@ori_iro, thats strange - theres nothing Kafka related in the stacktrace, which I’d expect to see.
The sink and source connector share the same jar, so I don’t know what is happening here to prevent it being loaded for one and not the other.
There is a lot of jetty / jersey code is the error coming from a web UI? Also the error doesn’t appear related to the initial decode error - has that been fixed?
Finally, in the 1.6.0 release the jar packages were updated so now the mongo-kafka-connect-1.6.0-all.jar contain all the dependencies, which are needed for non confluent kafka connect implementations. It also includes the avro dependencies as well as the driver. Does updating it to use the mongo-kafka-connect-1.6.0-all.jar work?
Ross