[jboss-user] [JBoss Seam] - Re: @Out and default ScopeType
dan.j.allen
do-not-reply at jboss.com
Sat Nov 25 14:43:00 EST 2006
Gavin et al,
I am still a bit confused about which scope to use for the @Out annotation. Let me provide a brief example and hopeful it demonstrates my misunderstanding.
I have the following stub backing bean:
@Name( "userManager" )
| @Scope(CONVERSATION)
| public class UserManagerBean {
| @In( required = false )
| @Out( required = false, scope = CONVERSATION )
| private User user;
|
| public String create() {
| return "/user/new.jspx";
| }
|
| public String view() {
| return "/user/view.jspx";
| }
| public String save() {
| assert user != null;
| // do whatever to save...
| return view();
| }
|
| // ...other supporting methods, including @Begin and @End methods
| }
|
Assume that the flow is: request create -> enter info -> save -> view and that the conversation is being created around this process by some other methods (meaning I know that I have a working conversation).
I am curious to know why I need ScopeType.CONVERSATION on the @Out annotation. The assertion in the save() method passes, so I know at that point that the property "user" does indeed have a value. However, if I don't set the scope on the @Out annotation, by the time I get to view.jspx, the EL variables that reference "user" (such as #{user.name}) are all empty.
Is it always necessary to use ScopeType.CONVERSATION for the @Out annotation if the component itself is in conversation scope?
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