The environment variable rack.run_once does not get set properly.
Scenario:
Run a rack application from a config.ru file. The env variable does not contain an entry for rack.run_once.
Root cause
In the constructor of com.sun.grizzly.jruby.rack.DefaultRackApplication, the variable RubyString rack_run_once is initialized
to: runtime.newString("*rack.multiprocess*"). The value should be initialized to "rack.run_once" .
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