Yes I am using it with no issues. Since Errai/GWT is mostly a client side technology you can use it with any web container unless you are using WebSockets, JAX-RS, JPA, etc. In that case you will need a JavaEE compliant container. If you need to use GWT source maps the web container should be able to hot deploy local file modifications. I startup my application using WildFly swarm and when needed start the codeserver maven plugin, access the code server URL, enable debug mode, and then debug/update my Errai application.