I'm getting below exception in cache node and cluster went down.
###<Sep 9, 2017 10:51:35 PM EDT> <Notice> <StdErr> <> <> <Logger@9221436 12.1.2.0.0> <<WLS Kernel>> <> <> <1505011895527> <BEA-000000> <2017-09-09 22:51:35.526/3170.188 Oracle Coherence GE 12.1.2.0.0 <Error> (thread=DistributedCache:CCPtransformQueryCacheService, member=3): Unexpected exception occurred while calculating the partition assignment: java.lang.NullPointerException
at com.tangosol.net.partition.SimpleAssignmentStrategy.emitLossNotification(SimpleAssignmentStrategy.java:1245)
at com.tangosol.net.partition.SimpleAssignmentStrategy.analyzeOrphans(SimpleAssignmentStrategy.java:212)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService$CentralDistribution.reportOrphans(PartitionedService.CDB:14)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService.assignOrphans(PartitionedService.CDB:17)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService.onOwnershipRequestCompleted(PartitionedService.CDB:16)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService$OwnershipRequest$Poll.onCompletion(PartitionedService.CDB:26)
at com.tangosol.coherence.component.net.Poll.close(Poll.CDB:10)
at com.tangosol.coherence.component.net.Poll.onResponded(Poll.CDB:43)
at com.tangosol.coherence.component.net.Poll.onResponse(Poll.CDB:3)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService$OwnershipRequest$Poll.onResponse(PartitionedService.CDB:48)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onMessage(Grid.CDB:53)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:23)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService.onNotify(PartitionedService.CDB:3)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache.onNotify(PartitionedCache.CDB:3)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:51)
at java.lang.Thread.run(Thread.java:722)>