Apache Kafka: …StringDeserializer is not an instance of …Deserializer

Question

In my simple application i am trying to instantiate a KafkaConsumer my code is nearly a copy of the code from javadoc (\"Automatic Offset Committing\"):

@Slf4j
p         


        

Answer 1

Not sure if this is what finally fixed your error, but note that when using spring-kafka-test (version 2.1.x, starting with version 2.1.5) with the 1.1.x kafka-clients jar, you will need to override certain transitive dependencies as follows:

    org.springframework.kafka
    spring-kafka
    ${spring.kafka.version}



    org.springframework.kafka
    spring-kafka-test
    ${spring.kafka.version}
    test



    org.apache.kafka
    kafka-clients
    1.1.1



    org.apache.kafka
    kafka-clients
    1.1.1
    test



    org.apache.kafka
    kafka_2.11
    1.1.1
    test



    org.apache.kafka
    kafka_2.11
    1.1.1
    test
    test

so it could've been a problem with your transitive dependency for sure