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<dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
</dependency>

package com.perfect;

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.junit.jupiter.api.Test;

import java.util.Properties;

public class kafkaProducerTest {


    @Test
    public void sendmessagetest(){

        Properties props = new Properties();

        props.put("bootstrap.servers","localhost:9092");

        props.put("acks","all");

        props.put("retries",3);

        props.put("batch.size",16384);

        props.put("linger.ms",1);

        props.put("buffer.memory",33554432);

        props.put("key.serializer","org.apache.kafka.common.serialization.StringSerializer");

        props.put("value.serializer","org.apache.kafka.common.serialization.StringSerializer");

        KafkaProducer<String,String> p = new KafkaProducer<String, String>(props);

        for(int i = 0; i < 10; i++){
            p.send(new ProducerRecord<>("test1","message"+i));

        }

        p.close();
    }
}