This application is an example of a WSDL based stand-alone web service written in Java.

It uses the following technologies:

Java, XSD, Ant, WSDL, Jetty, MySQL (or other databases)

Here is what all those things mean:

• XSD is used to define a schema for model object as well as web service request and response transports (in the docroot folder)

• Ant build script uses JAXB to auto generate Java implementation for the model and transport objects (in the build folder)

• JAXB is also used to serialize and deserialize web service requests and responses.

• J2EE Servlet is used to generate a UI for an admin interface that returns HTML data for browser rendering. (Struts or other framework could be used for the admin)

• WSDL for defining the web service types, ports and operations. This file can be used to generate a Client SDK Proxy code.

• Jetty is used as an embedded web server that routes all requests and responses.

• MySQL is used as the database to store the data.

This application demonstrates a few interesting concepts:

• It produces a single Jar file that can be run as a stand-alone web service.

You could run as many of these stand alone web service instances as you would like on a single machine or on multiple servers with a load balancer in front of them.

• There is actually very little coding that had to be done in order to get this example running.

The definitions of the application models are in the schema files. 99% of the Java code is auto generated using Ant and JAXB. JAXB is also used to deserialize incoming requests and serialize outgoing responses using XML.

• It clearly demonstrates a 3-tier application structure: Request/Response Facade, Model objects and DAO objects.