In addition to my impressions of the JUGC evening about TomEE, Vaadin, Linkki and Arquillian, some of the speakers provided me slides and other documentation or links to it.
This demo revolves around the MyBatis JPetStore 6 on Apache TomEE. It includes several examples on how to add EE technoligies to an existing legacy application. The slides are included in the project as odf and pdf. https://github.com/tomitribe/tomcat_to_tomee
The Arquillian Testing Framework demo project provides multiple examples. The slides are included in the project as odf and pdf. https://github.com/AndyGee/arquillian-demo
Project link mentioned in my blog