A number of us have seen the exception below over the past few days. I've
opened this bug to track it, anyone know anything?
https://jira.opendaylight.org/browse/MDSAL-359

2018-07-01T12:46:34,544 | ERROR | SystemReadyService-0 | SystemReadyImpl
              | 278 - org.opendaylight.infrautils.ready-impl - 1.4.0 |
Failed unexpectedly (SystemReadyListeners are not called)
java.lang.NullPointerException: null
    at com.google.common.collect.Maps.doDifference(Maps.java:559) ~[?:?]
    at com.google.common.collect.Maps.difference(Maps.java:547) ~[?:?]
    at com.google.common.collect.Maps.difference(Maps.java:520) ~[?:?]
    at
org.opendaylight.mdsal.dom.broker.DOMRpcRouter$Registration.addRpc(DOMRpcRouter.java:202)
~[?:?]
    at
org.opendaylight.mdsal.dom.broker.DOMRpcRouter.notifyAdded(DOMRpcRouter.java:112)
~[?:?]
    at
org.opendaylight.mdsal.dom.broker.DOMRpcRouter.lambda$registerRpcImplementation$0(DOMRpcRouter.java:81)
~[?:?]
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:?]
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:?]
    at java.lang.Thread.run(Thread.java:748) [?:?]
2018-07-01T12:46:34,675 | ERROR | SystemReadyService-0 | SystemReadyImpl
              | 278 - org.opendaylight.infrautils.ready-impl - 1.4.0 |
Thread terminated due to uncaught exception: SystemReadyService-0
java.lang.NullPointerException: null
    at com.google.common.collect.Maps.doDifference(Maps.java:559) ~[?:?]
    at com.google.common.collect.Maps.difference(Maps.java:547) ~[?:?]
    at com.google.common.collect.Maps.difference(Maps.java:520) ~[?:?]
    at
org.opendaylight.mdsal.dom.broker.DOMRpcRouter$Registration.addRpc(DOMRpcRouter.java:202)
~[?:?]
    at
org.opendaylight.mdsal.dom.broker.DOMRpcRouter.notifyAdded(DOMRpcRouter.java:112)
~[?:?]
    at
org.opendaylight.mdsal.dom.broker.DOMRpcRouter.lambda$registerRpcImplementation$0(DOMRpcRouter.java:81)
~[?:?]
    at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:?]
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:?]
    at java.lang.Thread.run(Thread.java:748) [?:?]
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