log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration debug="true" xmlns:log4j='http://jakarta.apache.org/log4j/'>

    <appender name="YOUR_KAFKA_APPENDER_NAME" class="kafka.producer.KafkaLog4jAppender">
        <param name="BrokerList" value="<host(s) to reach Kafka, like 'x.x.x.x:port, y.y.y.y:port'>"/>
        <param name="Threshold" value="DEBUG" />
        <param name="Category" value="your_selenium_testing" />
        <param name="Topic" value="your_selenium_testing" />
        <param name="Serializer" value="kafka.test.AppenderStringSerializer" />
    </appender>

    <category name="your_selenium_testing">
        <priority value="DEBUG" />
        <appender-ref ref="YOUR_KAFKA_APPENDER_NAME" />
    </category>

    <root>
        <level value="DEBUG" />
    </root>
</log4j:configuration>