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Old version gave in logs ... 2019-06-06T09:34:46,730 | WARN | FlowRuleDriverProvider-0 | FlowRuleDriverProvider | 191 - org.onosproject.onos-core-net - 2.2.0.SNAPSHOT | Exception thrown while polling netconf:172.26.138.38:830 java.lang.NullPointerException: null at org.onosproject.drivers.juniper.FlowRuleJuniperImpl.getFlowEntries(FlowRuleJuniperImpl.java:92) ~[?:?] at org.onosproject.net.flow.impl.FlowRuleDriverProvider.pollDeviceFlowEntries(FlowRuleDriverProvider.java:193) ~[?:?] at org.onosproject.net.flow.impl.FlowRuleDriverProvider.access$500(FlowRuleDriverProvider.java:63) ~[?:?] at org.onosproject.net.flow.impl.FlowRuleDriverProvider$InternalDeviceListener.handleEvent(FlowRuleDriverProvider.java:249) ~[?:?] at org.onosproject.net.flow.impl.FlowRuleDriverProvider$InternalDeviceListener.lambda$event$0(FlowRuleDriverProvider.java:233) ~[?:?] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:?] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:?] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:?] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:?] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:?] at java.lang.Thread.run(Thread.java:745) [?:?] New version gives ... 2019-06-07T09:36:07,924 | WARN | FlowRuleDriverProvider-0 | JuniperAbstractHandlerBehaviour | 218 - org.onosproject.onos-drivers-juniper - 2.2.0.SNAPSHOT | NETCONF session to device netconf:172.26.138.68:830 not yet established, will be retried Note in new version this lookup code refactored to be in one place. Change-Id: Ic78c5ecc67e8e98d14da845d0541d980296750a5