Quick question that should probably be easily answered by someone.

I have been developing a JavaScript app and RhoConnect application.  The JavaScript RhoConnect performance has been abominable when requests outnumber the number of cores on your server.  We have traced the issue down and are working with Zebra for a fix.

However in the meantime, we are trying to rewrite the RhoConnect piece in Ruby (we have no in-house Ruby experience).  Since there is no business logic in the RhoConnect piece, it really isn't too hard.

The issue I am having is about raising and handling errors.  The back-end API will send an error message back if, for instance, a create cannot completed (missing information, etc.).  I want to take that error and raise it back to the application.  I am able to do that successfully, but the RhoConnect console produces a stack trace that makes me believe I should be handling the error differently.

Basically, in the RhoConnect app I will do the following:

raise Rhoconnect::Model::Exception.new(json_data['errorMessage'].to_s);

And the console logs the following -- Is this normal?

[7124][10:40:42.979 AM 2014-12-17] Model raised create exception: AIK9098 is not in the current transfer file.
[7124][10:40:42.980 AM 2014-12-17] .../models/ruby/transfer_detail.rb:82:in `rescue in create'
.../models/ruby/transfer_detail.rb:62:in `create'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes.rb:17:in `block in registered'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:97:in `call'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:97:in `_process_create'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:200:in `block (3 levels) in _process_cud'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:175:in `each'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:175:in `block (2 levels) in _process_cud'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:163:in `each'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:163:in `block in _process_cud'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:156:in `each'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:156:in `_process_cud'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:90:in `block in _measure_and_process_cud'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/stats/record.rb:54:in `update'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:88:in `_measure_and_process_cud'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:75:in `create'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:69:in `block in run_cud'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:68:in `each'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:68:in `run_cud'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/engine.rb:29:in `do_cud'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/runner.rb:27:in `run'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/execute_methods.rb:65:in `block in _run_cud_handler'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/server.rb:109:in `catch_all'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/execute_methods.rb:64:in `_run_cud_handler'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/handler/changes/execute_methods.rb:9:in `execute_cud_handler'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/server.rb:135:in `block in execute_api_call'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/server.rb:109:in `catch_all'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/server.rb:131:in `execute_api_call'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/server.rb:280:in `block in api4'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1603:in `call'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1603:in `block in compile!'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:966:in `[]'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:966:in `block (3 levels) in route!'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:985:in `route_eval'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:966:in `block (2 levels) in route!'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1006:in `block in process_route'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1004:in `catch'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1004:in `process_route'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:964:in `block in route!'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:963:in `each'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:963:in `route!'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1076:in `block in dispatch!'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `block in invoke'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `catch'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `invoke'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1073:in `dispatch!'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:898:in `block in call!'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `block in invoke'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `catch'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:1058:in `invoke'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:898:in `call!'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:886:in `call'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/middleware/current_user.rb:14:in `call'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/middleware/current_app.rb:12:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/session/abstract/id.rb:225:in `context'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/session/abstract/id.rb:220:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:114:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:91:in `block in new'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/middleware/stats.rb:21:in `call'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/middleware/stats.rb:21:in `call'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/middleware/body_content_type_parser.rb:31:in `call'
...gems/1.9.1/gems/rhoconnect-4.1.0/lib/rhoconnect/middleware/x_domain_session_wrapper.rb:25:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/static.rb:119:in `call'
...gems/1.9.1/gems/rack-protection-1.5.3/lib/rack/protection/xss_header.rb:18:in `call'
...gems/1.9.1/gems/rack-protection-1.5.3/lib/rack/protection/path_traversal.rb:16:in `call'
...gems/1.9.1/gems/rack-protection-1.5.3/lib/rack/protection/json_csrf.rb:18:in `call'
...gems/1.9.1/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
...gems/1.9.1/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in `call'
...gems/1.9.1/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb:31:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/nulllogger.rb:9:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/head.rb:11:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:114:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:91:in `block in new'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/show_exceptions.rb:21:in `call'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/show_exceptions.rb:21:in `call'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:180:in `call'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:2014:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/urlmap.rb:65:in `block in call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/urlmap.rb:50:in `each'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/urlmap.rb:50:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/lint.rb:49:in `_call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/lint.rb:37:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/showexceptions.rb:24:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:114:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/commonlogger.rb:14:in `call'
...gems/1.9.1/gems/sinatra-1.4.5/lib/sinatra/base.rb:217:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:91:in `block in new'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/chunked.rb:43:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/chunked.rb:43:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:114:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:91:in `block in new'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/content_length.rb:14:in `call'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/content_length.rb:14:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:114:in `call'
...gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:91:in `block in new'
...gems/1.9.1/gems/thin-1.6.2/lib/thin/connection.rb:86:in `call'
...gems/1.9.1/gems/thin-1.6.2/lib/thin/connection.rb:86:in `block in pre_process'
...gems/1.9.1/gems/thin-1.6.2/lib/thin/connection.rb:84:in `catch'
...gems/1.9.1/gems/thin-1.6.2/lib/thin/connection.rb:84:in `pre_process'
...gems/1.9.1/gems/thin-1.6.2/lib/thin/connection.rb:53:in `process'
...gems/1.9.1/gems/thin-1.6.2/lib/thin/connection.rb:39:in `receive_data'
...gems/1.9.1/gems/eventmachine-1.0.3-x86-mingw32/lib/eventmachine.rb:187:in `run_machine'
...gems/1.9.1/gems/eventmachine-1.0.3-x86-mingw32/lib/eventmachine.rb:187:in `run'
...gems/1.9.1/gems/thin-1.6.2/lib/thin/backends/base.rb:73:in `start'
...gems/1.9.1/gems/thin-1.6.2/lib/thin/server.rb:162:in `start'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/handler/thin.rb:16:in `run'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:264:in `start'
...gems/1.9.1/gems/rack-1.5.2/lib/rack/server.rb:141:in `start'
...gems/1.9.1/gems/rack-1.5.2/bin/rackup:4:in `'
.../ruby/bin/rackup:23:in `load'
.../ruby/bin/rackup:23:in `'