This is a follow-up of JBIDE-19799.

In Eclipse > preferences > Server > Runtime Environments > Default Classpath Entries
you can add new classpath entries. For AS7 and newer servers, the main mechanism is using JBoss Modules.

So when you choose your server type and then Add -> JBoss Module, in the dialog, there is a field called Module ID. In JBIDE-19799, a possibility was added to show suggestions based on what you start typing - it's using content assist.

Would it be possible to start suggesting right away, i.e. without using Ctrl+space? Content Assist is not really something one would expect in a dialog, so it may be a bit counter-intuitive.