Bugs item #1555039, was opened at 2006-09-08 18:59
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Category: core
Group: 1.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Alex Burgel (aburgel)
Assigned to: Nobody/Anonymous (nobody)
Summary: Infinite loop on internal parsing error with error page

Initial Comment:
i'm seeing this in wicket 1.2.2

You can get an infinite loop if you access a URL that
causes an exception to get thrown in
wicket.protocol.http.request.WebRequestCodingStrategy
line 406 and when you are using an internal error page
that calls super() in its constructor (explicitly or
implicitly).

This means a URL that looks like
http://host/app?wicket:interface=:1: (its missing the
last colon) will cause an infinite loop.

Here's how it works.

You access that URL and you'll end up throwing a
WicketRuntimeException (because it can't parse the url)
as described above. After that exception is thrown, you
eventually end up in DefaultExceptionResponseStrategy
which then throws a RestartResponseException with your
internalErrorPageClass.

After that exception is thrown, you're back in
RequestCycle which tries to respond with the
internalErrorPageClass. Since this is a class, it has
to create an instance, which will end up calling the
Page constructor, which ultimately ends up calling
WebRequestCodingStrategy.decode, which causes the
exception. and then you have an infinite loop.

The work around is to use page with a constructor that
does not call super() as your internal error page.

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