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Note: You might be confused by the name "_Application_StateManager" and "_Application_StateCreator"; these reflect a difference in naming between 5.0 and 5.1; SSOs were originally called "Application State Objects", but that naming implied they were stored in the ServletContext, as application global to all users. The new SessionState annotation was introduced, but the existing services need to keep thier names as-is.

Session Attributes

As an alternative to SSOs, Tapestry provides a Session Attribute mechanism, which lets you store data in the session by name (rather than type). It is particularly useful when integrating Tapestry with legacy applications that directly manipulate the HttpSession.

public class Page {
    @Inject
    private Request request;
    
    public User getUser() {
        return (User) request.getSession(true).getAttribute("loggedInUserName");
    }
}

Since Starting with Tapestry 5.2, this can be accomplished just by annotating a page or component property with @SessionAttribute. This annotation is used to map a property of a page or component to value stored in session. Unlike Session State Objects, the name (not the type) of the annotated property is used as the name of the session attribute to look for.

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