Set default servlet

Question

I tried to set default servlet by this way:

@WebServlet({"/abc", "","/"})
public class GreetingServlet extends HttpServlet {

    @Override
    public void doGet(HttpServletRequest request,
            HttpServletResponse response)
            throws ServletException, IOException {
        getServletContext().getRequestDispatcher("/asd/ind.html").forward(request,response);
    }

    @Override
    public String getServletInfo() {
        return "The Hello servlet says hello.";

    }
}

The file /asd/ind.html is exist, when I remove "/" like :

@WebServlet({"/abc", ""})

the redirection works fine when I hit:

contextpath/abc contextpath/ contextpath

But with "/" like

@WebServlet({"/abc", "","/"})

It turns out

javax.servlet.ServletException: AS-WEB-CORE-00089

When I hit any URL at all, even the previous ones that did work.

Could anyone please give me an explanation? the "/" should make the servlet default which means any unmapped URL should redirected to GreetingServlet.

"/" does not match any unmapped url. It just means that when you don't supply a path (e.g. www.example.com) it gets assigned to that servlet. — krato, Mar 07 '16 at 11:01
This is working for me, there is no problem with / but if you use /*, AS-WEB-CORE-00089 is thrown because of redirect loop. Can you check it. Maybe your web.xml have /* — Yusuf K., Mar 07 '16 at 11:23
@krato As per servlet specidication A string containing only the / character indicates the "default" servlet of the application. In this case the servlet path is the request URI minus the context path and the path info is null. — Aladdin, Mar 07 '16 at 13:35
@YusufK. no web.xml hasn't .. I tried to remove it at all and the same problem. — Aladdin, Mar 07 '16 at 13:36
@YusufK., kindly I know this could be done by welcome page, but I need to know what's the problem of above code, for now I'm pretty sure the problem is from forward because I commented out it and print test message and it works fine. — Aladdin, Mar 07 '16 at 13:49
@user3305603 I tried your code on my server(glassfish 4.1.1). Only '/*'is causing the AS-WEB-CORE-00089 exception, maybe some definitions of your server may cause that. — Yusuf K., Mar 07 '16 at 13:51
@YusufK. did you try that with : getServletContext().getRequestDispatcher("/asd/ind.html").forward(request,response); ?? — Aladdin, Mar 07 '16 at 13:53
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/105565/discussion-between-yusuf-k-and-aladdin). — Yusuf K., Mar 07 '16 at 13:54

score 1 · Accepted Answer · answered Mar 07 '16 at 14:48

The problem happened because the default servlet maps the URI to the static path if it's not mapped to any servlet, but what I did is redefining the default servlet, so when I redirect to /asd/ind.html and this URI is not mapped to any servlet the default serlvet is called and in this case the default one is GreetingServlet, this causes infinite loop.

Set default servlet

1 Answers1