Intellij is the preferred editor of most of the developers on Apache TomEE. It's fast and light and goes out of its way to guess what you're thinking and act accordingly in efforts to save you time and increase your enjoyment. In this regard TomEE and Intellij have a lot in common.
While TomEE works with most IDEs via the Tomcat adapter and this covers WAR files, JetBrains has stepped up to the plate with a TomEE specific adapter to allow deployment of the full range of archives that TomEE supports. The evolving TomEE/Intellij integration sets the pace for all other IDE integrations. Feature requests very welcome! TomEE is to Intellij what GlassFish is to NetBeans and your feedback is a critcal part of that.