Ok, I ended up doing it this way and it seems to work, please advise if there's a better way:
<bean id="WebServiceImpl" class="com.akimeka.ws.myDomain.MyWebService">
<beans:property name="jnpProviderUrl"
value="jnp://hostname.myDomain.com:1099" />
</bean>
<jaxws:endpoint
id=MyService
implementor='#WebServiceImpl'>
[...]
</jaxws:endpoint>
