I have a large application that nolonger workes on the Application Server that it was originally written on. Is there a source of documentation that explains the following topics, for I am looking for a new app server.

How to manage a single registry over a set of machines. I run multiple instances of the app server on a single machine, or on multiple machines, depending upon the scenario.

How to manage multiple datasources in a set of instances. An instance might need two datasources to access the data to persist the beans.

How to use a Tomcat server on a machine remote from the app server. How the proxy's on the Tomcat server talks to the app server.

There is probably more, but if I could understand this, I would probably start the port.

Thanks