Mongo kafka 连接器，解串器问题

Question

I am using kafka connect in order to read data from mongo and write them to kafka topic. I am using the mongo kafka source connector. The message coming to my listener throws following exception when i am trying to deserializer.

(although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value

why is the above error?

Answer 1

my connectors had org.apache.kafka.connect.json.JsonConverter instead of org.apache.kafka.connect.storage.StringConverter This solved the problem.

Also in the spring when initializing the JsonDeserializer pass in the custom objectMapper for example like below

objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); objectMapper.registerModule(new JavaTimeModule());

hope this helps someone