Unfortunately JAX-WS (Java API for XML Web Services) only works
directly with XML.... (anyone feel free to correct me if I'm
misinformed in this regard as I've never fully explored using JAX-WS
without XML)

You have a couple of options though...

If you want to stick with XML based web services you can go with using
Base64 encoded protocol buffer message(s) in appropriate XML fields.
Likewise you can return data this way.  The drawbacks of this are that
you're essentially throwing away a lot of the good that comes from web
services being well defined in terms of argument and return data
types. (Base64 is an encoding scheme for putting binary data in "human
readable" data streams such as XML by only using displayable
characters... encoding suffers a 4/3 size penalty as it takes four 6-
bit chars to encode three 8-bit bytes)

If you're more flexible you can implement a non-XML based web service
using a RESTful model, or thin HTTP requests, to post and get protocol
buffers directly as raw bytes.  There are also some "remoting"
services built on top of protocol buffers that act much like web
services.  I have not used any of them so I'll leave it to someone
more versed in those to speak to them.

If you want more info you can ask more questions or do a search on
RESTful web services (and yes JAX-WS supports "RESTful" but still
using XML...)

Best of luck,
Ben Wright

On Mar 31, 10:38 pm, Canggih PW <cangca...@gmail.com> wrote:
> hi,
> Sorry, i'm new in Java.
> Currently, i make a web service using python (for server) and java (for 
> client).
> Client-Server can updates data synchronously, i'm using long polling method. 
> All
> i know about how to implement those thing is using JAX WS, to send request and
> read the callback response. But, JAX WS using XML. How can i using protobuf in
> JAX-WS, or there are any other library in java that can do it?
> Thanks in advance
> Canggih

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