title: kafka Unrecognized token 'Test': was expecting ('true', 'false' or 'null')
body: <p>in jhipster 5.3.4 i have started kafka with docker-compose </p>
  
  <pre><code>version: '2'
  services:
  zookeeper:
      image: wurstmeister/zookeeper:3.4.6
      #image: wurstmeister/zookeeper:latest
      ports:
        - 2181:2181
  kafka:
      image: wurstmeister/kafka:1.0.0
      #image: wurstmeister/kafka:latest
      environment:
          KAFKA_ADVERTISED_HOST_NAME: localhost
          KAFKA_ADVERTISED_PORT: 9092
          KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
          KAFKA_CREATE_TOPICS: "topic-jhipster:1:1"
      ports:
          - 9092:9092
  </code></pre>
  
  <p>One Gateway with kafka configuration producer,
  One microservice with kafka configuration consumer,
  all work fine, from gateway i can send messagge to consumer, but in consumer every minutes, i receive the following error in console:</p>
  
  <pre><code>[container-0-C-1] o.s.kafka.listener.LoggingErrorHandler   : Error while processing: ConsumerRecord(topic = topic-jhipster, partition = 0, offset = 44, CreateTime = 1537526418149, serialized key size = -1, serialized value size = 53, headers = RecordHeaders(headers = [RecordHeader(key = contentType, value = [123, 34, 116, 121, 112, 101, 34, 58, 34, 97, 112, 112, 108, 105, 99, 97, 116, 105, 111, 110, 34, 44, 34, 115, 117, 98, 116, 121, 112, 101, 34, 58, 34, 106, 115, 111, 110, 34, 44, 34, 112, 97, 114, 97, 109, 101, 116, 101, 114, 115, 34, 58, 123, 125, 44, 34, 99, 111, 110, 99, 114, 101, 116, 101, 34, 58, 116, 114, 117, 101, 44, 34, 119, 105, 108, 100, 99, 97, 114, 100, 84, 121, 112, 101, 34, 58, 102, 97, 108, 115, 101, 44, 34, 119, 105, 108, 100, 99, 97, 114, 100, 83, 117, 98, 116, 121, 112, 101, 34, 58, 102, 97, 108, 115, 101, 44, 34, 99, 104, 97, 114, 115, 101, 116, 34, 58, 110, 117, 108, 108, 125]), RecordHeader(key = spring_json_header_types, value = [123, 34, 99, 111, 110, 116, 101, 110, 116, 84, 121, 112, 101, 34, 58, 34, 111, 114, 103, 46, 115, 112, 114, 105, 110, 103, 102, 114, 97, 109, 101, 119, 111, 114, 107, 46, 117, 116, 105, 108, 46, 77, 105, 109, 101, 84, 121, 112, 101, 34, 125])], isReadOnly = false), key = null, value = [B@5b00f255)
  org.springframework.messaging.converter.MessageConversionException: Could not read JSON: Unrecognized token 'Test': was expecting ('true', 'false' or 'null')
  at [Source: (byte[])"Test message from gw1 sent at 2018-09-21T12:40:18.148"; line: 1, column: 6]; nested exception is com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'Test': was expecting ('true', 'false' or 'null')
  at [Source: (byte[])"Test message from gw1 sent at 2018-09-21T12:40:18.148"; line: 1, column: 6]
  at org.springframework.messaging.converter.MappingJackson2MessageConverter.convertFromInternal(MappingJackson2MessageConverter.java:235)
  at org.springframework.cloud.stream.converter.ApplicationJsonMessageMarshallingConverter.convertFromInternal(ApplicationJsonMessageMarshallingConverter.java:97)
  at org.springframework.messaging.converter.AbstractMessageConverter.fromMessage(AbstractMessageConverter.java:181)
  at org.springframework.messaging.converter.CompositeMessageConverter.fromMessage(CompositeMessageConverter.java:70)
  at org.springframework.messaging.handler.annotation.support.PayloadArgumentResolver.resolveArgument(PayloadArgumentResolver.java:137)
  at org.springframework.messaging.handler.invocation.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:116)
  at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:137)
  at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:109)
  at org.springframework.cloud.stream.binding.StreamListenerMessageHandler.handleRequestMessage(StreamListenerMessageHandler.java:55)
  at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:109)
  at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:158)
  at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
  at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:132)
  at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:105)
  at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:73)
  at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:445)
  at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:394)
  at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:181)
  at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:160)
  at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)
  at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:108)
  at org.springframework.integration.endpoint.MessageProducerSupport.sendMessage(MessageProducerSupport.java:203)
  at org.springframework.integration.kafka.inbound.KafkaMessageDrivenChannelAdapter.access$300(KafkaMessageDrivenChannelAdapter.java:70)
  at org.springframework.integration.kafka.inbound.KafkaMessageDrivenChannelAdapter$IntegrationRecordMessageListener.onMessage(KafkaMessageDrivenChannelAdapter.java:387)
  at org.springframework.integration.kafka.inbound.KafkaMessageDrivenChannelAdapter$IntegrationRecordMessageListener.onMessage(KafkaMessageDrivenChannelAdapter.java:364)
  at org.springframework.kafka.listener.adapter.RetryingMessageListenerAdapter.lambda$onMessage$0(RetryingMessageListenerAdapter.java:120)
  at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:287)
  at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:211)
  at org.springframework.kafka.listener.adapter.RetryingMessageListenerAdapter.onMessage(RetryingMessageListenerAdapter.java:114)
  at org.springframework.kafka.listener.adapter.RetryingMessageListenerAdapter.onMessage(RetryingMessageListenerAdapter.java:40)
  at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1077)
  at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeWithRecords(KafkaMessageListenerContainer.java:1057)
  at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeRecordListener(KafkaMessageListenerContainer.java:999)
  at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:867)
  at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:725)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  at java.lang.Thread.run(Thread.java:748)
  Caused by: com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'Test': was expecting ('true', 'false' or 'null')
   at [Source: (byte[])"Test message from gw1 sent at 2018-09-21T12:40:18.148"; line: 1, column: 6]
  at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1804)
  at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:679)
  at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidToken(UTF8StreamJsonParser.java:3526)
  at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._handleUnexpectedValue(UTF8StreamJsonParser.java:2621)
  at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._nextTokenNotInObject(UTF8StreamJsonParser.java:826)
  at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.nextToken(UTF8StreamJsonParser.java:723)
  at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4141)
  at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4000)
  at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3121)
  at org.springframework.messaging.converter.MappingJackson2MessageConverter.convertFromInternal(MappingJackson2MessageConverter.java:222)
  ... 37 common frames omitted
  </code></pre>