src/org/tiefaces/components/websheet/utility/CellUtility.java
public static void createOrInsertComment(final Cell cell, final String commentStr) {

		XSSFSheet sheet = (XSSFSheet) cell.getSheet();
		CreationHelper factory = sheet.getWorkbook().getCreationHelper();
		Drawing drawing = sheet.createDrawingPatriarch();
		Comment comment = cell.getCellComment();
		String originStr = "";
		if (comment == null) { 
			// Below code are from POI busy manual.
			// When the comment box is visible, have it show in a 1x3 space
			ClientAnchor anchor = createCommentAnchor(cell, factory);
			// Create the comment and set the text+author
			comment = drawing.createCellComment(anchor);
		} else {
			originStr = comment.getString().getString()+"\n";
		}
		originStr +=  commentStr;
		RichTextString str = factory.createRichTextString(originStr);
		comment.setString(str);
		comment.setAuthor("");
		// Assign the comment to the cell
		cell.setCellComment(comment);
		comment.setColumn(cell.getColumnIndex());
		comment.setRow(cell.getRowIndex());
	}
public static void createOrInsertComment(final Cell cell, final String commentStr) {

		XSSFSheet sheet = (XSSFSheet) cell.getSheet();
		CreationHelper factory = sheet.getWorkbook().getCreationHelper();
		Drawing drawing = sheet.createDrawingPatriarch();
		Comment comment = cell.getCellComment();
		String originStr = "";
		if (comment == null) { 
			// Below code are from POI busy manual.
			// When the comment box is visible, have it show in a 1x3 space
			ClientAnchor anchor = createCommentAnchor(cell, factory);
			// Create the comment and set the text+author
			comment = drawing.createCellComment(anchor);
		} else {
			originStr = comment.getString().getString()+"\n";
		}
		originStr +=  commentStr;
		RichTextString str = factory.createRichTextString(originStr);
		comment.setString(str);
		comment.setAuthor("");
		// Assign the comment to the cell
		cell.setCellComment(comment);
		comment.setColumn(cell.getColumnIndex());
		comment.setRow(cell.getRowIndex());
	}
Creates the or insert comment.

@param cell the cell
@param commentStr the comment str