jsf2.0 - How to get the values in other jsf page's bean in request scope

Question

I have two pages myaccount.xhtml and selectbank.xhtml In my account page there is one option for recharge account in which user will enter the amount when user will press su

Answer 1

You can use the #{flash} object that will keep your data until the next view. This way you won't need to deal with view parameters.

Details from myaccount.xhtml:

<h:form>
    <h:outputText value="Enter amount: " />
    <h:inputText value="#{flash.amount}" />
    <br/>
    <h:commandButton value="Go to payment method" action="#{bean.gotoPayMethod}" />
<h:form>

Bean of both views:

@ManagedBean
@RequestScoped
public class Bean {

    @ManagedProperty("#{flash}")
    private Flash flash;

    private int amount = -1;

    public Bean () {   }

    public String getAmount() {
        if(amount == -1) {
            int val = Integer.parseInt((String)flash.get("amount"));
            flash.keep("amount");
            amount = val;
        }
        return amount;
    }

    public Flash getFlash() {
        return flash;
    }

    public void setFlash(Flash flash) {
        this.flash = flash;
    }

    public String gotoPayMethod() {
        //do business job
        return "SelectBank?faces-redirect=true";
    }

}

Details from selectbank.xhtml:

<h:outputText value="Amount entered by user is #{bean.amount}" />

Answer 2

Your use case is not of simple request/response cycle, the life span is more than one request response which makes it candidate for session scope.

Using hidden variable or GET parameters in URL is not good practice especially for a banking application. Where security is so important dont compromise on small memory foot print.

If flash scope map simplifies the case you can use it, but I would not go for such a thing.

Update: Forgot to mention you can check Conversation scope too.

Answer 3

Well, if your beans are RequestScoped than you don't have same bean for both pages. These beans are recreated for every request, so you should pass parameters. Change return statement of your gotoPayMethod() to:

return "SelectBank?faces-redirect=true&includeViewParams=true";

and on selectbank.xhtml add:

<f:metadata>
  <f:viewParam name="amount" value="#{bean.amount}" />
</f:metadata>

Adapt this to your property and bean name.

If using parameters is not a solution you can add this parameter in the session, and remove it from session in second bean when you retrieve it:

FacesContext.getCurrentInstance().getExternalContext().getSessionMap().put("amount", amount);
((HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest()).getSession().removeAttribute("amount");

Second construction for removing the attribute is necessary as Map returned from getSessionMap() is immutable.