OC4J does not have native support for JAX-WS, this complies up to the J2EE 1.4 specification. JAX-WS (which would be something like JAX-RPC 2.0) is a feature of Java EE 5, already included in Java SE 6 and above.
However, it is possible to have this feature in OC4J. This article provides some points to consider for the use of JAX-WS RI API.
See also: