wicket: StalePageException

Question

I am using wicket 6.20. In this wicket page I am using an AbstractDefaultAjaxBehavior for receiving mouse clicks (x,y coordinate) inside wicket:

class CallFromJavaScript extends AbstractDefaultAjaxBehavior {

    private static final long serialVersionUID = -123956851227148114L;

    @Override
    public void renderHead(Component component, IHeaderResponse response) {
        super.renderHead(component, response);

        String callbackUrl = getCallbackUrl().toString();

        String javaScript = "$(document).ready(function()"
                + "{$(document).click(function(e) {"
                + "Wicket.Ajax.get({ u: '" + callbackUrl
                + "&x='+e.clientX+'&y='+e.clientY});});});";
        response.render(OnDomReadyHeaderItem.forScript(javaScript));

    }

    @Override
    protected void respond(final AjaxRequestTarget target) {
        Request request = RequestCycle.get().getRequest();
        x = Integer.parseInt(request.getRequestParameters()
                .getParameterValue("x").toString());
        y = Integer.parseInt(request.getRequestParameters()
                .getParameterValue("y").toString());

        //more code....

        }
    }
}

If I open the page with one user (one session), everything works fine. But If I open the page with an other user(different session/other computer) I receive a StalepageException:

RequestCycleExtra/qtp848034544-122 - /wicket/wicket/page?2-.... WARN : - Handling the following exception org.apache.wicket.core.request.mapper.StalePageException: null

I have noticed that, If I click with computer A on the page, java goes into the renderHead method. If I click with computer B on the page java goes into the renderHead method again. Alternately java goes into the renderHead method.

If I only open the page with one computer (one session) java goes only a single time into the renderHead method.

Could anybody help me?

Answer 1

Which URL are you using to open the page on the second computer? Specifically, does the URL contain the page ID? Page IDs are only valid within the same session; you can't open the same page instance from within another session. You can only create another instance of the same page class in another session.

I think some clarification between page class vs. page instance is needed here.