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serializer error with Kafka 1.0.0

See original GitHub issue

I tried wordcount example with Elmhurst.BUILD-SNAPSHOT and kafka 1.0.0 and getting serializer error. wonder if I had to supply different serializer in application.yml ! please advise.

How to reproduce

https://github.com/xmlking/klogs

2017-12-22 20:46:45.248  INFO 19884 --- [-StreamThread-1] org.apache.kafka.streams.KafkaStreams    : stream-client [default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62]State transition from REBALANCING to RUNNING
2017-12-22 20:46:46.144 ERROR 19884 --- [-StreamThread-1] o.a.k.s.p.i.ProcessorStateManager        : task [1_0] Failed to flush state store WordCounts: 

org.apache.kafka.streams.errors.StreamsException: A serializer (key: org.apache.kafka.common.serialization.StringSerializer / value: org.apache.kafka.common.serialization.StringSerializer) is not compatible to the actual key or value type (key type: unknown because key is null / value type: [B). Change the default Serdes in StreamConfig or provide correct Serdes via method parameters.
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:91) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMapValues$KStreamMapProcessor.process(KStreamMapValues.java:41) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.ForwardingCacheFlushListener.apply(ForwardingCacheFlushListener.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.maybeForward(CachingWindowStore.java:115) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.access$300(CachingWindowStore.java:36) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore$1.apply(CachingWindowStore.java:99) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:141) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:99) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.ThreadCache.flush(ThreadCache.java:127) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.flush(CachingWindowStore.java:132) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.MeteredWindowStore.flush(MeteredWindowStore.java:128) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:245) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AbstractTask.flushState(AbstractTask.java:196) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.flushState(StreamTask.java:324) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask$1.run(StreamTask.java:304) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:299) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:289) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks$2.apply(AssignedTasks.java:87) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks.applyToRunningTasks(AssignedTasks.java:451) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks.commit(AssignedTasks.java:380) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.TaskManager.commitAll(TaskManager.java:309) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.maybeCommit(StreamThread.java:1018) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:835) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:774) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:744) [kafka-streams-1.0.0.jar:na]
Caused by: java.lang.ClassCastException: [B cannot be cast to java.lang.String
        at org.apache.kafka.common.serialization.StringSerializer.serialize(StringSerializer.java:28) ~[kafka-clients-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:91) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:78) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:87) ~[kafka-streams-1.0.0.jar:na]
        ... 50 common frames omitted

2017-12-22 20:46:46.144 ERROR 19884 --- [-StreamThread-1] o.a.k.s.p.internals.AssignedTasks        : stream-thread [default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62-StreamThread-1] Failed to commit stream task 1_0 due to the following error:

org.apache.kafka.streams.errors.ProcessorStateException: task [1_0] Failed to flush state store WordCounts
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:248) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AbstractTask.flushState(AbstractTask.java:196) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.flushState(StreamTask.java:324) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask$1.run(StreamTask.java:304) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:299) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:289) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks$2.apply(AssignedTasks.java:87) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks.applyToRunningTasks(AssignedTasks.java:451) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks.commit(AssignedTasks.java:380) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.TaskManager.commitAll(TaskManager.java:309) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.maybeCommit(StreamThread.java:1018) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:835) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:774) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:744) [kafka-streams-1.0.0.jar:na]
Caused by: org.apache.kafka.streams.errors.StreamsException: A serializer (key: org.apache.kafka.common.serialization.StringSerializer / value: org.apache.kafka.common.serialization.StringSerializer) is not compatible to the actual key or value type (key type: unknown because key is null / value type: [B). Change the default Serdes in StreamConfig or provide correct Serdes via method parameters.
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:91) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMapValues$KStreamMapProcessor.process(KStreamMapValues.java:41) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.ForwardingCacheFlushListener.apply(ForwardingCacheFlushListener.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.maybeForward(CachingWindowStore.java:115) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.access$300(CachingWindowStore.java:36) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore$1.apply(CachingWindowStore.java:99) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:141) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:99) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.ThreadCache.flush(ThreadCache.java:127) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.flush(CachingWindowStore.java:132) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.MeteredWindowStore.flush(MeteredWindowStore.java:128) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:245) ~[kafka-streams-1.0.0.jar:na]
        ... 14 common frames omitted
Caused by: java.lang.ClassCastException: [B cannot be cast to java.lang.String
        at org.apache.kafka.common.serialization.StringSerializer.serialize(StringSerializer.java:28) ~[kafka-clients-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:91) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:78) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:87) ~[kafka-streams-1.0.0.jar:na]
        ... 50 common frames omitted

