如何在两个@ViewScoped bean之间共享数据？

Question

I am trying to pass id (long) from one.xhtml to another .xhtml. Both the backing beans are @ViewScoped and I am trying to share long id between them.

I am getting error with <f:viewParam/>

com.sun.faces.mgbean.ManagedBeanCreationException : Unable to create managed bean saleOrder. The following problems were found: - The scope of the object referenced by expression #{param.foo} , request, is shorter than the referring managed beans ( saleOrder ) scope of view.

I am have following code.

@ManagedBean    
public class InvoiceView{
    private long number;
    // setter getter.
}

@ManagedBean
@ViewScoped
public SearchInvoice{
    private List<InvoiceView> views;
    private InvoiceView selectedView;  // this is coming from <p:dataTable>
}

@ManagedBean
@ViewScoped
public class SaleOrder {

    @ManagedProperty("#{param.foo}")
    private String number;

    @PostConstruct
    public void init(){
       //sysout number;
    }
}

I have following code in searchInvoice.xhtml file.

    <!-- I have not desclared <f:metadata/> -->
<h:commandButton value="Place Sale Order"
                 action="#{searchInvoice.forwardToSaleOrder}" <!-- this return saleOrder.xhtml string -->
                 rendered="#{not empty searchInvoice.views}">
        <f:viewParam name="foo" value="#{searchInvoice.selectedView.number}" />
</h:commandButton>

Answer 1

You can use <f:viewParam> (JSF 2) in saleOrder.xhtml, which works with view scoped beans. Check out this article .