Glassfish unable to deploy at root because default-web-module is declared

Question

While trying to deploy to Glassfish Server Open Source Edition 3.1.2.2 (build 5) from both Netbeans and Admin Console the following message is thro

Answer 1

The problem is due to the fact that glassfish assigns any newly deployed web module to all the available virtual servers except the _asadmin one. If any one of the servers already has a default web module assigned to it you will get this error. The solution is to login into your glassfish web admin navigate to configurations > server-config > Virtual Servers click on each of your virtual servers and remove the assigned default web modules. Deploy your application and then reassign each web module to its respective virtual server.