CTSheetFormatPr format = Context.getsmlObjectFactory().createCTSheetFormatPr();
format.setDefaultRowHeight(5);
format.setCustomHeight(Boolean.TRUE);
sheet.getJaxbElement().setSheetFormatPr(format);
SheetData sheetData = sheet.getJaxbElement().getSheetData();
Row row = Context.getsmlObjectFactory().createRow();
row.setHt(66.0);
row.setCustomHeight(Boolean.TRUE);
row.setR(1L);
Cell cell1 = Context.getsmlObjectFactory().createCell();
cell1.setV("1234");
row.getC().add(cell1);
Cell cell2 = Context.getsmlObjectFactory().createCell();
cell2.setV("56");
row.getC().add(cell2);
sheetData.getRow().add(row);
SaveToZipFile saver = new SaveToZipFile(pkg);
saver.save( System.getProperty("user.dir") + "/data/xlsx4j/RowHeight-Xlsx4j.xlsx");
}