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at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.run(OperationThread.java:110) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.process(OperationThread.java:123) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.process(OperationThread.java:153) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:413) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:197) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.call(OperationRunnerImpl.java:222) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.executor.impl.operations.AbstractCallableTaskOperation$OffloadImpl.start(AbstractCallableTaskOperation.java:98) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.executor.impl.operations.AbstractCallableTaskOperation$OffloadImpl.loadCallable(AbstractCallableTaskOperation.java:106) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.internal.serialization.impl.AbstractSerializationService.toObject(AbstractSerializationService.java:187) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.read(StreamSerializerAdapter.java:48) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.internal.serialization.impl.JavaDefaultSerializers$JavaSerializer.read(JavaDefaultSerializers.java:75) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.internal.serialization.impl.JavaDefaultSerializers$JavaSerializer.read(JavaDefaultSerializers.java:82) ~[hazelcast-3.11.1.jar!/:?] 
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431) ~[?:1.8.0_201] 
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573) ~[?:1.8.0_201] 
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2069) ~[?:1.8.0_201] 
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2211) ~[?:1.8.0_201] 
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2287) ~[?:1.8.0_201] 
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573) ~[?:1.8.0_201] 
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2042) ~[?:1.8.0_201] 
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1751) ~[?:1.8.0_201] 
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1868) ~[?:1.8.0_201] 
at com.hazelcast.nio.IOUtil$ClassLoaderAwareObjectInputStream.resolveClass(IOUtil.java:646) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.nio.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:252) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.nio.ClassLoaderUtil.tryLoadClass(ClassLoaderUtil.java:288) ~[hazelcast-3.11.1.jar!/:?] 
at org.jivesoftware.openfire.plugin.util.cache.ClusterClassLoader.loadClass(ClusterClassLoader.java:94) ~[hazelcast-2.4.0.jar!/:?] 
Caused by: java.lang.ClassNotFoundException: org.jivesoftware.openfire.reporting.stats.GetStatistics 
... 10 more 
at com.hazelcast.spi.impl.operationservice.impl.InvocationFuture.resolveAndThrowIfException(InvocationFuture.java:79) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationservice.impl.InvocationFuture.resolve(InvocationFuture.java:127) ~[hazelcast-3.11.1.jar!/:?] 
at ------ submitted from ------.(Unknown Source) ~[?:?] 
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.run(OperationThread.java:110) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.process(OperationThread.java:123) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.process(OperationThread.java:153) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:413) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:197) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.call(OperationRunnerImpl.java:222) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.executor.impl.operations.AbstractCallableTaskOperation$OffloadImpl.start(AbstractCallableTaskOperation.java:98) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.executor.impl.operations.AbstractCallableTaskOperation$OffloadImpl.loadCallable(AbstractCallableTaskOperation.java:106) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.internal.serialization.impl.AbstractSerializationService.toObject(AbstractSerializationService.java:187) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.read(StreamSerializerAdapter.java:48) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.internal.serialization.impl.JavaDefaultSerializers$JavaSerializer.read(JavaDefaultSerializers.java:75) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.internal.serialization.impl.JavaDefaultSerializers$JavaSerializer.read(JavaDefaultSerializers.java:86) ~[hazelcast-3.11.1.jar!/:?] 
Caused by: com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: org.jivesoftware.openfire.reporting.stats.GetStatistics 
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201] 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_201] 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_201] 
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_201] 
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_201] 
at org.jivesoftware.openfire.reporting.stats.StatsEngine$SampleTask.run(StatsEngine.java:324) [monitoring-1.7.0.jar!/:?] 
at org.jivesoftware.util.cache.CacheFactory.doSynchronousClusterTask(CacheFactory.java:666) [xmppserver-4.3.1.jar:4.3.1] 
at org.jivesoftware.openfire.plugin.util.cache.ClusteredCacheFactory.doSynchronousClusterTask(ClusteredCacheFactory.java:399) [hazelcast-2.4.0.jar!/:?] 
at com.hazelcast.util.executor.DelegatingFuture.get(DelegatingFuture.java:88) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.AbstractInvocationFuture.get(AbstractInvocationFuture.java:190) ~[hazelcast-3.11.1.jar!/:?] 
at com.hazelcast.spi.impl.operationservice.impl.InvocationFuture.resolveAndThrowIfException(InvocationFuture.java:92) ~[hazelcast-3.11.1.jar!/:?] 
java.util.concurrent.ExecutionException: com.hazelcast.nio.serialization.HazelcastSerializationException: java.lang.ClassNotFoundException: org.jivesoftware.openfire.reporting.stats.GetStatistics 
2019.02.28 07:18:21 org.jivesoftware.openfire.plugin.util.cache.ClusteredCacheFactory - Failed to execute cluster task