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I want to use a custom RGB color (38,38,38) for my cell backgroundcolor. For that I use this code:

IndexedColorMap colorMap = wb.getStylesSource().getIndexedColors(); 
XSSFColor customtablegrey = new XSSFColor(new java.awt.Color(38,38,38), colorMap);
cellFormat1.setFillForegroundColor(customtablegrey.getIndex());
cellFormat1.setFillPattern(FillPatternType.SOLID_FOREGROUND);

But all I get is a black background. Why and how can I change it? enter image description here

Best Regards,

Christian

Muddyblack k
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1 Answers1

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That's true. IndexedColorMap is useless for XSSFColors. XSSFColors are not indexed colors. In Office Open XML custom colors are stored as RGB directly in the XML. They are not stored in any kind of color map.

Setting XSSFColors as fill foreground color to cell styles is possible using XSSFCellStyle.setFillForegroundColor(XSSFColor color) only. It cannot be set using CellStyle.setFillForegroundColor(short fg).

So cellFormat1.setFillForegroundColor(customtablegrey) should work when cellFormat1 is a XSSFCellStyle.

How to use colors not in IndexedColors for Apache POI XSSF Excel? shows a complete example for how to use XSSFColor as cell fill color. Just tested using apache poi 5.1.0 too.

APACHE POI 4.1 : Set cell background color from hex code shows another complete example. Also tested and works using apache poi 5.1.0 too.

Axel Richter
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