Thanks for the reply.
I had hoped to just tell the Build dialog about the .jar and then be able to use the methods in it, just like I do with JDBC. None of these external methods I am using refer to any GWT functions.
On a hunch, I added an "inherits" line in the Login8.gwt.xml file that gave the full name of my MySQL class. When I attempt to compile the Login8.java code, it fails with an error that it is unable to find the gwt.xml file for the MySQL class.
I have been over the documentation that I could find. It would be far more helpful to point me to a specific section than just an overly broad suggestion to just RTFM. Based on the entries I can find with Google about "gwt error external jar", this is a very common problem and the sheer volume should be proof that it is an issue that needs to be addressed with concrete examples and explanations that are easy to find. Either that or it shows a function that needs to be added to the Eclipse plugin. Having the customer resorting to unproven third-party web sites for unsupported code hacks because he can't find the answer where it should be easily found is not satisfactory.
I found this site to be somewhat helpful, but after adapting my application to it, I am still failing to compile: http://www.vogella.de/articles/GWT/ar01s07.html
I have no idea if this site is telling me the truth or leading me astray.
I have set up a workspace with just the example test classes and gwt code. I changed the name slightly as this was an entirely new workspace. I would be happy to upload it somewhere for someone to look at. This is a simple and generic test case. It would make a great HOWTO for anyone who would point out what needs to be fixed or added. I am dead in the water right now.