Rails - Jun 2014 - Getting random threading errors in jruby (1.7.3) & rails 2.3.17 application

I am running jruby (1.7.3) & rails 2.3.17 application whose apis are 
exposed to outside app. When I add "config.threadsafe!" in my 
development.rb/production.rb & hit lot many api requests in a second then I 
am getting following errors randomly for some of the api requests:

   1. TypeError (NilClass can't be coerced into Float)
   2. RuntimeError (can't add a new key into hash during iteration)
   3. Rendering /appl/mml/tomcat/server/mml-api1/webapps/api/500.html (500 
   Internal Server Error)
   4. Status: 500 Internal Server Error

Does newer jruby version solves this issue? But my application does not 
support jruby > 1.7.3.

Also even if I add the affecting method in below synchronize block then 
also it is not synchronizing that method. Note : I have added 
"config.threadsafe!" in my development.rb & production.rb 

 semaphore = Mutex.new
        thread = Thread.new {
          semaphore.synchronize {
                                   #affecting code/method
                }
               }

But if I remove "config.threadsafe!" from my
development.rb/production.rb &
hit huge number of requests I am not getting any error but this time 
performance is impacted.

Is there any solution to remove these errors without affecting the 
performance?

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