Here's a small example demonstrating how to convert JSON to XML using JAXB data binding. You might want to use this over streaming where you want to operate on objects in an intermediary step. It is possible to perform the reverse operation but that is not demonstrated here.
JAX-WS is built into Java 6. This makes it a low-dependency choice for writing SOAP-based web service code. This post covers the basics of JAX-WS development with a sample web service.
An understanding of the following is beneficial: Servlets; XML Schema Definition (XSD); Web Services Description Langauge (WSDL); XPath; JAXB.
Server code was tested on Glassfish 3; client code was tested on Java 6.
The code here describes a contract-first web service; it is possible to do this the other way round, starting with Java code and generating descriptors from it.
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