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null at org.apache.cassandra.service.CacheService$KeyCacheSerializer .serialize(CacheService.java:475) ~[apache-cassandra-2.1.0.jar:2.1.0] at org.apache.cassandra.service.CacheService$KeyCacheSerializer .serialize(CacheService.java:463) ~[apache-cassandra-2.1.0.jar:2.1.0]
java.lang.NullPointerException: null at org.apache.cassandra.service.CacheService$KeyCacheSerializer .serialize(CacheService.java:475) ~[apache-cassandra-2.1.0.jar:2.1.0] at org.apache.cassandra.service.CacheService$KeyCacheSerializer .serialize(CacheService.java:463) ~[apache-cassandra-2.1.0.jar:2.1.0] at org.apache.cassandra.cache.AutoSavingCache$Writer.saveCache(AutoSavingCache.java:225)[apache-cassandra-2.1.0.jar:2.1.0] at org.apache.cassandra.db.compaction.CompactionManager$11.run(CompactionManager.java:1061)[apache-cassandra-2.1.0.jar:2.1.0] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)[na:1.7.0_80] at java.util.concurrent.FutureTask.run(Unknown Source)[na:1.7.0_80] at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)[na:1.7.0_80] at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)[na:1.7.0_80] at java.lang.Thread.run(Unknown Source)[na:1.7.0_80]