如何合并xwpftable单元格

Question

我正在使用apache poi创建ms word文档。我想创建一个这样的表。

为此，我需要合并表单元格。我写了这段代码

XWPFParagraph paragraph = document.createParagraph();
        XWPFRun baslik1 = paragraph.createRun();
        baslik1.setFontSize(12);
        baslik1.setBold(true);
        baslik1.setText("SECTION 1: MAINTENANCE SUMMARY");
        baslik1.addBreak();
        InputStream summary_pic=access_connection.class.getResourceAsStream("summary.png");
        try {
            String reason = null;
            Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
            baglanti2= DriverManager.getConnection("jdbc:ucanaccess://" + db_ans,db_ans_username,db_ans_password);
            sorgu2=baglanti2.createStatement(); 
            ResultSet summary=sorgu2.executeQuery("SELECT * FROM TableWSINI WHERE strSO='"+salesOrder+"'");
            while(summary.next())
            {
                reason=summary.getString("strRemReason");
            }
            XWPFParagraph para = null;
            CTHMerge hMerge=CTHMerge.Factory.newInstance();
            hMerge.setVal(STMerge.CONTINUE);
            XWPFTable table=document.createTable(18,5);
            table.getRow(0).getCell(0).setText("Removal Reason");
            table.getRow(0).getCell(1).setText(reason);
            table.getRow(0).getCell(2).getCTTc().getTcPr().setHMerge(hMerge);
            table.getRow(0).getCell(3).getCTTc().getTcPr().setHMerge(hMerge);
            table.getRow(0).getCell(4).getCTTc().getTcPr().setHMerge(hMerge);
            XWPFTableRow row2=table.getRow(0); //row2
            para=row2.getCell(0).addParagraph();
            XWPFRun run=para.createRun();
            run.addPicture(summary_pic, XWPFDocument.PICTURE_TYPE_PNG, "Images", Units.toEMU(500), Units.toEMU(250));
            FileOutputStream input = new FileOutputStream(new File(word_saveas_file+salesOrder+"_"+type+"_Report.docx"));
            document.write(input);
            input.close();

但是我遇到了这个错误。

java.lang.NullPointerException
    at access_read_and_write.access_connection.summary(access_connection.java:1370)
    at access_read_and_write.access_connection.Start(access_connection.java:228)
    at Servlet.shop_visit_report.doGet(shop_visit_report.java:55)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52

我的第1370行是 table.getRow（0）.getCell（2）.getCTTc（）。getTcPr（）。setHMerge（hMerge）;