ClassNotFoundException with Kafka Connect MQTT connector

Question

I am trying to subscribe to a mqtt topic with kafka connect, for this I used this connector: https://github.com/johanvandevenne/kafka-connect-mqtt . I followed the steps described there with a little modification and everything seemed to work. However, when I start the connector I get a ClassNotFoundException (screenshot) and the connector stops. It seems like it's coming from IMqttMessageListener but I don't know how to solve this.

Any ideas on what I can do?

This is my source file:

connector.class : be.jovacon.kafka.connect.MQTTSourceConnector
mqtt.broker : tcp://localhost:1883
mqtt.clientID: 1
mqtt.topic : test
kafka.topic: timestamp
key.converter:org.apache.kafka.connect.storage.StringConverter
key.converter.schemas.enable:false
value.converter:org.apache.kafka.connect.storage.StringConverter
value.converter.schemas.enable:false

Answer 1

You need to copy /target/kafka-connect-mqtt-1.0-0-package/share/kafka-connect-mqtt to your plugin.path where you can be found as a configuration in worker's configuration file .

Once you copy the JAR to your plugin.path , make sure to restart Kafka Connect .

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For more details about how to install Connect plugins, refer to Confluent's Documentation .

Answer 2

You need to copy all the 6 jars in the directory /kafka-connect-mqtt/target/kafka-connect-mqtt-1.1.0-package/kafka-connect-mqtt/. Your path is probably different from the one mentioned in the readme file for the repo that you are following.