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org.jruby.exceptions.RaiseException: (RuntimeError) Can't daemonize, no fork in JRuby.
        at LogStash::Agent.configure(file:/var/lib/logstash/logstash-1.0.17-monolithic.jar!/logstash/agent.rb:207)
        at LogStash::Agent.run(file:/var/lib/logstash/logstash-1.0.17-monolithic.jar!/logstash/agent.rb:242)	at logstash.runner.run(logstash/runner.rb:36)	at org.jruby.RubyProc.call(org/jruby/RubyProc.java:268)	at org.jruby.RubyProc.call(org/jruby/RubyProc.java:228)	at logstash.runner.run(logstash/runner.rb:53)	at logstash.runner.main(logstash/runner.rb:13)	at logstash.runner.(root)