log4j:WARN No appenders could be found for logger (org.apache.kafka.clients.producer.ProducerConfig)
log4j:WARN Please initialize the log4j system properly
It gets stuck on the first producer.send line, after the Test 1 sysout log. No exception gets thrown either, it just stops at printing out that Test 1 line. When I use Eclipse to debug it using line-breaks, it stops on that line as well, apparently with nothing happening. I also tried substituting localhost, 127.0.0.1 and even the external IP address of the node for the bootstrap.server properties.
The fast-messages and summary-markers directories in Kafka logs get created, but nothing written.