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From Mark Thomas <ma...@apache.org>
Subject Re: a servlet-related Java question
Date Wed, 21 Apr 2010 18:54:26 GMT
On 21/04/2010 19:52, André Warnier wrote:
> Hi.
> A while ago, I wrote a servlet filter which has served me well since, to
> wrap a servlet for which I do not have nor can obtain the source code,
> and of which I only generally know what it does.
> Now it seems that with a new version of this servlet, the servlet itself
> crashes when wrapped by my filter, with a
> java.lang.StringIndexOutOfBoundsException.
> 
> My servlet filter, under certain conditions, creates a
> HttpRequestWrapper derived object, which it passes to the servlet
> instead of the original HttpServletRequest object.
> I have a suspicion that the ultimate reason for the servlet crash, is
> that it now calls a method which I have not re-defined in my wrapper,
> which method the previous servlet version did not call (and that it is
> not very defensive about the result it expects to get, but nothing I can
> do about that).
> 
> All this to ask the following : is there some generic java tool which
> allows to examine a compiled .class file, and determine which methods of
> HttpServletRequest it calls ?
> I do not need nor want to decompile the class, just to know what it calls.

I'd just use JAD and decompile it.

Mark



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