I have a misunderstanding with the use of flash scope in jsf 2. I want to put an object in flash map during my action and show this object in the next page. Here is my action (call by h:commandLink):
public String showDetail(PersonneDTO personne) {
MessageFlashBean message = new MessageFlashBean();
message.addMessage("test");
FacesContext.getCurrentInstance().getExternalContext().getFlash()
.put("test", message);
return "showDetail";
}
It's just a test, but the real object I want to use is more complex.
Here is the second page with the flash use:
<ui:fragment rendered="#{flash.test != null and flash.test.hasMessage()}" >
<ui:repeat var="message" value="#{flash.test.messages}">
#{message}
</ui:repeat>
</ui:fragment>
Here is the navigation (and here is my problem :) ):
<navigation-rule>
<from-view-id>/index.xhtml</from-view-id>
<navigation-case>
<from-outcome>showDetail</from-outcome>
<to-view-id>/private/showDetail.xhtml</to-view-id>
</navigation-case>
</navigation-rule>
In this case, the flash scope works fine and my message appears.
But if I add a redirect in the navigation case, my object in the flash map has disappeared.
I don't understand why I can't use redirect in the navigation rule (I believed it was the goal of flash scope).
May be something is wrong in my code.
Someone can help me ?
Thanks
The Mojarra's implementation of the JSF2 Flash scope had a lot of problems. Most of them were resolved with every new Mojarra release. Currently, with the latest Mojarra version, the 2.1.6, there's as far as I know still only one major open problem: it won't work if you redirect to a different base path. See also the (currently) last comment in the long discussion in issue 1751.
Right now, you have basically the following options:
Forget using Flash when you need to redirect to a different base path. Use a request parameter instead or try to simulate the flash scope with a custom cookie.
If possible, reorganize the folder structure so that you don't need to redirect to a different base path when you need the flash scope to survive.
Try MyFaces instead of Mojarra. Maybe it does it better with regard to flash scope.
Update: as per issue 2136, the last open problem of Flash scope not being available after a redirect on a different path is solved in the shortly upcoming Mojarra 2.1.14. So with this version, all Flash scope related problems discovered and open so far should be solved and closed.