I know that there are alot of mature open source Java web services frameworks out there (Axis, Spring WS, Metro). But are there any commercial alternatives? Unfortunately our company has a strict open source policy :(
We're trying to build a simple web service client that talks to a .net asmx web service.
If you don't want to use Service frameworks such as Axis 2, CXF, etc. Java 6 now supports JAX-WS 2 (JSR 224). Here's a tutorial (Introducing JAX-WS 2.0 With the Java SE 6 Platform) that shows you how to.
As for commercial, I don't really know any.
There aren't any. Fortunately, a web-service client is pretty easy to write from scratch if you understand the basics of HTTP and XML.
And if I were you, I'd start looking for another job.