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http://www.igniterealtime.org/community/message/190515;jsessionid=48FA6DAFED3454D7E577B13B9DDB5239
This should be probably documented somewhere in the documentation of Spark.
http://www.igniterealtime.org/community/message/190515;jsessionid=48FA6DAFED3454D7E577B13B9DDB5239