Useful to know if you want to download the source for debugging purposes. Take a look at the following path:
For example you might see a file named "glassfish.jaxws.rt_2.1.3.jar". This tells you that we are using 2.1.3 of JAX-WS (src). On my machine using internal builds I get "glassfish.jaxws.rt_126.96.36.199_2-1-4.jar" which tells me that I am using a patched version of the 2.1.4 build of JAX-WS (src). The latter might differ slightly from the published source; but probably not enough to worry about.