ui: For table rows created with repeat, press the f:ajax Add button to add rows.

<table jsf:id="tableid">
    <thead>
        <tr>
            <th>AAA</th>
            <th>BBB</th>
            <th>CCC</th>
        </tr>
    </thead>
    <tbody jsf:id="tbodyid">
        <ui: repeat id="repeatid" varStatus="sts" var="record" value="#{XXXXBean.dataList}">
            <trjsf:id="trid">
                <td>
                    <input type="text" jsf:value="#{record.aaa}" jsf:id="recordaaa" />
                </td>
                <td>
                    <input type="text" jsf:value="#{record.bb}"jsf:id="recordbb"/>
                </td>
                <td>
                    <input type="text" jsf:value="#{record.cccc}" jsf:id="recordccc"/>
                </td>
            </tr>
        </ui: repeat>
    </tbody>
</table>

<f:ajax execute="@this" listener="#{XXXXBean.addRow}" render="tbodyid">
    <h:commandButton id="addbtn" value="addbtn" />
</f:ajax>

@Named("XXXXBean")
@SessionScoped
public class XXXXBean extensions BaseBean {
    private List <dataListBean>dataList=null;

    // Initial display processing
    @ PostConstruct
    public void init() {
        // Add only one line
        dataList = new ArrayList <>();
        dataList.add (new dataListBean());
        dataList.get(0).setAaa(1);
        dataList.get(0).setBbb(1);
        dataList.get(0).setCcc(1);
    }

    // Add Row
    public void addRow() {
        dataList.add (new dataListBean());
    }

    publicList<dataListBean>getDataList(){
        return dataList;
    }

    public void setDataList(List<dataListBean>dataList){
        This.dataList=dataList;
    }
}

public class dataListBean{
    private int aaa;
    private int bbb;
    private int ccc;

    public int getAa(){
        return aaa;
    }
    public void setAaa(intaaa){
        This.aaa = aaa;
    }
    public int getBbb(){
        return bbb;
    }
    public void setBbb(intbbb){
        This.bbb = bbb;
    }
    public int getCcc(){
        return ccc;
    }
    public void setCcc(intcccc){
        This.ccc =cc;
    }
}