You deploy Play apps inside an application container (like JBoss, Tomcat, Jetty, etc...)
Vert.x is based on Netty and thus it is not running on an application container.
I'd say that Vert.x or Netty based apps are more safer - from this point of view, but there may be some other kind of vulnerabilities for them..
Also, it's important to note that the owner of the VPS instance didn't took proper precautions: "I overlooked the deployment of the web console and HTTP Invoker and I paid for that". If you go by the book and do everything right JBoss and other application containers are safe to use.
You deploy Play apps inside an application container (like JBoss, Tomcat, Jetty, etc...)
Vert.x is based on Netty and thus it is not running on an application container.
I'd say that Vert.x or Netty based apps are more safer - from this point of view, but there may be some other kind of vulnerabilities for them..
Also, it's important to note that the owner of the VPS instance didn't took proper precautions: "I overlooked the deployment of the web console and HTTP Invoker and I paid for that". If you go by the book and do everything right JBoss and other application containers are safe to use.