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com.hazelcast.spi.exception.TargetDisconnectedException: java.lang.NullPointerException at com.hazelcast.client.spi.impl.ClientInvocationServiceSupport$CleanResourcesTask.notifyException(ClientInvocationServiceSupport.java:240) at com.hazelcast.client.spi.impl.ClientInvocationServiceSupport$CleanResourcesTask.run(ClientInvocationServiceSupport.java:225) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at com.hazelcast.util.executor.LoggingScheduledExecutor$LoggingDelegatingFuture.run(LoggingScheduledExecutor.java:128) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) at com.hazelcast.util.executor.HazelcastManagedThread.executeRun(HazelcastManagedThread.java:76) at com.hazelcast.util.executor.HazelcastManagedThread.run(HazelcastManagedThread.java:92)