Re: [jruby-user] JRuby on Rails on WebSphere

Matt,

If I were you, I'd start WebSphere in debug mode and check out the IBM
implementation of the HttpServeltRequest interface. Maybe the javadocs
can give you som hints:

http://publib.boulder.ibm.com/infocenter/wasinfo/v6r0/index.jsp?topic=/com.ibm.websphere.javadoc.doc/public_html/api/index.html

HTH,

Stefan

2007/11/20, Matt Burke <maburke@xxxxxxx>:
> Hello,
>
> We're having a problem running JRuby 1.0.1 + Rails 1.2.5.7919 +
> WebSphere 6.0.0.1.
>
> The problem is that an exception is thrown whenever rails tries to parse
> parameters from an HTTP POST. The stack trace in the log file looks
> something like this:
>
> /!\ FAILSAFE /!\  Mon Nov 19 11:19:14 EST 2007
>    Status: 500 Internal Server Error
>    Illegal seek
>      action_controller/request.rb:385:in
> `parse_formatted_request_parameters'
>      action_controller/cgi_process.rb:83:in `request_parameters'
>      action_controller/request.rb:279:in `parameters'
>      action_controller/request.rb:19:in `method'
>      action_controller/routing.rb:1456:in `extract_request_environment'
>      action_controller/routing.rb:1397:in `recognize'
>      action_controller/dispatcher.rb:169:in `handle_request'
>      action_controller/dispatcher.rb:114:in `dispatch'
>      action_controller/dispatcher.rb:125:in `dispatch_cgi'
>      action_controller/dispatcher.rb:9:in `dispatch'
>      :1
>
> I haven't figured out what exactly is throwing this exception, but it
> happens when rails does (basically) this:
>    @cgi.stdinput.rewind
>
> I verified that @cgi.stdinput is the same as $stdin.
>
> $stdin is set by RailsServlet to be a RubyIO that wraps the
> HttpServletRequest input stream. This makes me think that WebSphere is
> returning a non-rewindable stream, since this is the only environment
> where I've seen the problem. (We've also tried WebSphere CE and webrick
> in jruby.) But I also noticed that RubyIO wraps InputStreams with
> IOHandlerUnseekable, which throws an exception that ends up saying
> "Illegal Seek" when rewind is called.
>
> So my questions are:
>
> (1) Why does calling rewind work in everything (WEBrick and WASCE) other
> than WebSphere?
>
> (2) Is JRuby the source of the Illegal Seek error? and should it be
> throwing when we (effectively) do a $stdin.rewind?
>
> Thanks,
> Matt
>
>
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