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

Can you upgrade your WebFear? We didn't have these
issues with WAS6.1.mumble. We did, however, have some
major performance issues under pretty light loads, and
had to abandon ship. We'll run our tests again with
JRuby 1.1 at some point to see how things are panning
out, though.

d.

--- Matt Burke <maburke@xxxxxxx> wrote:

> 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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