Oracle provide a useful Red Paper to configure JD Edwards Web Server into a cluster. But this means that you need a Weblogic Enterprise License. This license is not included into Oracle JD Edwards Technology Foundation. You will find attach to this topic this Red Paper but be careful about license consideration.
Another way to configure load balancing between Web Server, is to use an HTTP Server. You have the choice between Apache or Oracle HTTP Server. OHS is part of the Oracle Technology Foundation, it's a good alternative. You will find attach to this topic a red paper to configure Oracle HTTP Server.
For Apache, you only need plugins for Weblogic, and create a virtual host. If you need help on how to configure it, ask us to publish a tutorial