2017-12-22 20:46:46.150  INFO 19884 --- [-StreamThread-1] o.a.k.clients.producer.KafkaProducer     : [Producer clientId=default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62-StreamThread-1-producer] Closing the Kafka producer with timeoutMillis = 9223372036854775807 ms.
2017-12-22 20:46:46.156  INFO 19884 --- [-StreamThread-1] org.apache.kafka.streams.KafkaStreams    : stream-client [default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62]State transition from RUNNING to ERROR
2017-12-22 20:46:46.156  WARN 19884 --- [-StreamThread-1] org.apache.kafka.streams.KafkaStreams    : stream-client [default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62]All stream threads have died. The instance will be in error state and should be closed.
Exception in thread "default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62-StreamThread-1" org.apache.kafka.streams.errors.ProcessorStateException: task [1_0] Failed to flush state store WordCounts
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:248)
        at org.apache.kafka.streams.processor.internals.AbstractTask.flushState(AbstractTask.java:196)
        at org.apache.kafka.streams.processor.internals.StreamTask.flushState(StreamTask.java:324)
        at org.apache.kafka.streams.processor.internals.StreamTask$1.run(StreamTask.java:304)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:299)
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:289)
        at org.apache.kafka.streams.processor.internals.AssignedTasks$2.apply(AssignedTasks.java:87)
        at org.apache.kafka.streams.processor.internals.AssignedTasks.applyToRunningTasks(AssignedTasks.java:451)
        at org.apache.kafka.streams.processor.internals.AssignedTasks.commit(AssignedTasks.java:380)
        at org.apache.kafka.streams.processor.internals.TaskManager.commitAll(TaskManager.java:309)
        at org.apache.kafka.streams.processor.internals.StreamThread.maybeCommit(StreamThread.java:1018)
        at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:835)
        at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:774)
        at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:744)
Caused by: org.apache.kafka.streams.errors.StreamsException: A serializer (key: org.apache.kafka.common.serialization.StringSerializer / value: org.apache.kafka.common.serialization.StringSerializer) is not compatible to the actual key or value type (key type: unknown because key is null / value type: [B). Change the default Serdes in StreamConfig or provide correct Serdes via method parameters.
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:91)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMapValues$KStreamMapProcessor.process(KStreamMapValues.java:41)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.ForwardingCacheFlushListener.apply(ForwardingCacheFlushListener.java:42)
        at org.apache.kafka.streams.state.internals.CachingWindowStore.maybeForward(CachingWindowStore.java:115)
        at org.apache.kafka.streams.state.internals.CachingWindowStore.access$300(CachingWindowStore.java:36)
        at org.apache.kafka.streams.state.internals.CachingWindowStore$1.apply(CachingWindowStore.java:99)
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:141)
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:99)
        at org.apache.kafka.streams.state.internals.ThreadCache.flush(ThreadCache.java:127)
        at org.apache.kafka.streams.state.internals.CachingWindowStore.flush(CachingWindowStore.java:132)
        at org.apache.kafka.streams.state.internals.MeteredWindowStore.flush(MeteredWindowStore.java:128)
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:245)
        ... 14 more
Caused by: java.lang.ClassCastException: [B cannot be cast to java.lang.String
        at org.apache.kafka.common.serialization.StringSerializer.serialize(StringSerializer.java:28)
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:91)
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:78)
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:87)
        ... 50 more
2017-12-22 20:46:45.248  INFO 19884 --- [-StreamThread-1] org.apache.kafka.streams.KafkaStreams    : stream-client [default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62]State transition from REBALANCING to RUNNING
2017-12-22 20:46:46.144 ERROR 19884 --- [-StreamThread-1] o.a.k.s.p.i.ProcessorStateManager        : task [1_0] Failed to flush state store WordCounts: 

