Question

I make (thanks with some users on this portal) my application that implements SessionAware.

This is my actual code :

public class UserManager extends ActionSupport implements SessionAware {
    private Map<String, Object> session;

    @Override
    public String execute() throws Exception {
        return SUCCESS;
    }

    public void setSession(Map<String, Object> map) {
        this.session=map;
    }

    public String checkLogin() {        
        session.put("loggedOn", true);
        return SUCCESS;
    }

    public String checkLogout() {
        session.clear();
        return SUCCESS;
    }
}

And i check these variables on my .jsp :

<s:if test="#session['loggedOn']!=true">
    DIV LOGIN
</s:if>
<s:else>
    DIV LOGOUT
</s:else>

An easy piece of code.

What i’d like to know is this :

1 – the bean is (as default) request scoped. So when the request is finished it will be destroyed. But i see that, when i put a variable in the Map, it still alive on the server. How is possible? Is a variable of my Bean.

2 – Who call the setSession method? I think the servlet, due to the fact I implements that interface?

3 – I would like to detach about saving object/bean on a Session Object. I’d like to use the Bean session scoped (as for any kind of MVC framework). How can I do it on struts2?

Hope you can make clear these questions 🙂 Cheers

Answer 1

1) Your bean is a struts2 action as such it is action scoped (which is a more restrictive scope than request). I say that action is a lesser scope because you can forward an action to another action in which case the previous action goes out of scope, request scoped objects however will stay in scope until the request is served. When you implement SessionAware you are provided with a reference to the SessionObject you are then putting your object into the Session object who’s life span is much longer than your action. Clear your browser cache will remove the session value… you can also remove them by code be implementing SessionAware and removing the value from the map.

2 – The session already exists. You can get the session and add keys but even if you don’t put anything in it, it will be there for use.

3 – You have a later question already for this topic see my answer there.