Landscape and portrait pages in the same word document using Apache POI XWPF in Java

Question

I am trying to use Java and the Apache POI library to create a word document that contained some landscape and some portrait pages. I can change the orientation of all the pages

Answer 1

Turns out a CTPPr (a section break) is needed, which can be done with the following code:

private void changeOrientation(XWPFDocument document, String orientation){
    CTDocument1 doc = document.getDocument();
    CTBody body = doc.getBody();
    CTSectPr section = body.addNewSectPr();
    XWPFParagraph para = document.createParagraph();
    CTP ctp = para.getCTP();
    CTPPr br = ctp.addNewPPr();
    br.setSectPr(section);
    CTPageSz pageSize = section.getPgSz();
    if(orientation.equals("landscape")){
        pageSize.setOrient(STPageOrientation.LANDSCAPE);
        pageSize.setW(BigInteger.valueOf(842 * 20));
        pageSize.setH(BigInteger.valueOf(595 * 20));
    }
    else{
        pageSize.setOrient(STPageOrientation.PORTRAIT);
        pageSize.setH(BigInteger.valueOf(842 * 20));
        pageSize.setW(BigInteger.valueOf(595 * 20));
    }
}

However, this only works once, so pages can't alternate orientations. It has to be all the landscape pages first and portrait last or vice versa.