org.apache.kafka.streams.errors.StreamsException: A serializer (key: org.apache.kafka.common.serialization.StringSerializer / value: org.apache.kafka.common.serialization.StringSerializer) is not compatible to the actual key or value type (key type: unknown because key is null / value type: [B). Change the default Serdes in StreamConfig or provide correct Serdes via method parameters.
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:91) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMapValues$KStreamMapProcessor.process(KStreamMapValues.java:41) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.ForwardingCacheFlushListener.apply(ForwardingCacheFlushListener.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.maybeForward(CachingWindowStore.java:115) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.access$300(CachingWindowStore.java:36) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore$1.apply(CachingWindowStore.java:99) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:141) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:99) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.ThreadCache.flush(ThreadCache.java:127) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.flush(CachingWindowStore.java:132) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.MeteredWindowStore.flush(MeteredWindowStore.java:128) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:245) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AbstractTask.flushState(AbstractTask.java:196) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.flushState(StreamTask.java:324) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask$1.run(StreamTask.java:304) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:299) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:289) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks$2.apply(AssignedTasks.java:87) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks.applyToRunningTasks(AssignedTasks.java:451) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks.commit(AssignedTasks.java:380) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.TaskManager.commitAll(TaskManager.java:309) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.maybeCommit(StreamThread.java:1018) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:835) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:774) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:744) [kafka-streams-1.0.0.jar:na]
Caused by: java.lang.ClassCastException: [B cannot be cast to java.lang.String
        at org.apache.kafka.common.serialization.StringSerializer.serialize(StringSerializer.java:28) ~[kafka-clients-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:91) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:78) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:87) ~[kafka-streams-1.0.0.jar:na]
        ... 50 common frames omitted

2017-12-22 20:46:46.144 ERROR 19884 --- [-StreamThread-1] o.a.k.s.p.internals.AssignedTasks        : stream-thread [default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62-StreamThread-1] Failed to commit stream task 1_0 due to the following error:

org.apache.kafka.streams.errors.ProcessorStateException: task [1_0] Failed to flush state store WordCounts
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:248) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AbstractTask.flushState(AbstractTask.java:196) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.flushState(StreamTask.java:324) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask$1.run(StreamTask.java:304) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:299) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:289) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks$2.apply(AssignedTasks.java:87) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks.applyToRunningTasks(AssignedTasks.java:451) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.AssignedTasks.commit(AssignedTasks.java:380) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.TaskManager.commitAll(TaskManager.java:309) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.maybeCommit(StreamThread.java:1018) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:835) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:774) [kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:744) [kafka-streams-1.0.0.jar:na]
Caused by: org.apache.kafka.streams.errors.StreamsException: A serializer (key: org.apache.kafka.common.serialization.StringSerializer / value: org.apache.kafka.common.serialization.StringSerializer) is not compatible to the actual key or value type (key type: unknown because key is null / value type: [B). Change the default Serdes in StreamConfig or provide correct Serdes via method parameters.
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:91) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.KStreamMapValues$KStreamMapProcessor.process(KStreamMapValues.java:41) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.kstream.internals.ForwardingCacheFlushListener.apply(ForwardingCacheFlushListener.java:42) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.maybeForward(CachingWindowStore.java:115) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.access$300(CachingWindowStore.java:36) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore$1.apply(CachingWindowStore.java:99) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:141) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:99) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.ThreadCache.flush(ThreadCache.java:127) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.CachingWindowStore.flush(CachingWindowStore.java:132) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.state.internals.MeteredWindowStore.flush(MeteredWindowStore.java:128) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:245) ~[kafka-streams-1.0.0.jar:na]
        ... 14 common frames omitted
Caused by: java.lang.ClassCastException: [B cannot be cast to java.lang.String
        at org.apache.kafka.common.serialization.StringSerializer.serialize(StringSerializer.java:28) ~[kafka-clients-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:91) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:78) ~[kafka-streams-1.0.0.jar:na]
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:87) ~[kafka-streams-1.0.0.jar:na]
        ... 50 common frames omitted

