Apache Kafka example error: Failed to send message after 3 tries

Question

I am running this kafka producer example mentioned in its site

The code:

public class TestProducer {

    public static void main(String[] args) {
               


        

Answer 1

I got these errors when running a Kafka producer:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

Found a solution:

On my Mac box, after I download the scala-2.10 and kafka_2.10-0.8.1, in the kafka_2.10-0.8.1 directory, every thing is fine when I start zookeeper, kafka server, and create a test topic. Then I need to start a producer for the test topic. but there is an error:

yhuangMac:kafka_2.10-0.8.1 yhuang$ ./bin/kafka-console-producer.sh –broker-list localhost:9092 –topic test
SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”.
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

The reason is that in the kafka libs directory, the kafka release zip file only included jar file of slf4j-api, they missed a jar file: slf4j-nop.jar, so we have to go to http://www.slf4j.org, download slf4j-1.7.7.zip, and then unzip it, copy the slf4j-api-1.7.7, slf4j-nop-1.7.7.jar into kafka’s libs directory.

Restart kafka producer again, now no error is reported.

Source: SOLUTION