Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar 
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar 
java.lang.RuntimeException: Trying to unlisten to a channel that has no listeners in it.
	at samza.examples.wikipedia.system.WikipediaFeed.unlisten(WikipediaFeed.java:98)
	at samza.examples.wikipedia.system.WikipediaConsumer.stop(WikipediaConsumer.java:72)
	at org.apache.samza.system.SystemConsumers$$anonfun$stop$2.apply(SystemConsumers.scala:169)
	at org.apache.samza.system.SystemConsumers$$anonfun$stop$2.apply(SystemConsumers.scala:169)
	at scala.collection.Iterator$class.foreach(Iterator.scala:727)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
	at scala.collection.MapLike$DefaultValuesIterable.foreach(MapLike.scala:206)
	at org.apache.samza.system.SystemConsumers.stop(SystemConsumers.scala:169)
	at org.apache.samza.container.SamzaContainer.shutdownConsumers(SamzaContainer.scala:680)
	at org.apache.samza.container.SamzaContainer.run(SamzaContainer.scala:583)
	at org.apache.samza.container.SamzaContainer$.safeMain(SamzaContainer.scala:95)
	at org.apache.samza.container.SamzaContainer$.main(SamzaContainer.scala:69)
	at org.apache.samza.container.SamzaContainer.main(SamzaContainer.scala)
