JAX-RS module is comparable to Web performance monitoring excepted it uses JAX-RS mapping instead of raw request url.
For instance you’ll get as counter name /user/{name} instead of /user/apache.
JAXRS integration comes with two main flavors: jaxrs2 and cxf.
The first one targets recent implementations and 100% relies on the specification. The second one is specific to cxf (it targets mainly cxf 2.6.x but should work with more recent releases). This is mainly for JAX-RS 1.0 servers.