I have been working with JAX-WS 2.2.x recently and one of problem you might fact whilst playing with a client is that it uses more recent version of the JAX-WS API than that supplied with JDK 1.6. This shouldn't be a problem normally but there are some issues that might get in your way when using JDeveloper.
The first thing to note is that I am going to ignore the standard advice to user the java.endorsed.dirs system property as it can only specify a directory and not individual jar files. This is not always a problem; but if your jars are not packaged in a convenient way it means you have to move then to a new directory. Instead I am going for the slightly less standard -Xbootclasspath/p: property which prepends the jars to the boot classpath with much the same effect and I can specify the paths to individual jars. I will note with the screen grabs where you might go differently if you want to ignore this advice.
First things first you need to configure the compiler otherwise when you try to compile a web services client, in this case, you find error messages relating to the constructors on the Service class. You can find these settings under project properties. You could use the -endorsedpath here if you wish. For my purposes I had to place both the jax-xml-bind.jar and jax-xml-ws.jar on the bootclasspath. Of course use you platform specific path separator between the two paths. (If you are doing JAX-WS you are going to need the matching version of JAX-B)
Unfortunately you might find that this point that the project will fail to compile due to bug 12538161, there is a workaround which is to ask the compilation to happen as a separate process. This is going to be slightly slower; but in most cases you are not going to notice the difference.
Depending on your deployment context you might also like to update the run options for the your project, again I have used the bootclasspath but you could use the -Djava.endorsed.dirs depending on how you dependencies are laid out.
You can compile and run against the new API which will solve 99% of problem in the area. Fortunately only a few Java API's are packaged in this way. Hopefully in JDK 8 we can get the modularization sorted out so this sort of thing will be less of a problem.