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Date: Wed, 30 Nov 2011 16:39:33 -0800 (PST)
From: Aymac <andrew.macdonald@gmail.com>
To: xmlrpc-dev@ws.apache.org
Subject: Re: ServletWebServer + enabledForExtensions
In-Reply-To: <AANLkTimjisej2H5iV=4qRxKrR3OMPyuoHVVTZbTd_nzw@mail.gmail.com>
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I don't suppose you ever found a good solution to this problem?  I've been
trying to resolve the exact same problem as you describe here.  Exceptions
are being thrown because extensions are not enabled; even though, the config
I set does.

I've been digging through code as well.  I found one place where it calls a
newConifg() method, which just creates a config object and extensions are
disabled.  I'm calling setConfig() everywhere I can find, but they don't
appear to get used.

I may have to start looking a little more closely at the code to figure this
one out, which I was hoping to not have to do.  Doing all of this, just to
get the client's IP address.

Andrew  


teemu wrote:
> 
> Hello all,
> 
>  I have been using Apache XMLRPC with extensions enabled with the
> WebServer
> class successfully. However, now I had the need to access also the client
> IP
> address that is making the request to the server. So according to the
> instructions on the project web site, I switched to the ServletWebServer.
> As
> an end result, I manage to access the caller IP address just fine.
> However,
> I have problems getting ServletWebServer to work with extensions enabled.
> 
> I tried this
> 
>       ServletWebServer webServer = new ServletWebServer(new
> MyXmlRpcServlet(myPropertyHandlerMapping), port);
>       webServer.getConfig().setEnabledForExtensions(true);
>       webServer.start();
> 
> which used to work with WebServer but not with ServletWebServer. I get
> exceptions in my code complaining that the features I use require enabling
> the extensions. I thought this should work according to the docs, but
> since
> it did not, I went with plenty of other attempts including
> 
> -creating a new config object, setting enabledForExtension to true, and
> setting this to the server instead of querying the existing one
> -modifying the doPost() method of my MyXmlRpcServlet that extends
> XmlRpcServlet to always call getXmlRpcServer.getConfig() and setting
> enabledForExtension, also the set method above for this
> -always creating a new XmlRpcHandlerMapping or caching one in the servlet,
> because I thought originally I had a problem with some inputstreams being
> used many times (lost the actual exception first)
> -various other approach I forget
> 
> None of those worked for me. I always get the exception that the
> extensions
> are not enabled.
> 
> Then I downloaded the source codes, and tried my best to understand what
> is
> happening. But all the modules are split and I failed to configure my IDE
> to
> properly access all methods across modules. Well, putting my Maven issues
> aside I then tried to understand where the enabledForExtensions should be
> enabled. I ended up somewhere in the XmlRpcWriter class (from my stack
> traces), where I got totally confused about all the different
> configuration
> objects all having the enabledForExtensions flag inside them. One is a
> class
> level object accessed in writeValue() and another one is passed as a
> parameter to write() that calls writeValue(). Similarly other types seemed
> to be spread in the code. Eventually I gave up trying to understand this
> and
> just put in some prints to show what the values are. Both the
> configurations
> in XmlRpcWriter were always false for enabling extensions in all the
> approaches I used. So I never really figured out how I should set this
> flag
> to actually get it enabled with the ServletWebServer.
> 
> I did notice that there is only one place where the configuration value
> for
> enabledForExtension is accessed, and that is in the XmlRpcConfigImpl
> class,
> which all the rest of the config classes seem to extend. So I changed this
> to always return true for extensions and recompiled it all. Using this new
> version I got my code to work. But I would like to implement this properly
> rather than have to recompile my own binaries for the library.
> 
> I am sure I missed something obvious, so perhaps someone could tell me how
> the extension value/configuration object traverses the code base and how
> should I set it to get it used?
> 
> Thanks,
> Teemu
> 
> 

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