Hey,
I have a GAE Java project where I use Jersey (1.17) and Guice (3.0).
SessionScoped beans work in local dev, but don't work when deployed on GAE.
The problem is that they don't keep session state.
Sessions are enabled in web.xml: <sessions-enabled>true</sessions-enabled>
My Session bean (SessionService) is:
@SessionScoped
public class SessionService implements Serializable {
@Inject transient Logger log;
private Locale locale = Locale.US;
public synchronized Locale getLocale() { return locale; }
public synchronized void setLocale(Locale locale) { this.locale =
locale; }
}
and it's bound to Session scope in ServletModule :
bind(SessionService.class).in(ServletScopes.SESSION);
Controller where I use it is:
@Path("/settings")
public class SettingsController {
@Inject SessionService sessionService;
@GET
@Path("/setLocale")
public Object setLocale(@QueryParam("languageTag") String languageTag) {
sessionService.setLocale(Locale.forLanguageTag(languageTag));
return "OK";
}
@GET
@Path("/getLocale")
public Object getLocale() { return
sessionService.getLocale().getLanguage(); }
}
With local dev server it works fine. When deployed on GAE (1.9.5) it sets
the locale the first time and then it stays the same forever even though I
call setLocale again and again. Why does it not work ?
Strangely enough, I found an obscure way to make it work, but I don't know
why it makes it work. To have it running, it's necessary to touch
HttpSession before setting locale. Like
request.getSession(true).setAttribute("whatever", "bar"). As if server
needed to be recalled that SessionService wants to do something with
Session. Why is that?
Cheers,
Michal
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