Unable to override lagom kafka parameters - apache-kafka

Question

I created a normal java project and put all dependencies of lagom kafka client on classpath , then in source folder i put the application.conf
Content of application.conf
lagom.broker.kafka {
service-name = ""
brokers = "127.0.0.1:9092"
}
while running the application service-name = "" should be used (so that my broker path could be used, rather than discovering), but it was not working
while debugging i found that in KafkaConfig class service-name comes out to be "kafka_native".
I found that while creating KafkaConfig , conf object which is coming dosen't have my application.conf in its origin
After this i tried overriding them using vm parameters like this:
-Dlagom.broker.kafka.service-name=""
-Dlagom.broker.kafka.brokers="127.0.0.1:9092"
-Dakka.kafka.consumer.kafka-clients.auto.offset.reset="earliest"
and it worked.
Can somebody explain why overriding in application conf not working
This is how i am subscribing to topic
import java.net.URI;
import java.util.concurrent.CompletableFuture;
import com.ameyo.ticketing.ticket.api.TicketingService;
import com.ameyo.ticketing.ticket.api.events.TicketEvent;
import com.lightbend.lagom.javadsl.api.broker.Topic;
import com.lightbend.lagom.javadsl.client.integration.LagomClientFactory;
import com.typesafe.config.ConfigFactory;
import akka.Done;
import akka.stream.javadsl.Flow;
/**
*
*/
public class Main {
public static void main(String[] args) {
String brokers = ConfigFactory.load().getString("lagom.broker.kafka.brokers");
System.out.println("Initial Value for Brokers " + brokers);
LagomClientFactory clientFactory = LagomClientFactory.create("legacy-system", Main.class.getClassLoader());
TicketingService ticketTingService = clientFactory.createClient(TicketingService.class,
URI.create("http://localhost:11000"));
Topic<TicketEvent> ticketEvents = ticketTingService.ticketEvents();
ticketEvents.subscribe().withGroupId("nya13").atLeastOnce(Flow.<TicketEvent> create().mapAsync(1, e -> {
System.out.println("kuch to aaya");
return CompletableFuture.completedFuture(Done.getInstance());
}));
try {
Thread.sleep(1000000000);
} catch (InterruptedException e1) {
}
}
}

Answer 1

Change configuration to
akka{
lagom.broker.kafka {
service-name = ""
brokers = "127.0.0.1:9092"
}
}
and it worked