private static POILogger log = POILogFactory.getLogger(XSSFWorkbook.class);
public XSSFWorkbook() {
this.workbook = CTWorkbook.Factory.newInstance();
CTBookViews bvs = this.workbook.addNewBookViews();
CTBookView bv = bvs.addNewWorkbookView();
bv.setActiveTab(0);
this.workbook.addNewSheets();
// We always require styles and shared strings
sharedStringSource = new SharedStringsTable();
stylesSource = new StylesTable();