This week's book giveaways are in the Jython/Python and Object-Oriented programming forums. We're giving away four copies each of Machine Learning for Business: Using Amazon SageMaker and Jupyter and Object Design Style Guide and have the authors on-line! See this thread and this one for details.
We currently use XML Beans in a production application. We are experimenting with GWT to take our app to the web for the GUI. Can these two technologies work together or will the 1.4 JVM keep us from using XML Beans?
I don't know much about XML Beans, in fact I only heard about the project for the first time only two weeks ago. I am guessing the issue you foresee is that you are using Java 5 annotations, correct?
A lot of people have been running into this issue, and some other related issues. One of the tools that keeps coming up is Dozer (http://dozer.sourceforge.net/). Dozer uses a mapping file to copy data from one bean to another. This is less than ideal because you will ave two sets of beans, but it should work.
On the other hand, Java 5 support is pretty high priority, and likely to be in the next big release. Probably by the fall.