No serviceName defined in either JAAS or Kafka config (not Kerberos)

I'm trying to configure a kafka client to authenticate against a secure kafkaserver. I've set up the jaas and ssl configs, but it's complaining about serviceNames.

I am not using Kerberos.

command

KAFKA_OPTS="-Djava.security.auth.login.config=./jaas.conf" \ 
kafka-console-producer --broker-list k0:9092,k1:9092,k2:9092 \
   --topic test-topic 
   --producer.config ./ssl.properties

error

org.apache.kafka.common.KafkaException: Failed to construct kafka producer
    at org.apache.kafka.clients.producer.KafkaProducer.<init>
    [ ... ] 
Caused by: java.lang.IllegalArgumentException: No serviceName defined in either JAAS or Kafka config

jaas.conf

KafkaServer {
    org.apache.kafka.common.security.plain.PlainLoginModule required
    serviceName="kafka"
    password="broker-secret"
    user_broker="broker-secret"
    sasl.enabled.mechanisms=PLAIN
    sasl.mechanism.inter.broker.protocol=PLAIN
    confluent.metrics.reporter.sasl.mechanism=PLAIN
    user_username1="password1";
};

ssl.properties

bootstrap.servers=k0:9092,k1:9092,k2:9092
security.protocol=SASL_PLAINTEXT
ssl.truststore.location=/var/ssl/private/client.truststore.jks
ssl.truststore.password=confluent
ssl.keystore.location=/var/ssl/private/client.keystore.jks
ssl.keystore.password=confluent
ssl.key.password=confluent


producer.bootstrap.servers=k0:9092,1:9092,k2:9092
producer.security.protocol=SASL_PLAINTEXT
producer.ssl.truststore.location=/var/private/ssl/kafka.client.truststore.jks
producer.ssl.truststore.location=/var/ssl/private/client.truststore.jks
producer.ssl.truststore.password=confluent
producer.ssl.keystore.location=/var/ssl/private/client.keystore.jks
producer.ssl.keystore.password=confluent
producer.ssl.key.password=confluent

org.apache.kafka.common.security.plain.PlainLoginModule required
password="broker-secret"
user_broker="broker-secret"
sasl.enabled.mechanisms=PLAIN
sasl.mechanism.inter.broker.protocol=PLAIN
confluent.metrics.reporter.sasl.mechanism=PLAIN
user_username1="password";
serviceName="Kafka"

This error indicates that jaas configuration is not visible to your kafka producer. To solve this issue, you either need to include

sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username="(username)" password="(password)";

in your ssl.properties file, or export it in your path

export KAFKA_OPTS="-Djava.security.auth.login.config=path/to/jaas.conf"