Process not dying sample

gistfile1.java

import io.vertx.core.AbstractVerticle;
import io.vertx.core.Future;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class Server2 extends AbstractVerticle {
    private static final Logger logger = LoggerFactory.getLogger(Server2.class);

    @Override
    public void start(final Future<Void> onStartup) {
        try {
            // let's pretend there's a problem
            throw new RuntimeException("some problem");
        } catch (Exception e) {
            logger.error("start - failed ex:", e);
            onStartup.fail(e);
            vertx.close();
        }
    }
}