I once asked in an iplanet newsgroup if there wasn't some way to take an EAR File that was produced by the Sun Reference Implementation of a
J2EE Server, and make it deployable on iPlanet, which was Suns J2EE Server that you would pay $$ for. There was no such tool. So it might be a little naive to assume there's a tool out there that converts from WAR to EAR in 1 easy click.
Having said that, app servers have come a long way since then (I made the complaint about 2 years ago), and IDE's have also caught up.
If you don't have the option of using Websphere application developer, there might be a way for netbeans to make an ear file for you. But that's more of a netbeans question.
So I'll move your
thread to the IDE forum for you.