The table has no background color

I want the first row or the first column of the table to be colored。This is my data and my code
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 private static void writeTable(DocumentBuilder documentBuilder, List<List<String>> list, TitleDirection titleDirection) throws Exception {

    Table table = documentBuilder.startTable();
    documentBuilder.getCellFormat().setFitText(true);
    documentBuilder.getParagraphFormat().setAlignment(ParagraphAlignment.CENTER);
    documentBuilder.getCellFormat().clearFormatting();
    documentBuilder.getCellFormat().setVerticalAlignment(CellVerticalAlignment.CENTER);
    for (int row = 0; row < list.size(); row++) {
        for (int colum = 0; colum < list.get(row).size(); colum++) {
            if (titleDirection == TitleDirection.TRANSVERSE){
                if(row == 0){
                     documentBuilder.getCellFormat().getShading().setBackgroundPatternColor(Color.getHSBColor(189, 214, 229));
                }
                documentBuilder.insertCell();
                documentBuilder.write(list.get(row).get(colum));
                if(row == 0){
                    documentBuilder.getCellFormat().getShading().clearFormatting();
                }
            }
            if (titleDirection == TitleDirection.PORTRAIT){
                if(colum == 0){
                    documentBuilder.getCellFormat().getShading().setBackgroundPatternColor(Color.getHSBColor(189, 214, 229));
                }
                documentBuilder.insertCell();
                documentBuilder.write(list.get(row).get(colum));
                if(colum == 0){
                    documentBuilder.getCellFormat().getShading().clearFormatting();
                }
            }
        }
        documentBuilder.endRow();
    }
    documentBuilder.endTable();
    documentBuilder.getParagraphFormat().setAlignment(ParagraphAlignment.LEFT);
}

@860534 The problem occurs because in your code you are clearing background of the current cell, i.e. you set background and then after putting cell content immediately clear its background. I have modified your code and now it should work as expected.

private static void writeTable(DocumentBuilder documentBuilder, List<List<String>> list, TitleDirection titleDirection) throws Exception {

    Table table = documentBuilder.startTable();
    documentBuilder.getCellFormat().setFitText(true);
    documentBuilder.getParagraphFormat().setAlignment(ParagraphAlignment.CENTER);
    documentBuilder.getCellFormat().clearFormatting();
    documentBuilder.getCellFormat().setVerticalAlignment(CellVerticalAlignment.CENTER);
    for (int row = 0; row < list.size(); row++) {
        for (int colum = 0; colum < list.get(row).size(); colum++) {
            documentBuilder.insertCell();
            documentBuilder.write(list.get(row).get(colum));
            if ((titleDirection == TitleDirection.TRANSVERSE)&& (row == 0)){
                documentBuilder.getCellFormat().getShading().setBackgroundPatternColor(Color.getHSBColor(189, 214, 229));
            }
            else if ((titleDirection == TitleDirection.PORTRAIT) && (colum == 0)){
                documentBuilder.getCellFormat().getShading().setBackgroundPatternColor(Color.getHSBColor(189, 214, 229));
            }
            else  {
                documentBuilder.getCellFormat().getShading().clearFormatting();
            }
        }
        documentBuilder.endRow();
    }
    documentBuilder.endTable();
    documentBuilder.getParagraphFormat().setAlignment(ParagraphAlignment.LEFT);
}

Thank you, I mistakenly thought that coloring should come before writing data