java.lang.NullPointerException

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    • java.lang.NullPointerException at java.util.Objects.requireNonNull(Objects.java:203)[?:1.8.0_101] at org.graylog2.shared.system.activities.Activity.<init>(Activity.java:34)[graylog.jar:?] at org.graylog2.inputs.InputStateListener.inputStateChanged(InputStateListener.java:57)[graylog.jar:?] at sun.reflect.GeneratedMethodAccessor120.invoke(Unknown Source)[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[?:1.8.0_101] at java.lang.reflect.Method.invoke(Method.java:498)[?:1.8.0_101] at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:95)[graylog.jar:?] at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:154)[graylog.jar:?] at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:80)[graylog.jar:?] at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)[graylog.jar:?] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[?:1.8.0_101] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[?:1.8.0_101] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_101]

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