Your Kafka cluster is up, you're signed into Conduktor Desktop but you're getting an error when trying to connect to your Kafka cluster, why and what can you do?
You will see an error from the Conduktor Desktop Application which reads something like:
Couldn't connect to yourkafkaclusterhere:9092. You can check the logs for more details.
Further into the stack trace you will see an error which states:
Caused by: java.lang.IllegalArgumentException: JAAS config entry not terminated by semi-colon
Why does this happen?
This error means the configuration you have used to connect to your Kafka cluster from Conduktor Desktop is incorrect.
When it says your JAAS config entry is not terminated by semi-colon this can happen when you put a line break in your configuration to connect to your Kafka cluster, potentially from copy/pasting incorrectly.
An example of a good JAAS config seen as
sasl.jaas.config would be:
sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username="alice" password="alice-secret";
Here we can see the username is "alice" and the password is "alice-secret".
What to do?
1. Check your configuration, that there isnt an error with spaces or a line break and try to connect again.
2. If it looks ok, you can try connecting to Kafka using a different method from your machine. While it is likely to be an error with the entry of the configuration itself it can be helpful to check using a different method to see if you get a similar error from your configuration.
For example try using Telnet or netcat to check connectivity to the Kafka cluster is ok, if connection is ok you will see a "Connected to 188.8.131.52" .
An example using telnet:
Telnet host port
which could look like:
telnet 184.108.40.206 9092