Local resources
- A Java text based interactive SQL tool.
- A simple utility Java application to recursively find a class name in jar files.
External resources
- The SOAP specification: it's pretty convoluted in some places but is a required read to understand the principles and ideas behind this protocol.
- The HTTP 1.1 RFC. While a web service is not required to run over HTTP, this is the most common way to do it. A good understanding of HTTP helps in debugging and generally in understanding web services.
- W3Schools: a collection of free HTML, CSS, JavaScript, DHTML, XML, XHTML, WAP, ASP, and SQL tutorials with lots of working examples and source code.