Spring boot application with kafka stream - spring-boot

Question

Do anyone has a hello world example of reading message as stream using kafka stream and spring boot.
My kafka cluster is SASL_ SSL secured. So how do I connect my spring boot kafka stream application with. What to write in application.properties file.
I donot want to use spring cloud stream.
server.port=8084
topic.name=test-topic
server.servlet.context-path=/api/v1
spring.application.name=kafkatest
spring.kafka.bootstrap-servers=*************.com:9093
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.IntegerSerializer
spring.kafka.producer.value-serializer=io.confluent.kafka.serializers.KafkaAvroSerializer
spring.kafka.jaas.enabled=true
spring.kafka.properties.security.protocol= SASL_SSL
spring.kafka.properties.security.krb5.config = file:/etc/krb5.conf
spring.kafka.properties.sasl.mechanism = GSSAPI
spring.kafka.properties.sasl.kerberos.service.name= kafka
spring.kafka.properties.sasl.jaas.config = com.sun.security.auth.module.Krb5LoginModule required useTicketCache=false serviceName="kafka" storeKey=true principal="***************" useKeyTab=true keyTab="/home/api/config/kafkaclient.keytab";
spring.kafka.ssl.trust-store-location= file:/home/api/config/truststore.p12 spring.kafka.ssl.trust-store-password=*********************
spring.kafka.ssl.trust-store-type= PKCS12

Answer 1

I did this way.
Add the sasl config in the properties.
> spring:
> kafka:
> client-id: ${spring.app.name}
> bootstrap-servers: <cluster_url>:9092
> properties:
> ssl.endpoint.identification.algorithm: https
> sasl.mechanism: PLAIN
> sasl.jaas.config: org.apache.kafka.common.security.plain.PlainLoginModule required
> username="xxxxx" password="xxxxxxx";
> security.protocol: SASL_SSL
And then created a bean which initializes KafkaStreamsConfiguration
#Bean
public KafkaStreamsConfiguration streamsConfig(KafkaProperties kafkaProperties) {
Map<String, Object> streamsProperties = kafkaProperties.buildStreamsProperties();
streamsProperties.put(BOOTSTRAP_SERVERS_CONFIG, server);
streamsProperties.put(APPLICATION_ID_CONFIG, applicationId);
streamsProperties.put(DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
streamsProperties.put(DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
return new KafkaStreamsConfiguration(streamsProperties);
}
Note that: I'm using KafkaProperties.buildStreamsProperties() to fetch the streams config from properties