Server error on Ajax request; Rails 2.3.5 on Glassfish gem 1.0.3dev on JRuby 1.5.3

gistfile1.txt

Nov 23, 2010 4:22:16 PM sun.reflect.GeneratedMethodAccessor1 invoke
INFO: /!\ FAILSAFE /!\  Tue Nov 23 16:22:16 +0000 2010
  Status: 500 Internal Server Error
  undefined method `merge' for nil:NilClass
    /root/deployments/bank/current/localgems/gems/activesupport-2.3.5/lib/active_support/whiny_nil.rb:52:in `method_missing'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/request.rb:389:in `parameters'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/base.rb:1288:in `assign_shortcuts'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/base.rb:527:in `process'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/filters.rb:606:in `process_with_filters'
    /root/deployments/bank/current/localgems/gems/haml-2.2.20/lib/sass/plugin/rails.rb:20:in `process'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/rescue.rb:65:in `call_with_exception'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:90:in `dispatch'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:121:in `_call'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:130:in `build_middleware_stack'
    /root/deployments/bank/current/localgems/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:29:in `call'
    /root/deployments/bank/current/localgems/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:29:in `call'
    /root/deployments/bank/current/localgems/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
    /root/deployments/bank/current/localgems/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:9:in `cache'
    /root/deployments/bank/current/localgems/gems/activerecord-2.3.5/lib/active_record/query_cache.rb:28:in `call'
    /root/deployments/bank/current/localgems/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/string_coercion.rb:25:in `call'
    /root/deployments/bank/current/localgems/gems/rack-1.0.1/lib/rack/head.rb:9:in `call'
    /root/deployments/bank/current/localgems/gems/rack-1.0.1/lib/rack/methodoverride.rb:24:in `call'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/params_parser.rb:15:in `call'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/session/cookie_store.rb:93:in `call'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/failsafe.rb:26:in `call'
    /root/deployments/bank/current/localgems/gems/rack-1.0.1/lib/rack/lock.rb:11:in `call'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:114:in `call'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/reloader.rb:34:in `run'
    /root/deployments/bank/current/localgems/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:108:in `call'
    /root/deployments/bank/current/localgems/gems/glassfish-1.0.3.dev-universal-java/lib/../lib/rack/adapter/rails.rb:133:in `call'
    /root/deployments/bank/current/localgems/gems/glassfish-1.0.3.dev-universal-java/lib/../lib/rack/handler/grizzly.rb:55:in `call'
    :1