Vertx.deployVerticle does not call the supplied completion handler - vert.x

Question

I writing a service where a deployed verticle is linked to a rest endpoint. The service is working 100% (I dynamically deployed the verticle and calling the REST endpoint execute a function on the verticle). The problem is that the supplied completion handler is never called. Any ideas?
Following is my code:
LOGGER.debug(String.format("Starting runner %s:%s:%s" ,functionName, faasFunctionClass, fileName));
DeploymentOptions deploymentOptions = new DeploymentOptions();
deploymentOptions.setInstances(1);
JsonObject jsonObject = new JsonObject();
jsonObject.put(FUNCTION_NAME, functionName);
jsonObject.put(FUNCTION_CLASS, faasFunctionClass);
jsonObject.put(FUNCTION_FILENAME, fileName);
deploymentOptions.setConfig(jsonObject);
LOGGER.debug(String.format("Deploying [%s]" ,jsonObject.encode()));
this.vertx.deployVerticle("faas:" + VertxFaasRunner.class.getCanonicalName(),deploymentOptions, event->{
if (event.succeeded()) {
System.out.println("Deployment id is: " + event.result());
} else {
System.out.println("Deployment failed!");
}
});

Answer 1

In this case it depends on how you have implemented your Verticle.
in the below code when future.complete() is executed then only event.succeeded() will be true.
public class MainVerticle extends AbstractVerticle {
#Override
public void start() throws Exception {
System.out.println("[Main] Running in " + Thread.currentThread().getName());
vertx
.deployVerticle("io.vertx.example.core.verticle.worker.WorkerVerticle",
new DeploymentOptions().setWorker(true), event -> {
if (event.succeeded()) {
System.out.println("Deployment id is: " + event.result());
} else {
System.out.println("Deployment failed!");
}
});
}
}
public class WorkerVerticle extends AbstractVerticle {
#Override
public void start(Future future) throws Exception {
System.out.println("[Worker] Starting in " + Thread.currentThread().getName());
vertx.eventBus().<String>consumer("sample.data", message -> {
System.out.println("[Worker] Consuming data in " + Thread.currentThread().getName());
String body = message.body();
message.reply(body.toUpperCase());
});
// this notifies that the verticle is deployed successfully.
future.complete();
}
}