DataTable 列分页问题

DataTable Columns Pagination Issue

使用展示示例,声明式 p:dataTable 与 p:columns 和分页一起工作。

我想让它以编程方式工作,并在页面加载网格中显示数据。当我点击程序化的分页时,所有数据都丢失了。它仍然显示正确的行,但我不确定为什么数据丢失了。

项目:https://github.com/ravihariharan/primefaces-test Primefaces 6,JSF 2.2.14,在 Tomcat8.5.3

参考: 1. main/webapp/columns.xhtml 2. main/java/org/primefaces/showcase/view/data/datatable/ColumnsView.java

@PostConstruct
public void init() {
    cars = service.createCars(50);

    createDynamicColumns();

    createProgramaticGrid();
}

private void createProgramaticGrid() {
    DataTable dataTable = createDataTable();

    dataTable.setId("progCars");
    dataTable.setVar("progCar");
    dataTable.setValueExpression("value", createValueExpression("#{dtColumnsView.cars}", List.class));

    dataTable.setPaginator(true);
    dataTable.setRows(10);
    Columns columns = createColumn();
    ValueExpression columnValues = createValueExpression("#{dtColumnsView.columns}", List.class);
    columns.setValueExpression("value", columnValues);
    columns.setVar("column");

    OutputLabel headerValue = createOutputLabel();
    headerValue.setValueExpression("value", createValueExpression("#{column.header}", String.class));
    columns.getFacets().put("header", headerValue);

    OutputLabel value = createOutputLabel();
    value.setValueExpression("value", createValueExpression("#{progCar[column.property]}", String.class));

    columns.getChildren().add(value);

    dataTable.getChildren().add(columns);

    FacesContext context = FacesContext.getCurrentInstance();
    UIViewRoot viewRoot = context.getViewRoot();
    viewRoot.findComponent("form:mainGridBody").getChildren().add(dataTable);

}

private OutputLabel createOutputLabel() {
    return (OutputLabel) createComponent(OutputLabel.COMPONENT_TYPE);
    // return new OutputLabel();
}

private Columns createColumn() {
    return (Columns) createComponent(Columns.COMPONENT_TYPE);
    // return new Columns();
}

private DataTable createDataTable() {
    return (DataTable) createComponent(DataTable.COMPONENT_TYPE);
    // return new DataTable();
}

private UIComponent createComponent(String componentType) {
    return FacesContext.getCurrentInstance().getApplication().createComponent(componentType);
}

columns.xhtml

    <h3>programmatic</h3>
    <p:panel id="mainGridBody">

    </p:panel>

我使用 javax.faces.FULL_STATE_SAVING_VIEW_IDS 让这个工作正常。

javax.faces.FULL_STATE_SAVING_VIEW_IDS

<context-param>
    <param-name>javax.faces.FULL_STATE_SAVING_VIEW_IDS</param-name>
    <param-value>/columnsprog.xhtml</param-value>
</context-param>