KafkaTemplate和SpringCloudStream混用导致stream发送消息出现序列化失败问题

org.springframework.messaging.MessageHandlingException: 
error occurred in message handler [org.springframework.cloud.stream.binder.kafka.KafkaMessageChannelBinder$ProducerConfigurationMessageHandler@673f700a]; 

nested exception is org.apache.kafka.common.errors.SerializationException: 
Can't convert value of class [B to class org.apache.kafka.common.serialization.StringSerializer specified in value.serializer

#kafka-producer配置，官网=>https://kafka.apache.org/documentation/#producerconfigs

  kafka:
    #集群地址
    bootstrap-servers: kafka:9092
    consumer:
      group-id: async-task-consumer-group
      auto-offset-reset: earliest
      enable-auto-commit: true
      auto-commit-interval: 1000
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
    producer:
      bootstrap-servers: kafka:9092
      # Spring Cloud Stream
      # key-serializer: org.apache.kafka.common.serialization.ByteArraySerializer
      # value-serializer: org.apache.kafka.common.serialization.ByteArraySerializer
      # 消息的键的序列化器
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      # 消息的值的序列化器
      value-serializer: org.apache.kafka.common.serialization.StringSerializer
      #发送确认机制:acks=all或-1：leader会等待所有ISR中的follower同步完成的ack才commit(保证ISR副本都有数据leader才commit，吞吐率降低),acks=0：partition leader不会等待任何ISR中副本的commit（可能会有数据丢失，吞吐高），acks=1 kafka会把这条消息写到本地日志文件中
      acks: all
      retries: 0
      #累计约1M条就发发送，必须小于缓冲区大小，否则报错无法分配内存（减少IO次数，过大则延时高，瞬间IO大）
      batch-size: 1024000
      #指定创建信息nio-buffer缓冲区大小约1M
      buffer-memory: 1024000
      properties:
        metadata:
          broker:
            list: kafka:9092
        #发送失败重试次数
        message:
          send:
            max:
              retries: 3
        
#默认0ms立即发送，不修改则上两条规则相当于无效（这个属性时个map列表，producer的其它配置也配置在这里，详细↑官网，这些配置会注入给KafkaProperties这个配置bean中，供#spring自动配置kafkaTemplate这个对象时使用）
        linger:
          ms: 1000
        ssl:
          client:
            auth: required

spring:
  cloud:
    stream:
      kafka:
        binder:
          brokers: kafka:9092
      bindings:
        test-input:
          destination: test-topic
          contentType: application/json
          group: test-group
          consumer:
            configuration:
              max:
                poll:
                  records: 10
        test-output:
          destination: test-topic
          contentType: application/json

key-serializer: org.apache.kafka.common.serialization.StringSerializer
value-serializer: org.apache.kafka.common.serialization.StringSerializer

stream:
  bindings:
    input:
      destination: input
      binder: kafka
    output:
      destination: input
      binder: kafka
  binders:
    kafka:
      type: kafka
      environment:
        spring.kafka:
          bootstrap-servers: ${spring.kafka.bootstrap-servers}

spring.cloud.stream.bindings.output.producer.use-native-encoding=true