I had some old Amazon Product Advertising API Client (now known as its Commerce API) code lying around that I have been meaning to Github. This client uses JAXB and REST (Commons HTTP Client) instead of JAXWS.

https://github.com/agentgt/JavaAmazonProductAdvertisingClient

A relevant stackoverflow post: http://stackoverflow.com/questions/2963168/amazon-products-api-library-for-java