How does Wicket setResponsePage() method work?

Question

When learning about JSP and servlets, I heard about redirect and dispatch. Which of them does Wicket's setResponsePage() perform?

Uveitis

Answer 1

What setResponsePage does is dependent on a couple of factors: how many times you call setResponsePage, which variant of the setResponsePage you call and what render strategy you use.

You can call setResponsePage many times during a request. Wicket uses the last one to work with.

There are two variants of setResponsePage: with a Page instance and with a Page class and PageParameters. The latter sends a redirect to a bookmarkable URL to the browser. The former will, depending on the render strategy, either:

• ONE_PASS_RENDER
  • render the page directly to the browser
• REDIRECT_TO_BUFFER
  • render the page to a buffer, send a redirect to the browser (which then retrieves the buffered, rendered markup), or
• REDIRECT_TO_RENDER
  • send a redirect to the browser, which then sends a request to render the page

So the first option is dispatch, the second option is dispatch followed by a redirect, and the third option would be redirect in servlet terms.

Elbert

@Martin Dashorst: does the browser see a 302 in REDIRECT_TO_BUFFER? – Yodle

Just tried it with my project: Request URL:localhost:8080/som/app/home?14-2.ILinkListener-menu-personalia Request Method:GET Status Code:302 Found So yes, Wicket sends a 302 in that case. – Elbert

@Martin Dashorst: thanks, this actualy explains why we have an 302 that takes longer than the 2, reqeust, because of the buffer. Great, another mystery solved ;) – Yodle

Thanks, I can now relax knowing that XD. May be someday be some wicket guru like you or Igor. LoL. – Uveitis

The right render strategy to use may vary case by case. The setting is application-wide. Shouldn't it be (ideally) set per request cycle? – Tallowy

Answer 2

setResponsePage(PageName.class) will redirect the browser to the PageName you need to go. Make sure that, you have already mount your Page.class to a given path. For example, in your Application init method, you can mount like this mountPage("/home.html", WelcomePage.class); then in some other page, when you have a need to go to the home page, you just call like this setResponsePage(WelcomePage.class);

Shaikh