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Re: How to start a server and a webservice at the same time?

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On Tue, 9 Aug 2011, Iain Adams wrote:

> I am building an application that requires both a Server/Client socket 
> connection to multiple clients AND also exposing multiple webservices.
>
> If I was to deploy my application on a Java container (JBoss/Tomcat etc) 
> is there a way I can get it to a) start the webservices and b) start the 
> server (so that it can listen on a specific port for incoming 
> connections)?

Yes.

For the web services, things are pretty simple. You can create a web 
service using JAX-WS, annotating an interface and a class with 
@WebService, then mapping the class as a servlet (even though it isn't 
really a servlet). Geronmio has a good example:

https://cwiki.apache.org/GMOxDOC20/simple-web-service-with-jax-ws.html

The container will then take care of binding the HTTP port, supplying 
handler threads, and so on.

The raw server socket is marginally trickier.

For a start, the J2EE specification specifically provides that most code 
in the container (including servlets and EJBs) might not be allowed to 
open a server socket or create a thread (that's supposed to the 
container's job!). The only code that is officially allowed to open a 
server socket is code which is part of a resource adapter; resource 
adapters also get access to thread pools. So, if you want to be 
squeaky-clean J2EE compliant, you will need to write a resource adapter; i 
have never done it, but my impression is that it is not a fun experience.

However, i think it's usually the case that opening server sockets and 
creating threads is actually allowed in all parts of the container (JBoss 
has never stopped me doing it, for example). So, your path of least 
resistance might be to commit the venial sin of deviation from the spec, 
and just set up your server in application code.

I would suggest staging your deviation in a servlet. You can write a 
servlet which will never actually handle a request, but whose init method 
binds a socket and starts a listener thread. You can then mark that 
servlet to be started on startup, by adding a load-on-startup element 
inside the servlet element in the web.xml.

I wouldn't suggest doing it in an EJB. Too much weird stuff going on.

tom

-- 
As Emiliano Zapata supposedly said, "Better to die on your feet than
live on your knees." And years after he died, Marlon Brando played him
in a movie. So just think, if you unionize, Marlon Brando might play
YOU in a movie. Even though he's dead. -- ChrisV82

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Thread

How to start a server and a webservice at the same time? Iain Adams <iain.adams.1985@gmail.com> - 2011-08-09 09:38 -0700
  Re: How to start a server and a webservice at the same time? Tom Anderson <twic@urchin.earth.li> - 2011-08-09 23:11 +0100
    Re: How to start a server and a webservice at the same time? Arne Vajhøj <arne@vajhoej.dk> - 2011-08-09 20:07 -0400
  Re: How to start a server and a webservice at the same time? Arne Vajhøj <arne@vajhoej.dk> - 2011-08-09 20:04 -0400

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