As a user, I cannot create two hosts with unspecified default web module. Currently the default-web-module is checked only for uniqueness and by default there is defined ROOT.war, which by default doesn't exist. Current behavior is that in case of non existing module defined by default-web-module, when accessing the root context ('/'), the content defined as part of welcome-file handler is provided.

As a user I should not be forced to put random values to avoid duplicity check, when I don't want to have set default-web-module. As such the default-web-module should have undefined default which could be checked and avoided failures due duplicates as there are in reality none.