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Failed to serialize 'com.hazelcast.map.impl.operation.EntryOperation'
java.util.ConcurrentModificationException: null	at java.util.ArrayList.writeObject(Unknown Source)	at sun.reflect.GeneratedMethodAccessor143.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeObject(Unknown Source)	at java.util.ArrayList.writeObject(Unknown Source)	at sun.reflect.GeneratedMethodAccessor143.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)	at java.io.ObjectOutputStream.writeObject0(Unknown Source)	at java.io.ObjectOutputStream.writeObject(Unknown Source)	at com.hazelcast.internal.serialization.impl.JavaDefaultSerializers$JavaSerializer.write(JavaDefaultSerializers.java:242)	at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.write(StreamSerializerAdapter.java:41)	at com.hazelcast.internal.serialization.impl.AbstractSerializationService.writeObject(AbstractSerializationService.java:199)	at com.hazelcast.internal.serialization.impl.ByteArrayObjectDataOutput.writeObject(ByteArrayObjectDataOutput.java:371)	at com.hazelcast.map.impl.operation.PartitionWideEntryBackupOperation.writeInternal(PartitionWideEntryBackupOperation.java:98)	at com.hazelcast.map.impl.operation.PartitionWideEntryWithPredicateBackupOperation.writeInternal(PartitionWideEntryWithPredicateBackupOperation.java:51)	at com.hazelcast.spi.Operation.writeData(Operation.java:472)	at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.write(DataSerializableSerializer.java:161)	at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.write(DataSerializableSerializer.java:52)	at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.write(StreamSerializerAdapter.java:41)	at com.hazelcast.internal.serialization.impl.AbstractSerializationService.writeObject(AbstractSerializationService.java:199)	at com.hazelcast.internal.serialization.impl.ByteArrayObjectDataOutput.writeObject(ByteArrayObjectDataOutput.java:371)	at com.hazelcast.spi.impl.operationservice.impl.operations.Backup.writeInternal(Backup.java:222)	at com.hazelcast.spi.Operation.writeData(Operation.java:472)	at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.write(DataSerializableSerializer.java:161)	at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.write(DataSerializableSerializer.java:52)	at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.write(StreamSerializerAdapter.java:41)	at com.hazelcast.internal.serialization.impl.AbstractSerializationService.toBytes(AbstractSerializationService.java:140)	at com.hazelcast.internal.serialization.impl.AbstractSerializationService.toBytes(AbstractSerializationService.java:124)	at com.hazelcast.spi.impl.operationservice.impl.OperationServiceImpl.send(OperationServiceImpl.java:406)	at com.hazelcast.spi.impl.operationservice.impl.OperationBackupHandler.sendSingleBackup(OperationBackupHandler.java:187)	at com.hazelcast.spi.impl.operationservice.impl.OperationBackupHandler.makeBackups(OperationBackupHandler.java:159)	at com.hazelcast.spi.impl.operationservice.impl.OperationBackupHandler.backup(OperationBackupHandler.java:78)	at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.sendBackup(OperationRunnerImpl.java:270)	at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.handleResponse(OperationRunnerImpl.java:253)	at com.hazelcast.spi.impl.operationservice.impl.OperationRunnerImpl.run(OperationRunnerImpl.java:182)	at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.process(OperationThread.java:122)	at com.hazelcast.spi.impl.operationexecutor.impl.OperationThread.run(OperationThread.java:102)