使用Apache POI在Excel中的一定数量的单元格后字体消失

Question

When trying to copy over cell styles from an old Excel file, after writing 32357 cells, the font disappears and when finding the root of the problem, I came across the error that it's throwing this:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -32768
    at java.util.ArrayList.elementData(ArrayList.java:400)
    at java.util.ArrayList.get(ArrayList.java:413)
    at org.apache.poi.xssf.model.StylesTable.getFontAt(StylesTable.java:210)
    at org.apache.poi.xssf.usermodel.XSSFCellStyle.getFont(XSSFCellStyle.java:561)
    at Compare.writeRows(Compare.java:415)
    at Compare.main(Compare.java:44)

and to copy over the CellStyle from the old Excel file, I did this:

XSSFCellStyle style = workbook.createCellStyle();
style.cloneStyleFrom(oldCell.getCellStyle());
newCell.setCellStyle(style);
style.getFont(); //throws error here
newCell.setCellType(oldCell.getCellType());

But I don't understand why it's doing that because when I do rows.get(2506).getCell(2).getCellStyle().getFont() it returns an XSSFFont object (the XSSFFont that style.getFont() should be returning) and doesn't throw an Exception .

I would really appreciate if someone could help me with this problem.

Answer 1

Apache POI is limited to 32767 Fonts per workbook

You will need to find a way to reuse the fonts and cell styles.