter();
    Bitmap ImageBitmap;

    CreationHelper helper = wb.getCreationHelper();

    Drawing drawing = sheet1.createDrawingPatriarch();

    Row row = sheet1.createRow(0);

    c = row.createCell(0);
    c.setCellValue("Quantité");
    c.setCellStyle(cs);

    c = row.createCell(1);
    c.setCellValue("Code barre");
    c.setCellStyle(cs);

    c = row.createCell(2);
    c.setCellValue("Association");
    c.setCellStyle(cs);

    int m = 0;
    for(int k=0;kFailed to save file",e);
    } finally {
        try {
            if (null != os)
                os.close();
        } catch (Exception ignored) {
        }
    }
    Toast.makeText(getApplicationContext(),"Success",Toast.LENGTH_LONG).show();
    return success;
}

有人有任何线索可以帮助我吗？
提前致谢.