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Short for "Java API for XML Web Services version 2.0," JAX-WS 2.0 is a key part of the Java Web Services Development Pack, and it offers simplified architecture for developing Web services. Its main features include the following:

• An API for developing Java- and XML-based Web services
• A standard implementation of the Web services servlet
• Annotations which the annotation processing tool (apt) uses to generate components for the service and client
• Wsimport and other tools for generating beans, stubs, and XML for the client code

Source link

Introducing JAX-WS 2.0 with the Java SE 6 Platform, Part 1

Further Reading

DevX article on JAX-WS 2.0