Is it necessary to close JAX-WS port?

In some tutorials (e.g. here, here and here) it is suggested to close the JAX-WS port by casting it to com.sun.xml.ws.Closeable e.g.

MyPortType port = MyService.getMyPort();
... do some operations on WS proxy ...
((com.sun.xml.ws.Closeable) port).close();

This approach will not work for proxies, returned by JaxWsPortProxyFactoryBean, as it advices only target WS interface and javax.xml.ws.BindingProvider.

So my question is: Is it necessary to close the port (taking in mind that it is re-usable in application)? If it is better to close the port (and probably nullify it?), how开发者_高级运维 to organize correctly lifecycle of ports (by implementation the created Spring proxies will always be singletons)?

The JavaDoc for com.sun.xml.ws.Closeable reads:

This signals the implementation of certain specs (like WS-ReliableMessaging and
WS-SecureConversation) to terminate sessions that they create during the life
time of a proxy object. This is not a mandatory operation, so the application
does not have to call this method.

Also Closing WSIT Reliable Messaging Connections note reads:

Calling close() method provides a way for WSIT components, such as Reliable
Messaging and Secure Conversations to do clean-up activities related to client
instance. Sometimes calling close() can be avoided without harmful effects.

No, I don't believe this is necessary. It is up to the JAX-WS subsystem to manage its own lifecycle, the ports need not be closed.

This is consist with the behaviour of JaxWsPortProxyFactoryBean, if you look at the source code. It does not attempt to do anything with the Port on context shutdown, which Spring FactoryBeans will generally do.