I would suggest an empty item since that is what you see when you have no runtime.

When you add a runtime to a runtime-less server, you cannot remove it again --------------------------------------------------------------------------- Key: JBIDE-17621 URL: https://issues.jboss.org/browse/JBIDE-17621 Project: Tools (JBoss Tools) Issue Type: Bug Components: server, upstream Affects Versions: 4.2.0.Beta2 Reporter: Martin Malina Assignee: Rob Stryker Fix For: 4.2.0.CR1 When you create a remote server without a runtime and then open the server editor and click the runtime drop down menu, a suitable runtime will be selected. But once you do that, you can no longer revert that action (once you save the editor). Clearly, there needs to be a new item in the drop down menu called <none> or something similar. Credit for spotting this bug goes to [~ljelinko] ;)