2017-12-22 20:46:46.150  INFO 19884 --- [-StreamThread-1] o.a.k.clients.producer.KafkaProducer     : [Producer clientId=default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62-StreamThread-1-producer] Closing the Kafka producer with timeoutMillis = 9223372036854775807 ms.
2017-12-22 20:46:46.156  INFO 19884 --- [-StreamThread-1] org.apache.kafka.streams.KafkaStreams    : stream-client [default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62]State transition from RUNNING to ERROR
2017-12-22 20:46:46.156  WARN 19884 --- [-StreamThread-1] org.apache.kafka.streams.KafkaStreams    : stream-client [default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62]All stream threads have died. The instance will be in error state and should be closed.
Exception in thread "default-e98e0795-9c60-4f4c-9ff6-e7bb6a14ea62-StreamThread-1" org.apache.kafka.streams.errors.ProcessorStateException: task [1_0] Failed to flush state store WordCounts
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:248)
        at org.apache.kafka.streams.processor.internals.AbstractTask.flushState(AbstractTask.java:196)
        at org.apache.kafka.streams.processor.internals.StreamTask.flushState(StreamTask.java:324)
        at org.apache.kafka.streams.processor.internals.StreamTask$1.run(StreamTask.java:304)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:299)
        at org.apache.kafka.streams.processor.internals.StreamTask.commit(StreamTask.java:289)
        at org.apache.kafka.streams.processor.internals.AssignedTasks$2.apply(AssignedTasks.java:87)
        at org.apache.kafka.streams.processor.internals.AssignedTasks.applyToRunningTasks(AssignedTasks.java:451)
        at org.apache.kafka.streams.processor.internals.AssignedTasks.commit(AssignedTasks.java:380)
        at org.apache.kafka.streams.processor.internals.TaskManager.commitAll(TaskManager.java:309)
        at org.apache.kafka.streams.processor.internals.StreamThread.maybeCommit(StreamThread.java:1018)
        at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:835)
        at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:774)
        at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:744)
Caused by: org.apache.kafka.streams.errors.StreamsException: A serializer (key: org.apache.kafka.common.serialization.StringSerializer / value: org.apache.kafka.common.serialization.StringSerializer) is not compatible to the actual key or value type (key type: unknown because key is null / value type: [B). Change the default Serdes in StreamConfig or provide correct Serdes via method parameters.
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:91)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMap$KStreamMapProcessor.process(KStreamMap.java:42)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.KStreamMapValues$KStreamMapProcessor.process(KStreamMapValues.java:41)
        at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
        at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
        at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
        at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:85)
        at org.apache.kafka.streams.kstream.internals.ForwardingCacheFlushListener.apply(ForwardingCacheFlushListener.java:42)
        at org.apache.kafka.streams.state.internals.CachingWindowStore.maybeForward(CachingWindowStore.java:115)
        at org.apache.kafka.streams.state.internals.CachingWindowStore.access$300(CachingWindowStore.java:36)
        at org.apache.kafka.streams.state.internals.CachingWindowStore$1.apply(CachingWindowStore.java:99)
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:141)
        at org.apache.kafka.streams.state.internals.NamedCache.flush(NamedCache.java:99)
        at org.apache.kafka.streams.state.internals.ThreadCache.flush(ThreadCache.java:127)
        at org.apache.kafka.streams.state.internals.CachingWindowStore.flush(CachingWindowStore.java:132)
        at org.apache.kafka.streams.state.internals.MeteredWindowStore.flush(MeteredWindowStore.java:128)
        at org.apache.kafka.streams.processor.internals.ProcessorStateManager.flush(ProcessorStateManager.java:245)
        ... 14 more
Caused by: java.lang.ClassCastException: [B cannot be cast to java.lang.String
        at org.apache.kafka.common.serialization.StringSerializer.serialize(StringSerializer.java:28)
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:91)
        at org.apache.kafka.streams.processor.internals.RecordCollectorImpl.send(RecordCollectorImpl.java:78)
        at org.apache.kafka.streams.processor.internals.SinkNode.process(SinkNode.java:87)
        ... 50 more

Issue Analytics

  • State:closed
  • Created 6 years ago
  • Comments:11 (6 by maintainers)

github_iconTop GitHub Comments

1reaction
sobychackocommented, Dec 29, 2017

@xmlking In a different issue related to this one, I said that you cannot currently override the application.id. Actually, you can override that by providing the following property. spring.cloud.stream.kstream.binder.configuration.application.id. Sorry for the confusion.

1reaction
garyrussellcommented, Dec 28, 2017

my only requirement is support for Kafka 1.0.0, as my team want to use Kafka 1.0.0.

spring-kafka 1.3.2.RELEASE (since 1.3.1) supports the Kafka 1.0.0 client and embedded broker; this is compatible with boot 1.5.9.

You can use the spring-cloud-stream-binder-kafka11 1.3.0.RELEASE with Ditmars.SR1; you just have to override all the kafka dependencies (SK, SIK, kafka-clients - and kafka scala jars for the embedded server).

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